organic compounds
5-tert-Butyl-2-hydroxy-3-(2-thienyl)benzaldehyde
aFaculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, People's Republic of China
*Correspondence e-mail: lianghongze@nbu.edu.cn
In the 15H16O2S, the thiophene ring is essentially planar (r.m.s. deviation = 0.006 Å for all non-H atoms) and roughly coplanar with the benzene ring, the dihedral angle between the mean planes of the rings being 4.35 (8)°. An intramolecular O—H⋯O hydrogen bond is observed between the OH group and the aldehyde O atom.
of the title compound, CRelated literature
For related salicylaldehyde derivative compounds, see: Qiu et al. (2009); Yu et al. (2007); Wang et al. (2009); Wong et al. (2004).
Experimental
Crystal data
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Refinement
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Data collection: RAPID-AUTO (Rigaku, 1998); cell RAPID-AUTO; data reduction: CrystalStructure (Rigaku/MSC, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536810030382/zq2050sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810030382/zq2050Isup2.hkl
3-Bromo-5-tert-butyl-2-hydroxybenzaldehyde (1.50 g, 5.86 mmol), 2-thienyl-tributyltin (2.40 g, 6.45 mmol), triphenyl phosphine (0.31 g, 0.38 mmol) and palladium dichloride (0.05 g, 0.28 mmol) were added to 20 ml THF in a round flask, and this mixture was refluxed with agitation for 24 h. Then, 20 ml toluene was added and the mixture was refluxed at 100°C for another 24 h. Finally, the reaction mixture was refluxed at 105°C after addition of 20 ml DMF for further 24 h. After evaporating the solvent, the residue was chromatographed on silica gel and a yellowish precipitate was produced. The precipitate was recrystallized from dichloromethane and yellow block-shaped crystals were obtained (0.62 g, 41%). 1H NMR (400 MHz, CDCl3): 11.73 (s, 1H), 9.93 (s, 1H), 7.91 (d, J = 2.0 Hz, 1H), 7.31 (dd, J = 1.2 Hz, J = 3.6 Hz,1H), 7.48 (d, J = 2.4 Hz, 1H), 7.37 (dd, J = 4.8 Hz, J = 0.8 Hz, 1H), 7.25 (s, 1H), 7.13 (dd, J = 3.6 Hz, J = 4.8 Hz, 1H), 1.37 (s, 9H). MS (EI, m/z): 260[M]+
The H atoms attached to C atoms were placed in calculated positions and treated using a riding-model approximation (with C–H = 0.95 Å and Uiso(H) = 1.2Ueq(C) for aromatic H atoms, and with C–H = 0.98 Å and Uiso(H) = 1.5Ueq(C) for the methyl H atoms). The important H atoms bonded to O2 and C6 were located in the difference Fourier map and were freely refined.
Salicylaldehyde and its derivatives are widely used in the construction of metal complexes (Qiu et al., 2009; Wang et al., 2009; Yu et al., 2007). We have synthesized a series of lanthanide complexes of a Schiff base which derived from 2-pyridyl salicylaldehyde and investigated their luminescent properties (Wong et al., 2004). In the course of exploring new luminescent compounds, we synthesized the title molecule 5-tert-butyl-2-hydroxy-3-thiophen-2-ylbenzaldehyde (I) as an intermediate compound.
The molecular structure of the title compound is shown in Fig. 1. The thiophene ring is essentially planar (rms deviation = 0.006Å for all non-H atoms) and roughly coplanar with the phenyl ring, making a dihedral angle between the mean planes of the rings of 4.35 (8)°. There are no intermolecular hydrogen bonds in the
but the intramolecular interaction O2—H2D···O1 between the hydroxy OH group and the aldehyde O atom is helpful to stabilize the molecular conformation.For related salicylaldehyde derivative compounds, see: Qiu et al. (2009); Yu et al. (2007); Wang et al. (2009). For the luminescent properties of lanthanide complexes, see: Wong et al. (2004).
