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Acta Cryst. (2009). E65, o383    [ doi:10.1107/S1600536809002414 ]

2-[(2-Hydroxy-2,2-diphenylethyl)(methyl)amino]-N,N-dimethylethanaminium bromide

V. H. Gessner, C. Däschlein and C. Strohmann

Abstract top

The title compound, C19H27N2O+·Br-, is the hydrobromide of the trapping product of lithiated N,N,N',N'-tetramethylethylenediamine (TMEDA) with benzophenone. Thereby, the N atom of the NMe2 group is selectively protonated and the respective trapping product represents a potential tridentate ligand with one O and two N donor atoms. The H atoms at N (H2N) and O (H1O) are involved in hydrogen bonds with the Br-. The molecular structure shows all donor atoms to be arranged on one side of the molecule, thus indicating a potential threefold coordination of a Lewis acid.

Comment top

Due to their application in many fields of chemistry, the preparation of nitrogen ligands is still of great interest in synthetic chemistry. Recent investigations have proved the direct deprotonation of methylamines to be a synthetically very useful method for functionalizations and thus for the synthesis of nitrogen ligands. Further donor atoms as well as further stereocenters can easily be introduced to the molecule. Only few tertiary methylamines are known for their reactivity towards such a direct lithiation reaction, amongst (R,R)-TMCDA (Strohmann & Gessner, 2007a,c, 2008a; Strohmann et al., 2008), PMDTA (Strohmann & Gessner, 2007b) and TMEDA (Gessner & Strohmann, 2008; Köhler et al., 1987). Generally, this type of reaction is an undesired side reaction resulting in the loss of base and leading to side products, e.g. in deprotonation or addition reactions with lithiumalkyls (Arnold et al., 2002). However, this decomposition of the Lewis base can also be used synthetically for the preparation of new ligand systems (Karsch, 1996; Bojer et al., 2007; Strohmann & Gessner, 2008b).

The title compound 2-[(2'-Hydroxy-2',2'-diphenylethyl)-N'-methyl(amino)]-N,N-dimethylethanaminium bromide can be synthesized by direct deprotonation of TMEDA with tert-butyllithium and the subsequent trapping reaction with benzophenone. The yield of this lithiation reaction is limited due to the competitive deprotonation of the ethylene bridge of the ligand. Treatment of the resulting amino alcohol with lithiumbromide under acidic conditions gives the hydrobromide as colorless crystals. The structure indicates a potential threefold coordination as all donor atoms (two N atoms and one oxygen) are arranged at the same side of the molecule.

2-[(2'-Hydroxy-2',2'-diphenylethyl)-N'-methyl(amino)]-N,N-dimethylethanaminium bromide crystallizes in the othorhombic crystal system, space group Pbca. The asymmetric unit contains only one molecule of the monomeric compound.

Related literature top

For related literature on direct deprotonation of tertiary amines, see: Strohmann & Gessner (2007a,b,c, 2008a,b), Gessner & Strohmann (2008); Bojer et al. (2007); Karsch (1996); Strohmann et al. (2008); Köhler et al. (1987); Arnold et al. (2002).

Experimental top

2-(2-Dimethylaminoethyl)(methyl)amino-1,1-diphenylethanol and an equivalent amount of LiBr were dissolved in a mixture of acetone and a few trops acetic acid and stored at room temperature for 24 h. After evaporation of the solvent a crystalline solid remained, suitable for X-ray studies.

1H NMR (400.1 MHz, D2O): δ = 2.17 (s, 3H; N(CH3)CH2), 2.42 (s, 6H; N(CH3)2), 2,68 (t, 3JHH = 6.16 Hz, 3H; CH2N), 2.95 (t, 3JHH = 6.14 Hz, 2H; CH2N), 3.43 (s, 2H; NCH2C(OH)Ph2), 6.60–7.10 (br, 2H; NH and OH), 7.20–7.24 (m, 2H; Hpara), 7.24–2.33 (m, 4H; Harom), 7.41–2.43 (m, 4H; Harom).

{1H}13C NMR (100.6 MHz, D2O): δ = 42.4 (HN(CH3)2), 43.7 (N(CH3)CH2), 52.9 (CH2N(H)(CH3)2), 55.1 (CH2CH2N(CH3)CH2), 66.6 (NCH2C(OH)Ph2), 78.1 (CPh2), 125.9 (Cmeta), 1276.4 (Cpara), 128.6 (Cortho), 145.3 (Cipso).

Refinement top

Refinement was accomplished by full-matrix least-squares methods (based on Fo2, SHELXL97); anisotropic thermal parameters for all non-H atoms in the final cycles; the H atoms were calculated into idealized positions and refined using a riding model with Uiso(H) = 1.2Ueq(C) for CH and CH2 groups and 1.5Ueq(C) for methyl groups. The positions of H2N and H1O were determined from the difference Fourier map and they were refined without constraints.

