organic compounds
of (1-ethoxyethylidene)dimethylazanium tetraphenylborate
aFakultät Chemie/Organische Chemie, Hochschule Aalen, Beethovenstrasse 1, D-73430 Aalen, Germany
*Correspondence e-mail: willi.kantlehner@hs-aalen.de
In the cation of the title salt, C6H14NO+·C24H20B−, the C—N bond lengths are 1.297 (2), 1.464 (2) and 1.468 (2) Å, indicating double- and single-bond character, respectively. The C—O bond length of 1.309 (2) Å shows double-bond character, pointing towards charge delocalization within the NCO plane of the iminium ion. In the crystal, C—H⋯π interactions between the iminium H atoms and the phenyl C atoms of the anion are present. The phenyl rings form aromatic pockets, in which the iminium ions are embedded.
Keywords: crystal structure; (ethoxyethylidene)dimethylazanium; tetraphenylborate; salt; C—H⋯π interactions.
CCDC reference: 1437994
1. Related literature
For acetalization reactions with carboxamide-dialkyl sulfate adducts, see: Kantlehner et al. (1980). For the of (methoxymethylidene)dimethylazanium tetraphenylborate acetonitrile monosolvate, see: Tiritiris et al. (2014a). For the of (butoxymethylidene)dimethylazanium tetraphenylborate acetonitrile monosolvate, see: Tiritiris et al. (2014b). For the of (ethoxyethylidene)dimethylazanium ethyl sulfate, see: Tiritiris et al. (2015). For the analysis of alkali metal tetraphenylborates, see: Behrens et al. (2012). For the use of intensity quotients and differences in see: Parsons et al. (2013).
2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: APEX2 (Bruker, 2008); cell SAINT (Bruker, 2008); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: SHELXL2014.
Supporting information
CCDC reference: 1437994
https://doi.org/10.1107/S2056989015022252/zl2652sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989015022252/zl2652Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S2056989015022252/zl2652Isup3.cml
The title compound was obtained by
reaction. 1.00 g (3.66 mmol) of (ethoxyethylidene)dimethylazanium ethyl sulfate (Tiritiris et al., 2015) was dissolved in 20 ml acetonitrile and 1.25 g (3.66 mmol) of sodium tetraphenylborate in 20 ml acetonitrile was added. After stirring for one hour at room temperature, the precipitated sodium ethyl sulfate was filtered off. The title compound crystallized from a saturated acetonitrile solution after several hours at 273 K, forming colorless single crystals. Yield: 1.35 g (85%).The title compound crystallizes in the non-centrosymmetric
P212121; however, in the absence of significant effects, the determined x = -0.2 (4) (Parsons et al., 2013) is essentially meaningless. The hydrogen atoms of the methyl groups were allowed to rotate with a fixed angle around the C–N and C–C bonds to best fit the experimental electron density, with Uiso(H) set to 1.5 Ueq(C) and d(C—H) = 0.98 Å. The remaining H atoms were placed in calculated positions with d(C—H) = 0.99 Å (H atoms in CH2 groups) and (C—H) = 0.95 Å (H atoms in aromatic rings). They were refined using a riding model, with Uiso(H) set to 1.2Ueq(C).Carboxamide-dialkyl sulfate adducts are salts that can be used for acetalization reactions (Kantlehner et al., 1980). The 1:1 adduct of N,N-dimethylacetamide and diethyl sulfate, known as (ethoxyethylidene)dimethylazanium ethyl sulfate (Tiritiris et al., 2015) is one of them. By reaction with sodium tetraphenylborate in acetonitrile, it was possible to achieve an π interactions between the iminium hydrogen atoms of –N(CH3)2 and –CH2 groups and the phenyl carbon atoms (centroids: Cg1 = C7—C12, Cg2 = C13—C18 and Cg3 = C25—C30) of the tetraphenylborate ion are present (Fig. 2), ranging from 2.67 to 2.72 Å (Tab. 1). Such a type of interactions were also observed in the iminium salts (methoxymethylidene)dimethylazanium tetraphenylborate acetonitrile monosolvate (Tiritiris et al., 2014a) and (butoxymethylidene)dimethylazanium tetraphenylborate acetonitrile monosolvate (Tiritiris et al., 2014b). The phenyl rings form aromatic pockets, in which the guanidinium ions are embedded.