Computing details top

Data collection: SMART (Bruker, 2001); cell refinement: SAINT-Plus (Bruker, 1999); data reduction: SAINT-Plus (Bruker, 1999); program(s) used to solve structure: SHELXS90 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top
[Figure 1] Fig. 1. ORTEP plot of 2-[(2'-Hydroxy-2',2'-diphenylethyl)-N'-methyl(amino)]-N,N-dimethylethanaminium bromide. Thermal ellipsoids are drawn at the 50% probability level.
2-[(2-Hydroxy-2,2-diphenylethyl)(methyl)amino]-N,N-\ dimethylethanaminium bromide top
Crystal data top
C19H27N2O+·Br−F(000) = 1584
Mr = 379.34Dx = 1.358 Mg m−3
Orthorhombic, PbcaMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ac 2abθ = 1.2–26°
a = 7.119 (2) ŵ = 2.22 mm−1
b = 15.515 (3) ÅT = 173 K
c = 33.585 (7) ÅNeedle, colourless
V = 3710 (1) Å30.4 × 0.2 × 0.2 mm
Z = 8
Data collection top
Bruker APEX CCD
diffractometer		3640 independent reflections
Radiation source: fine-focus sealed tube3200 reflections with I > 2σ(I)
graphiteRint = 0.064
ω scansθmax = 26°, θmin = 1.2°
Absorption correction: empirical (using intensity measurements)
(SADABS; Bruker, 1999)		h = −8→8
Tmin = 0.440, Tmax = 0.635k = −19→19
78737 measured reflectionsl = −41→41
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.037Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.099H atoms treated by a mixture of independent and constrained refinement
S = 1.07 w = 1/[σ2(Fo2) + (0.0504P)2 + 4.0375P]
where P = (Fo2 + 2Fc2)/3
3640 reflections(Δ/σ)max = 0.003
219 parametersΔρmax = 0.49 e Å−3
0 restraintsΔρmin = −0.43 e Å−3
Crystal data top
C19H27N2O+·Br−V = 3710 (1) Å3
Mr = 379.34Z = 8
Orthorhombic, PbcaMo Kα radiation
a = 7.119 (2) ŵ = 2.22 mm−1
b = 15.515 (3) ÅT = 173 K
c = 33.585 (7) Å0.4 × 0.2 × 0.2 mm
Data collection top
Bruker APEX CCD
diffractometer		3640 independent reflections
Absorption correction: empirical (using intensity measurements)
(SADABS; Bruker, 1999)		3200 reflections with I > 2σ(I)
Tmin = 0.440, Tmax = 0.635Rint = 0.064
78737 measured reflectionsθmax = 26°
Refinement top
R[F2 > 2σ(F2)] = 0.037H atoms treated by a mixture of independent and constrained refinement
wR(F2) = 0.099Δρmax = 0.49 e Å−3
S = 1.07Δρmin = −0.43 e Å−3
3640 reflectionsAbsolute structure: ?
219 parametersFlack parameter: ?
0 restraintsRogers parameter: ?
Special details top

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Br0.55743 (4)0.697337 (19)0.564819 (9)0.03232 (11)
C10.5689 (4)0.93459 (17)0.63574 (8)0.0250 (6)
C20.6972 (4)0.88169 (17)0.66284 (8)0.0250 (6)
C30.8583 (4)0.9173 (2)0.67970 (9)0.0320 (7)
H30.88920.97570.67430.038*
C40.9747 (5)0.8691 (2)0.70430 (9)0.0406 (8)
H41.08390.89460.71550.049*
C50.9321 (5)0.7848 (2)0.71242 (10)0.0450 (9)
H51.01220.75160.72910.054*
C60.7726 (5)0.7483 (2)0.69634 (10)0.0429 (8)
H60.74270.69000.70210.052*
C70.6550 (5)0.79621 (19)0.67180 (9)0.0332 (7)
H70.54510.77040.66110.040*
C80.4435 (4)0.99595 (17)0.65971 (8)0.0263 (6)
C90.4565 (4)1.0055 (2)0.70069 (9)0.0335 (7)
H90.54760.97360.71510.040*
C100.3373 (5)1.0615 (2)0.72079 (9)0.0380 (7)
H100.34731.06710.74890.046*
C110.2045 (5)1.1091 (2)0.70046 (10)0.0372 (7)
H110.12501.14800.71430.045*
C120.1884 (4)1.09930 (19)0.65969 (9)0.0337 (7)
H120.09651.13120.64540.040*
C130.3059 (4)1.04315 (18)0.63960 (9)0.0290 (6)
H130.29281.03660.61160.035*
C140.6829 (4)0.98676 (17)0.60473 (8)0.0285 (6)
H14A0.59871.02850.59140.034*
H14B0.78241.01980.61860.034*
C150.6945 (5)0.9484 (2)0.53493 (9)0.0402 (8)
H15A0.73151.00660.52670.060*
H15B0.55720.94430.53550.060*
H15C0.74450.90620.51600.060*
C160.9753 (4)0.93415 (19)0.57482 (9)0.0289 (6)
H16A1.02050.93330.60270.035*
H16B1.01680.98900.56260.035*
C171.0617 (4)0.85949 (18)0.55238 (9)0.0288 (6)
H17A1.03600.86640.52360.035*
H17B1.19950.86030.55620.035*
C181.0397 (5)0.70427 (19)0.53833 (10)0.0345 (7)
H18A1.17610.69600.53920.052*
H18B1.00180.71980.51120.052*
H18C0.97670.65080.54620.052*
C191.0432 (4)0.7534 (2)0.60756 (9)0.0344 (7)
H19A0.98050.70020.61610.052*
H19B1.00710.80070.62530.052*
H19C1.17960.74530.60860.052*
N10.7695 (3)0.93059 (15)0.57460 (7)0.0262 (5)
N20.9858 (4)0.77440 (16)0.56609 (7)0.0260 (5)
H2N0.864 (6)0.779 (2)0.5669 (10)0.044 (10)*
O0.4411 (3)0.88041 (14)0.61458 (7)0.0298 (5)
H1O0.494 (5)0.849 (2)0.6050 (10)0.024 (10)*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Br0.02792 (17)0.03281 (18)0.03624 (18)−0.00315 (12)0.00142 (12)−0.00227 (12)
C10.0251 (14)0.0217 (13)0.0283 (14)−0.0032 (11)−0.0027 (12)−0.0014 (11)
C20.0242 (14)0.0256 (14)0.0252 (13)0.0005 (11)0.0033 (11)0.0001 (11)
C30.0301 (16)0.0327 (15)0.0333 (16)−0.0008 (13)−0.0003 (13)−0.0044 (12)
C40.0297 (17)0.062 (2)0.0301 (16)0.0028 (16)−0.0057 (13)−0.0061 (15)
C50.047 (2)0.058 (2)0.0308 (17)0.0190 (17)−0.0028 (15)0.0079 (15)
C60.048 (2)0.0371 (17)0.0432 (18)0.0083 (16)0.0076 (16)0.0158 (15)
C70.0315 (16)0.0310 (15)0.0371 (16)−0.0041 (13)0.0020 (14)0.0034 (13)
C80.0249 (14)0.0217 (13)0.0324 (15)−0.0050 (11)−0.0008 (12)−0.0002 (11)
C90.0331 (17)0.0347 (16)0.0327 (16)−0.0002 (14)−0.0033 (13)−0.0013 (13)
C100.0387 (18)0.0446 (18)0.0309 (16)−0.0019 (15)0.0036 (14)−0.0070 (14)
C110.0328 (17)0.0306 (15)0.0481 (19)−0.0004 (14)0.0075 (14)−0.0079 (14)
C120.0261 (15)0.0286 (15)0.0464 (18)−0.0006 (13)0.0023 (13)0.0022 (13)
C130.0281 (15)0.0266 (14)0.0322 (15)−0.0029 (12)−0.0012 (12)0.0007 (12)
C140.0335 (16)0.0203 (13)0.0316 (15)0.0005 (12)−0.0005 (13)0.0006 (11)
C150.0403 (18)0.0470 (19)0.0334 (16)0.0054 (16)−0.0093 (14)−0.0049 (14)
C160.0276 (15)0.0301 (15)0.0289 (14)−0.0067 (12)−0.0014 (12)−0.0005 (12)
C170.0252 (15)0.0317 (15)0.0295 (14)−0.0032 (12)0.0022 (12)0.0041 (12)