and to obtain the title compound. The structure analysis reveals that the bond lengths and angles in the cation are in very good agreement with the data obtained from the structure analysis of (ethoxyethylidene)dimethylazanium ethyl sulfate (Tiritiris et al., 2015). In the tetraphenylborate salt, the C5–N1 bond length is 1.468 (2) Å, C6–N1 = 1.464 (2) Å and C1–N1 = 1.297 (2) Å, showing single and double bond character, respectively. The C–N1–C angles are: 115.24 (12)° (C5–N1–C6), 122.11 (13)° (C1–N1–C5) and 122.65 (13)° (C1–N1–C6), which indicates a nearly trigonal-planar surrounding of the nitrogen centre by the carbon atoms (Fig. 1). The C–O bond length shows with 1.309 (2) Å double bond character. The positive charge is completely delocalized on the plane formed by the atoms N1, C1 and O1 (Fig. 1). The C3–O1 bond length of 1.471 (2) Å is indicating single bond character. The bond lengths and angles in the tetraphenylborate ions are in good agreement with the data from the analysis of the alkali metal tetraphenylborates (Behrens et al., 2012). C–H···For acetalization reactions with carboxamide-dialkyl sulfate adducts, see: Kantlehner et al. (1980). For the
of (methoxymethylidene)dimethylazanium tetraphenylborate acetonitrile monosolvate, see: Tiritiris et al. (2014a). For the of (butoxymethylidene)dimethylazanium tetraphenylborate acetonitrile monosolvate, see: Tiritiris et al. (2014b). For the of (ethoxyethylidene)dimethylazanium ethyl sulfate, see: Tiritiris et al. (2015). For the analysis of alkali metal tetraphenylborates, see: Behrens et al. (2012). The title compound crystallizes in a non-centrosymmetric however, in the absence of significant effects, the determined x = -0.2 (4) (Parsons et al., 2013) is essentially meaningless.Data collection: APEX2 (Bruker, 2008); cell
SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015); molecular graphics: DIAMOND (Brandenburg & Putz, 2005); software used to prepare material for publication: SHELXL2014 (Sheldrick, 2015).C6H14NO+·C24H20B− | F(000) = 936 |
Mr = 435.39 | Dx = 1.185 Mg m−3 |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 6826 reflections |
a = 9.9849 (6) Å | θ = 2.0–30.6° |
b = 11.5293 (7) Å | µ = 0.07 mm−1 |
c = 21.1980 (12) Å | T = 100 K |
V = 2440.3 (3) Å3 | Block, colorless |
Z = 4 | 0.54 × 0.39 × 0.18 mm |
Bruker Kappa APEXII DUO diffractometer | 7520 independent reflections |
Radiation source: fine-focus sealed tube | 6825 reflections with I > 2σ(I) |
Triumph monochromator | Rint = 0.029 |
φ scans, and ω scans | θmax = 30.6°, θmin = 1.9° |
Absorption correction: multi-scan (Blessing, 1995) | h = −14→14 |
Tmin = 0.726, Tmax = 0.746 | k = −16→16 |