C180.0328 (17)0.0323 (16)0.0384 (17)0.0026 (13)0.0037 (14)−0.0078 (13)
C190.0347 (17)0.0362 (16)0.0325 (15)0.0051 (14)−0.0004 (13)0.0063 (13)
N10.0266 (12)0.0263 (12)0.0255 (11)−0.0010 (10)−0.0018 (10)−0.0005 (9)
N20.0198 (12)0.0276 (12)0.0306 (13)0.0001 (10)0.0033 (10)0.0010 (10)
O0.0274 (11)0.0255 (11)0.0365 (12)−0.0004 (9)−0.0045 (9)−0.0082 (9)
Geometric parameters (Å, °) top
C1—O1.428 (3)C13—H130.9500
C1—C21.528 (4)C14—N11.471 (4)
C1—C81.534 (4)C14—H14A0.9900
C1—C141.549 (4)C14—H14B0.9900
C2—C71.393 (4)C15—N11.462 (4)
C2—C31.393 (4)C15—H15A0.9800
C3—C41.388 (4)C15—H15B0.9800
C3—H30.9500C15—H15C0.9800
C4—C51.370 (5)C16—N11.466 (4)
C4—H40.9500C16—C171.513 (4)
C5—C61.379 (5)C16—H16A0.9900
C5—H50.9500C16—H16B0.9900
C6—C71.390 (5)C17—N21.499 (4)
C6—H60.9500C17—H17A0.9900
C7—H70.9500C17—H17B0.9900
C8—C91.387 (4)C18—N21.483 (4)
C8—C131.397 (4)C18—H18A0.9800
C9—C101.389 (4)C18—H18B0.9800
C9—H90.9500C18—H18C0.9800
C10—C111.380 (5)C19—N21.487 (4)
C10—H100.9500C19—H19A0.9800
C11—C121.382 (4)C19—H19B0.9800
C11—H110.9500C19—H19C0.9800
C12—C131.383 (4)N2—H2N0.87 (4)
C12—H120.9500O—H1O0.69 (3)
O—C1—C2111.2 (2)C1—C14—H14A109.2
O—C1—C8104.8 (2)N1—C14—H14B109.2
C2—C1—C8111.6 (2)C1—C14—H14B109.2
O—C1—C14107.9 (2)H14A—C14—H14B107.9
C2—C1—C14111.6 (2)N1—C15—H15A109.5
C8—C1—C14109.5 (2)N1—C15—H15B109.5
C7—C2—C3117.8 (3)H15A—C15—H15B109.5
C7—C2—C1120.7 (3)N1—C15—H15C109.5
C3—C2—C1121.4 (2)H15A—C15—H15C109.5
C4—C3—C2121.3 (3)H15B—C15—H15C109.5
C4—C3—H3119.3N1—C16—C17112.0 (2)
C2—C3—H3119.3N1—C16—H16A109.2
C5—C4—C3120.0 (3)C17—C16—H16A109.2
C5—C4—H4120.0N1—C16—H16B109.2
C3—C4—H4120.0C17—C16—H16B109.2
C4—C5—C6119.7 (3)H16A—C16—H16B107.9
C4—C5—H5120.2N2—C17—C16112.0 (2)
C6—C5—H5120.2N2—C17—H17A109.2
C5—C6—C7120.6 (3)C16—C17—H17A109.2
C5—C6—H6119.7N2—C17—H17B109.2
C7—C6—H6119.7C16—C17—H17B109.2
C2—C7—C6120.5 (3)H17A—C17—H17B107.9
C2—C7—H7119.8N2—C18—H18A109.5
C6—C7—H7119.8N2—C18—H18B109.5
C9—C8—C13118.0 (3)H18A—C18—H18B109.5
C9—C8—C1123.3 (3)N2—C18—H18C109.5
C13—C8—C1118.7 (2)H18A—C18—H18C109.5
C8—C9—C10120.6 (3)H18B—C18—H18C109.5
C8—C9—H9119.7N2—C19—H19A109.5
C10—C9—H9119.7N2—C19—H19B109.5
C11—C10—C9120.8 (3)H19A—C19—H19B109.5
C11—C10—H10119.6N2—C19—H19C109.5
C9—C10—H10119.6H19A—C19—H19C109.5
C12—C11—C10119.2 (3)H19B—C19—H19C109.5
C12—C11—H11120.4C15—N1—C16111.3 (2)
C10—C11—H11120.4C15—N1—C14111.2 (2)
C11—C12—C13120.1 (3)C16—N1—C14113.2 (2)
C11—C12—H12119.9C18—N2—C19110.9 (2)
C13—C12—H12119.9C18—N2—C17111.1 (2)
C12—C13—C8121.2 (3)C19—N2—C17112.5 (2)
C12—C13—H13119.4C18—N2—H2N110 (2)
C8—C13—H13119.4C19—N2—H2N105 (2)
N1—C14—C1111.9 (2)C17—N2—H2N107 (2)
N1—C14—H14A109.2C1—O—H1O107 (3)
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N2—H2N···Br0.87 (4)2.52 (4)3.276 (3)145 (4)
O—H1O···Br0.69 (3)2.76 (3)3.398 (2)156 (3)
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
N2—H2N···Br0.87 (4)2.52 (4)3.276 (3)145 (4)
O—H1O···Br0.69 (3)2.76 (3)3.398 (2)156 (3)
Acknowledgements top

The authors are grateful to the Deutsche Forschungsgemeinschaft and the Fonds der Chemischen Industrie for financial support and the award of a scholarship (VHG). CD thanks the Studienstiftung des Deutschen Volkes for a doctoral scholarship.

references
References top

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