33864 measured reflections | l = −27→30 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.037 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.095 | H-atom parameters constrained |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0527P)2 + 0.3379P] where P = (Fo2 + 2Fc2)/3 |
7520 reflections | (Δ/σ)max < 0.001 |
302 parameters | Δρmax = 0.25 e Å−3 |
0 restraints | Δρmin = −0.23 e Å−3 |
C6H14NO+·C24H20B− | V = 2440.3 (3) Å3 |
Mr = 435.39 | Z = 4 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 9.9849 (6) Å | µ = 0.07 mm−1 |
b = 11.5293 (7) Å | T = 100 K |
c = 21.1980 (12) Å | 0.54 × 0.39 × 0.18 mm |
Bruker Kappa APEXII DUO diffractometer | 7520 independent reflections |
Absorption correction: multi-scan (Blessing, 1995) | 6825 reflections with I > 2σ(I) |
Tmin = 0.726, Tmax = 0.746 | Rint = 0.029 |
33864 measured reflections |
R[F2 > 2σ(F2)] = 0.037 | 0 restraints |
wR(F2) = 0.095 | H-atom parameters constrained |
S = 1.03 | Δρmax = 0.25 e Å−3 |
7520 reflections | Δρmin = −0.23 e Å−3 |
302 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
O1 | 0.30998 (11) | 0.52467 (9) | 0.12549 (5) | 0.0192 (2) | |
C1 | 0.21195 (15) | 0.59672 (13) | 0.11353 (7) | 0.0165 (3) | |
N1 | 0.21207 (12) | 0.69225 (11) | 0.14580 (6) | 0.0165 (2) | |
C2 | 0.10847 (17) | 0.57082 (16) | 0.06546 (7) | 0.0233 (3) | |
H2A | 0.0346 | 0.5281 | 0.0851 | 0.035* | |
H2B | 0.1479 | 0.5237 | 0.0318 | 0.035* | |
H2C | 0.0745 | 0.6436 | 0.0477 | 0.035* | |
C3 | 0.31599 (17) | 0.41096 (13) | 0.09413 (7) | 0.0210 (3) | |
H3A | 0.3350 | 0.4204 | 0.0486 | 0.025* | |
H3B | 0.2299 | 0.3693 | 0.0989 | 0.025* | |
C4 | 0.42626 (19) | 0.34548 (14) | 0.12555 (9) | 0.0269 (3) | |
H4A | 0.5109 | 0.3873 | 0.1200 | 0.040* | |
H4B | 0.4337 | 0.2682 | 0.1066 | 0.040* | |
H4C | 0.4067 | 0.3379 | 0.1707 | 0.040* | |
C5 | 0.10603 (17) | 0.77963 (15) | 0.13914 (8) | 0.0238 (3) | |
H5A | 0.1223 | 0.8259 | 0.1011 | 0.036* | |
H5B | 0.1060 | 0.8305 | 0.1762 | 0.036* | |
H5C | 0.0190 | 0.7408 | 0.1357 | 0.036* | |
C6 | 0.31634 (16) | 0.72012 (13) | 0.19196 (7) | 0.0210 (3) | |
H6A | 0.2801 | 0.7118 | 0.2347 | 0.031* | |
H6B | 0.3466 | 0.8001 | 0.1856 | 0.031* | |
H6C | 0.3922 | 0.6671 | 0.1865 | 0.031* | |
B1 | 0.74360 (16) | 0.96058 (13) | 0.13424 (7) | 0.0134 (3) | |
C7 | 0.81051 (14) | 1.07099 (12) | 0.09675 (6) | 0.0144 (2) | |
C8 | 0.74193 (16) | 1.17297 (13) | 0.08187 (7) | 0.0185 (3) | |
H8 | 0.6496 | 1.1784 | 0.0923 | 0.022* | |
C9 | 0.80315 (18) | 1.26719 (13) | 0.05239 (7) | 0.0224 (3) | |
H9 | 0.7524 | 1.3349 | 0.0435 | 0.027* | |
C10 | 0.93698 (18) | 1.26280 (14) | 0.03606 (7) | 0.0222 (3) | |
H10 | 0.9785 | 1.3261 | 0.0151 | 0.027* | |
C11 | 1.00906 (16) | 1.16413 (14) | 0.05094 (7) | 0.0212 (3) | |
H11 | 1.1016 | 1.1600 | 0.0408 | 0.025* | |
C12 | 0.94734 (15) | 1.07112 (13) | 0.08062 (7) | 0.0175 (3) | |
H12 | 0.9996 | 1.0047 | 0.0905 | 0.021* | |
C13 | 0.83345 (14) | 0.93481 (12) | 0.19804 (6) | 0.0137 (2) | |
C14 | 0.91903 (14) | 1.01811 (13) | 0.22415 (7) | 0.0160 (3) | |
H14 | 0.9228 | 1.0927 | 0.2052 | 0.019* | |
C15 | 0.99888 (15) | 0.99624 (15) | 0.27663 (7) | 0.0198 (3) | |
H15 | 1.0568 | 1.0550 | 0.2922 | 0.024* | |
C16 | 0.99417 (16) | 0.88928 (15) | 0.30619 (7) | 0.0213 (3) | |
H16 | 1.0504 | 0.8729 | 0.3412 | 0.026* | |
C17 | 0.90577 (16) | 0.80661 (14) | 0.28360 (7) | 0.0204 (3) | |
H17 | 0.8984 | 0.7340 | 0.3044 | 0.024* | |
C18 | 0.82782 (15) | 0.82896 (13) | 0.23073 (7) | 0.0168 (3) | |
H18 | 0.7684 | 0.7704 | 0.2161 | 0.020* | |
C19 | 0.74159 (14) | 0.84278 (12) | 0.09026 (6) | 0.0150 (3) | |
C20 | 0.82655 (15) | 0.82106 (13) | 0.03890 (6) | 0.0175 (3) | |
H20 | 0.8890 | 0.8791 | 0.0268 | 0.021* | |
C21 | 0.82289 (18) | 0.71751 (14) | 0.00481 (7) | 0.0220 (3) | |
H21 | 0.8823 | 0.7065 | −0.0297 | 0.026* | |
C22 | 0.73336 (19) | 0.63092 (15) | 0.02089 (8) | 0.0257 (3) | |
H22 | 0.7312 | 0.5601 | −0.0020 | 0.031* | |
C23 | 0.64692 (18) | 0.64933 (14) | 0.07098 (8) | 0.0262 (3) | |
H23 | 0.5842 | 0.5911 | 0.0825 | 0.031* | |
C24 | 0.65189 (16) | 0.75297 (13) | 0.10442 (7) | 0.0204 (3) | |
H24 | 0.5915 | 0.7634 | 0.1386 | 0.025* | |
C25 | 0.58849 (14) | 0.98927 (12) | 0.15445 (6) | 0.0140 (2) | |
C26 | 0.54660 (14) | 1.00130 (13) | 0.21695 (7) | 0.0174 (3) | |
H26 | 0.6106 | 0.9916 | 0.2497 | 0.021* | |
C27 | 0.41480 (16) | 1.02689 (14) | 0.23328 (7) | 0.0214 (3) | |
H27 | 0.3906 | 1.0341 | 0.2765 | 0.026* | |
C28 | 0.31913 (15) | 1.04184 (13) | 0.18703 (8) | 0.0210 (3) | |
H28 | 0.2293 | 1.0601 | 0.1979 | 0.025* | |
C29 | 0.35655 (15) | 1.02972 (13) | 0.12432 (8) | 0.0192 (3) | |
H29 | 0.2919 | 1.0395 | 0.0919 | 0.023* | |
C30 | 0.48800 (14) | 1.00335 (13) | 0.10890 (7) | 0.0163 (3) | |
H30 | 0.5109 | 0.9944 | 0.0657 | 0.020* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0211 (5) | 0.0158 (5) | 0.0209 (5) | 0.0032 (4) | −0.0016 (4) | −0.0033 (4) |
C1 | 0.0166 (6) | 0.0184 (6) | 0.0144 (6) | −0.0012 (5) | 0.0015 (5) | 0.0026 (5) |
N1 | 0.0149 (6) | 0.0174 (6) | 0.0173 (5) | 0.0023 (4) | 0.0008 (4) | 0.0024 (4) |
C2 | 0.0216 (7) | 0.0301 (8) | 0.0182 (7) | −0.0033 (6) | −0.0042 (6) | 0.0008 (6) |
C3 | 0.0261 (8) | 0.0157 (6) | 0.0211 (7) | 0.0004 (6) | 0.0048 (6) | −0.0046 (5) |
C4 | 0.0313 (9) | 0.0184 (7) | 0.0311 (8) | 0.0058 (6) | 0.0045 (7) | −0.0023 (6) |
C5 | 0.0200 (7) | 0.0230 (7) | 0.0285 (8) | 0.0090 (6) | 0.0034 (6) | 0.0038 (6) |
C6 | 0.0218 (7) | 0.0180 (6) | 0.0232 (7) | −0.0001 (6) | −0.0033 (6) | −0.0022 (5) |
B1 | 0.0127 (6) | 0.0143 (6) | 0.0132 (6) | 0.0006 (5) | 0.0005 (5) | −0.0001 (5) |
C7 | 0.0159 (6) | 0.0154 (6) | 0.0118 (5) | −0.0007 (5) | −0.0007 (5) | 0.0001 (5) |
C8 | 0.0172 (6) | 0.0178 (6) | 0.0207 (7) | 0.0007 (5) | −0.0051 (5) | 0.0010 (5) |
C9 | 0.0297 (8) | 0.0148 (6) | 0.0227 (7) | −0.0014 (6) | −0.0102 (6) | 0.0031 (5) |
C10 | 0.0315 (8) | 0.0199 (7) | 0.0153 (6) | −0.0096 (6) | −0.0039 (6) | 0.0031 (5) |
C11 | 0.0213 (7) | 0.0254 (8) | 0.0168 (6) | −0.0063 (6) | 0.0026 (6) | 0.0008 (6) |
C12 | 0.0173 (6) | 0.0190 (7) | 0.0162 (6) | 0.0009 (5) | 0.0018 (5) | 0.0019 (5) |
C13 | 0.0121 (6) | 0.0157 (6) | 0.0133 (6) | 0.0019 (5) | 0.0019 (5) | 0.0010 (5) |
C14 | 0.0167 (6) | 0.0172 (6) | 0.0140 (6) | −0.0009 (5) | 0.0011 (5) | 0.0003 (5) |
C15 | 0.0172 (6) | 0.0278 (8) | 0.0144 (6) | −0.0019 (6) | −0.0006 (5) | −0.0012 (6) |
C16 | 0.0188 (7) | 0.0313 (8) | 0.0139 (6) | 0.0060 (6) | −0.0011 (6) | 0.0017 (6) |
C17 | 0.0229 (7) | 0.0205 (7) | 0.0177 (7) | 0.0063 (6) | 0.0027 (6) | 0.0049 (5) |
C18 | 0.0160 (6) | 0.0162 (6) | 0.0182 (6) | 0.0009 (5) | 0.0014 (5) | 0.0010 (5) |
C19 | 0.0147 (6) | 0.0162 (6) | 0.0141 (6) | 0.0033 (5) | −0.0017 (5) | −0.0002 (5) |
C20 | 0.0175 (6) | 0.0201 (7) | 0.0148 (6) | 0.0048 (6) | −0.0009 (5) | −0.0004 (5) |
C21 | 0.0255 (8) | 0.0247 (7) | 0.0158 (6) | 0.0098 (6) | −0.0014 (6) | −0.0045 (5) |
C22 | 0.0323 (9) | 0.0201 (7) | 0.0248 (7) | 0.0053 (7) | −0.0060 (7) | −0.0075 (6) |
C23 | 0.0287 (8) | 0.0189 (7) | 0.0310 (9) | −0.0037 (6) | −0.0012 (7) | −0.0045 (6) |
C24 | 0.0200 (7) | 0.0187 (7) | 0.0225 (7) | −0.0004 (6) | 0.0026 (6) | −0.0038 (5) |
C25 | 0.0136 (6) | 0.0121 (6) | 0.0164 (6) | 0.0001 (5) | 0.0010 (5) | −0.0013 (5) |
C26 | 0.0165 (6) | 0.0193 (7) | 0.0164 (6) | 0.0009 (5) | 0.0001 (5) | −0.0032 (5) |
C27 | 0.0202 (7) | 0.0238 (7) | 0.0201 (7) | 0.0013 (6) | 0.0057 (6) | −0.0057 (5) |
C28 | 0.0141 (6) | 0.0192 (7) | 0.0296 (8) | 0.0021 (5) | 0.0042 (6) | −0.0035 (6) |
C29 | 0.0151 (6) | 0.0170 (6) | 0.0253 (7) | 0.0029 (5) | −0.0039 (6) | −0.0019 (5) |
C30 | 0.0162 (6) | 0.0171 (6) | 0.0156 (6) | 0.0012 (5) | −0.0002 (5) | −0.0010 (5) |
O1—C1 | 1.3086 (18) | C12—H12 | 0.9500 |
O1—C3 | 1.4712 (17) | C13—C14 | 1.400 (2) |
C1—N1 | 1.2965 (19) | C13—C18 | 1.4045 (19) |
C1—C2 | 1.482 (2) | C14—C15 | 1.392 (2) |
N1—C6 | 1.464 (2) | C14—H14 | 0.9500 |
N1—C5 | 1.4683 (19) | C15—C16 | 1.384 (2) |
C2—H2A | 0.9800 | C15—H15 | 0.9500 |
C2—H2B | 0.9800 | C16—C17 | 1.385 (2) |
C2—H2C | 0.9800 | C16—H16 | 0.9500 |
C3—C4 | 1.492 (2) | C17—C18 | 1.389 (2) |
C3—H3A | 0.9900 | C17—H17 | 0.9500 |
C3—H3B | 0.9900 | C18—H18 | 0.9500 |
C4—H4A | 0.9800 | C19—C24 | 1.402 (2) |
C4—H4B | 0.9800 | C19—C20 | 1.4028 (19) |
C4—H4C | 0.9800 | C20—C21 | 1.396 (2) |
C5—H5A | 0.9800 | C20—H20 | 0.9500 |
C5—H5B | 0.9800 | C21—C22 | 1.383 (3) |
C5—H5C | 0.9800 | C21—H21 | 0.9500 |
C6—H6A | 0.9800 | C22—C23 | 1.385 (2) |
C6—H6B | 0.9800 | C22—H22 | 0.9500 |
C6—H6C | 0.9800 | C23—C24 | 1.390 (2) |
B1—C25 | 1.641 (2) | C23—H23 | 0.9500 |
B1—C7 | 1.643 (2) | C24—H24 | 0.9500 |
B1—C19 | 1.647 (2) | C25—C26 | 1.3963 (19) |
B1—C13 | 1.650 (2) | C25—C30 | 1.4019 (19) |
C7—C8 | 1.397 (2) | C26—C27 | 1.392 (2) |
C7—C12 | 1.408 (2) | C26—H26 | 0.9500 |
C8—C9 | 1.394 (2) | C27—C28 | 1.380 (2) |
C8—H8 | 0.9500 | C27—H27 | 0.9500 |
C9—C10 | 1.381 (3) | C28—C29 | 1.388 (2) |
C9—H9 | 0.9500 | C28—H28 | 0.9500 |
C10—C11 | 1.383 (2) | C29—C30 | 1.386 (2) |
C10—H10 | 0.9500 | C29—H29 | 0.9500 |
C11—C12 | 1.388 (2) | C30—H30 | 0.9500 |
C11—H11 | 0.9500 | ||
C1—O1—C3 | 120.57 (12) | C11—C12—C7 | 122.80 (14) |
N1—C1—O1 | 115.87 (13) | C11—C12—H12 | 118.6 |
N1—C1—C2 | 122.33 (14) | C7—C12—H12 | 118.6 |
O1—C1—C2 | 121.80 (13) | C14—C13—C18 | 115.19 (13) |
C1—N1—C6 | 122.65 (13) | C14—C13—B1 | 122.17 (12) |
C1—N1—C5 | 122.11 (13) | C18—C13—B1 | 122.63 (12) |
C6—N1—C5 | 115.24 (12) | C15—C14—C13 | 122.79 (14) |
C1—C2—H2A | 109.5 | C15—C14—H14 | 118.6 |
C1—C2—H2B | 109.5 | C13—C14—H14 | 118.6 |
H2A—C2—H2B | 109.5 | C16—C15—C14 | 120.26 (15) |
C1—C2—H2C | 109.5 | C16—C15—H15 | 119.9 |
H2A—C2—H2C | 109.5 | C14—C15—H15 | 119.9 |
H2B—C2—H2C | 109.5 | C15—C16—C17 | 118.58 (14) |
O1—C3—C4 | 106.22 (13) | C15—C16—H16 | 120.7 |
O1—C3—H3A | 110.5 | C17—C16—H16 | 120.7 |
C4—C3—H3A | 110.5 | C16—C17—C18 | 120.59 (14) |
O1—C3—H3B | 110.5 | C16—C17—H17 | 119.7 |
C4—C3—H3B | 110.5 | C18—C17—H17 | 119.7 |
H3A—C3—H3B | 108.7 | C17—C18—C13 | 122.48 (14) |
C3—C4—H4A | 109.5 | C17—C18—H18 | 118.8 |
C3—C4—H4B | 109.5 | C13—C18—H18 | 118.8 |
H4A—C4—H4B | 109.5 | C24—C19—C20 | 114.88 (13) |
C3—C4—H4C | 109.5 | C24—C19—B1 | 119.72 (12) |
H4A—C4—H4C | 109.5 | C20—C19—B1 | 125.38 (13) |
H4B—C4—H4C | 109.5 | C21—C20—C19 | 122.59 (14) |
N1—C5—H5A | 109.5 | C21—C20—H20 | 118.7 |
N1—C5—H5B | 109.5 | C19—C20—H20 | 118.7 |
H5A—C5—H5B | 109.5 | C22—C21—C20 | 120.45 (14) |
N1—C5—H5C | 109.5 | C22—C21—H21 | 119.8 |
H5A—C5—H5C | 109.5 | C20—C21—H21 | 119.8 |
H5B—C5—H5C | 109.5 | C21—C22—C23 | 118.77 (15) |
N1—C6—H6A | 109.5 | C21—C22—H22 | 120.6 |
N1—C6—H6B | 109.5 | C23—C22—H22 | 120.6 |
H6A—C6—H6B | 109.5 | C22—C23—C24 | 120.03 (15) |
N1—C6—H6C | 109.5 | C22—C23—H23 | 120.0 |
H6A—C6—H6C | 109.5 | C24—C23—H23 | 120.0 |
H6B—C6—H6C | 109.5 | C23—C24—C19 | 123.28 (14) |
C25—B1—C7 | 110.73 (11) | C23—C24—H24 | 118.4 |
C25—B1—C19 | 107.60 (11) | C19—C24—H24 | 118.4 |
C7—B1—C19 | 111.72 (11) | C26—C25—C30 | 115.32 (12) |
C25—B1—C13 | 109.61 (11) | C26—C25—B1 | 123.41 (12) |
C7—B1—C13 | 108.36 (11) | C30—C25—B1 | 121.28 (12) |
C19—B1—C13 | 108.78 (11) | C27—C26—C25 | 122.69 (14) |
C8—C7—C12 | 114.83 (13) | C27—C26—H26 | 118.7 |
C8—C7—B1 | 124.21 (13) | C25—C26—H26 | 118.7 |
C12—C7—B1 | 120.85 (12) | C28—C27—C26 | 120.27 (14) |
C9—C8—C7 | 122.82 (14) | C28—C27—H27 | 119.9 |
C9—C8—H8 | 118.6 | C26—C27—H27 | 119.9 |
C7—C8—H8 | 118.6 | C27—C28—C29 | 118.79 (14) |
C10—C9—C8 | 120.52 (15) | C27—C28—H28 | 120.6 |
C10—C9—H9 | 119.7 | C29—C28—H28 | 120.6 |
C8—C9—H9 | 119.7 | C30—C29—C28 | 120.19 (14) |
C9—C10—C11 | 118.46 (14) | C30—C29—H29 | 119.9 |
C9—C10—H10 | 120.8 | C28—C29—H29 | 119.9 |
C11—C10—H10 | 120.8 | C29—C30—C25 | 122.72 (13) |
C10—C11—C12 | 120.53 (15) | C29—C30—H30 | 118.6 |
C10—C11—H11 | 119.7 | C25—C30—H30 | 118.6 |
C12—C11—H11 | 119.7 | ||
C3—O1—C1—N1 | 176.76 (12) | C16—C17—C18—C13 | −0.4 (2) |
C3—O1—C1—C2 | −4.0 (2) | C14—C13—C18—C17 | −2.6 (2) |
O1—C1—N1—C6 | 1.3 (2) | B1—C13—C18—C17 | 178.54 (13) |
C2—C1—N1—C6 | −178.02 (14) | C25—B1—C19—C24 | −37.11 (17) |
O1—C1—N1—C5 | −177.86 (13) | C7—B1—C19—C24 | −158.86 (13) |
C2—C1—N1—C5 | 2.9 (2) | C13—B1—C19—C24 | 81.56 (16) |
C1—O1—C3—C4 | −171.52 (13) | C25—B1—C19—C20 | 144.72 (13) |
C25—B1—C7—C8 | −2.65 (18) | C7—B1—C19—C20 | 22.97 (19) |
C19—B1—C7—C8 | 117.28 (14) | C13—B1—C19—C20 | −96.61 (15) |
C13—B1—C7—C8 | −122.89 (14) | C24—C19—C20—C21 | −0.5 (2) |
C25—B1—C7—C12 | 173.30 (12) | B1—C19—C20—C21 | 177.71 (13) |
C19—B1—C7—C12 | −66.78 (16) | C19—C20—C21—C22 | 0.0 (2) |
C13—B1—C7—C12 | 53.05 (16) | C20—C21—C22—C23 | 0.5 (2) |
C12—C7—C8—C9 | 1.0 (2) | C21—C22—C23—C24 | −0.5 (3) |
B1—C7—C8—C9 | 177.16 (13) | C22—C23—C24—C19 | 0.0 (3) |
C7—C8—C9—C10 | 0.4 (2) | C20—C19—C24—C23 | 0.5 (2) |
C8—C9—C10—C11 | −1.5 (2) | B1—C19—C24—C23 | −177.81 (14) |
C9—C10—C11—C12 | 1.1 (2) | C7—B1—C25—C26 | −113.31 (15) |
C10—C11—C12—C7 | 0.4 (2) | C19—B1—C25—C26 | 124.32 (14) |
C8—C7—C12—C11 | −1.4 (2) | C13—B1—C25—C26 | 6.19 (19) |
B1—C7—C12—C11 | −177.70 (13) | C7—B1—C25—C30 | 66.74 (16) |
C25—B1—C13—C14 | −101.29 (15) | C19—B1—C25—C30 | −55.62 (16) |
C7—B1—C13—C14 | 19.65 (17) | C13—B1—C25—C30 | −173.76 (12) |
C19—B1—C13—C14 | 141.31 (13) | C30—C25—C26—C27 | −0.8 (2) |
C25—B1—C13—C18 | 77.45 (16) | B1—C25—C26—C27 | 179.30 (14) |
C7—B1—C13—C18 | −161.60 (12) | C25—C26—C27—C28 | −0.2 (2) |
C19—B1—C13—C18 | −39.95 (17) | C26—C27—C28—C29 | 0.7 (2) |
C18—C13—C14—C15 | 3.5 (2) | C27—C28—C29—C30 | −0.2 (2) |
B1—C13—C14—C15 | −177.70 (13) | C28—C29—C30—C25 | −0.8 (2) |
C13—C14—C15—C16 | −1.3 (2) | C26—C25—C30—C29 | 1.3 (2) |
C14—C15—C16—C17 | −2.0 (2) | B1—C25—C30—C29 | −178.78 (13) |
C15—C16—C17—C18 | 2.8 (2) |
Cg1, Cg2 and Cg3 are the centroids of the C7–C12, C13–C18 and C25–C30 rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3A···Cg1 | 0.99 | 2.67 | 3.572 (2) | 151 |
C5—H5B···Cg2 | 0.98 | 2.70 | 3.450 (2) | 134 |
C6—H6B···Cg3 | 0.98 | 2.72 | 3.692 (2) | 175 |
Cg1, Cg2 and Cg3 are the centroids of the C7–C12, C13–C18 and C25–C30 rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3A···Cg1 | 0.99 | 2.67 | 3.572 (2) | 151 |
C5—H5B···Cg2 | 0.98 | 2.70 | 3.450 (2) | 134 |
C6—H6B···Cg3 | 0.98 | 2.72 | 3.692 (2) | 175 |
Acknowledgements
The authors thank Dr W. Frey (Institut für Organische Chemie, Universität Stuttgart) for measuring the diffraction data.
References
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Carboxamide-dialkyl sulfate adducts are salts that can be used for acetalization reactions (Kantlehner et al., 1980). The 1:1 adduct of N,N-dimethylacetamide and diethyl sulfate, known as (ethoxyethylidene)dimethylazanium ethyl sulfate (Tiritiris et al., 2015) is one of them. By reaction with sodium tetraphenylborate in acetonitrile, it was possible to achieve an anion exchange and to obtain the title compound. The structure analysis reveals that the bond lengths and angles in the cation are in very good agreement with the data obtained from the structure analysis of (ethoxyethylidene)dimethylazanium ethyl sulfate (Tiritiris et al., 2015). In the tetraphenylborate salt, the C5–N1 bond length is 1.468 (2) Å, C6–N1 = 1.464 (2) Å and C1–N1 = 1.297 (2) Å, showing single and double bond character, respectively. The C–N1–C angles are: 115.24 (12)° (C5–N1–C6), 122.11 (13)° (C1–N1–C5) and 122.65 (13)° (C1–N1–C6), which indicates a nearly trigonal-planar surrounding of the nitrogen centre by the carbon atoms (Fig. 1). The C–O bond length shows with 1.309 (2) Å double bond character. The positive charge is completely delocalized on the plane formed by the atoms N1, C1 and O1 (Fig. 1). The C3–O1 bond length of 1.471 (2) Å is indicating single bond character. The bond lengths and angles in the tetraphenylborate ions are in good agreement with the data from the crystal structure analysis of the alkali metal tetraphenylborates (Behrens et al., 2012). C–H···π interactions between the iminium hydrogen atoms of –N(CH3)2 and –CH2 groups and the phenyl carbon atoms (centroids: Cg1 = C7—C12, Cg2 = C13—C18 and Cg3 = C25—C30) of the tetraphenylborate ion are present (Fig. 2), ranging from 2.67 to 2.72 Å (Tab. 1). Such a type of interactions were also observed in the iminium salts (methoxymethylidene)dimethylazanium tetraphenylborate acetonitrile monosolvate (Tiritiris et al., 2014a) and (butoxymethylidene)dimethylazanium tetraphenylborate acetonitrile monosolvate (Tiritiris et al., 2014b). The phenyl rings form aromatic pockets, in which the guanidinium ions are embedded.