Data collection: RAPID-AUTO (Rigaku, 1998); cell
RAPID-AUTO (Rigaku, 1998); data reduction: CrystalStructure (Rigaku/MSC, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. View of (I) with displacement ellipsoids drawn at the 30% probability level. The dotted line indicates the intramolecular H-bond. |
C15H16O2S | Z = 2 |
Mr = 260.34 | F(000) = 276 |
Triclinic, P1 | Dx = 1.294 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 7.2016 (14) Å | Cell parameters from 5891 reflections |
b = 8.9375 (18) Å | θ = 3.0–26.4° |
c = 10.922 (2) Å | µ = 0.23 mm−1 |
α = 91.50 (3)° | T = 173 K |
β = 107.69 (3)° | Block, yellow |
γ = 93.25 (3)° | 0.10 × 0.10 × 0.10 mm |
V = 668.0 (2) Å3 |
Rigaku R-AXIS RAPID diffractometer | 2705 independent reflections |
Radiation source: fine-focus sealed tube | 1958 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.020 |
Detector resolution: 0 pixels mm-1 | θmax = 26.4°, θmin = 3.0° |
ω scans | h = −8→8 |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | k = −11→11 |
Tmin = 0.977, Tmax = 0.977 | l = −13→13 |
5891 measured reflections |
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)] = 0.059 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.208 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.15 | w = 1/[σ2(Fo2) + (0.1265P)2 + 0.0566P] where P = (Fo2 + 2Fc2)/3 |
2705 reflections | (Δ/σ)max < 0.001 |
179 parameters | Δρmax = 0.41 e Å−3 |
9 restraints | Δρmin = −0.45 e Å−3 |
C15H16O2S | γ = 93.25 (3)° |
Mr = 260.34 | V = 668.0 (2) Å3 |
Triclinic, P1 | Z = 2 |
a = 7.2016 (14) Å | Mo Kα radiation |
b = 8.9375 (18) Å | µ = 0.23 mm−1 |
c = 10.922 (2) Å | T = 173 K |
α = 91.50 (3)° | 0.10 × 0.10 × 0.10 mm |
β = 107.69 (3)° |
Rigaku R-AXIS RAPID diffractometer | 2705 independent reflections |
Absorption correction: multi-scan (ABSCOR; Higashi, 1995) | 1958 reflections with I > 2σ(I) |
Tmin = 0.977, Tmax = 0.977 | Rint = 0.020 |
5891 measured reflections |
R[F2 > 2σ(F2)] = 0.059 | 9 restraints |
wR(F2) = 0.208 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.15 | Δρmax = 0.41 e Å−3 |
2705 reflections | Δρmin = −0.45 e Å−3 |
179 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 | ||
S1 | 0.39900 (12) | 0.44272 (9) | 0.30990 (6) | 0.0798 (4) | |
O2 | 0.3088 (3) | 0.6482 (2) | 0.12395 (19) | 0.0677 (5) | |
C15 | 0.2702 (3) | 0.3967 (2) | 0.0406 (2) | 0.0482 (5) | |
C14 | 0.2152 (3) | 0.3004 (2) | −0.0692 (2) | 0.0496 (5) | |
H14A | 0.2226 | 0.1957 | −0.0574 | 0.060* | |
C13 | 0.1403 (3) | 0.4992 (3) | −0.2105 (2) | 0.0544 (6) | |
H13A | 0.0979 | 0.5352 | −0.2949 | 0.065* | |
C12 | 0.3408 (3) | 0.3350 (3) | 0.1694 (2) | 0.0508 (5) | |
C11 | 0.1504 (3) | 0.3476 (2) | −0.1946 (2) | 0.0497 (5) | |
C10 | 0.2573 (3) | 0.5507 (3) | 0.0206 (2) | 0.0507 (5) | |
C9 | 0.1912 (3) | 0.6013 (3) | −0.1048 (2) | 0.0556 (6) | |
C8 | 0.0927 (4) | 0.2304 (3) | −0.3084 (2) | 0.0564 (6) | |
C7 | 0.3726 (4) | 0.1835 (3) | 0.1953 (2) | 0.0636 (6) | |
O1 | 0.2186 (4) | 0.8609 (2) | −0.0407 (2) | 0.0947 (7) | |
C6 | 0.1769 (5) | 0.7611 (3) | −0.1262 (3) | 0.0748 (8) | |
C5 | 0.4400 (4) | 0.1649 (3) | 0.3312 (3) | 0.0721 (7) | |
H5A | 0.4688 | 0.0706 | 0.3682 | 0.087* | |
C4 | 0.2655 (4) | 0.1362 (3) | −0.3025 (2) | 0.0716 (7) | |
H4A | 0.3763 | 0.2017 | −0.3080 | 0.107* | |
H4B | 0.2283 | 0.0616 | −0.3746 | 0.107* | |
H4C | 0.3026 | 0.0851 | −0.2212 | 0.107* | |
C3 | 0.0331 (5) | 0.3042 (3) | −0.4383 (2) | 0.0759 (8) | |
H3A | 0.1425 | 0.3700 | −0.4456 | 0.114* | |
H3B | −0.0795 | 0.3635 | −0.4446 | 0.114* | |
H3C | −0.0017 | 0.2265 | −0.5079 | 0.114* | |
C2 | −0.0816 (4) | 0.1276 (3) | −0.2998 (3) | 0.0757 (8) | |
H2A | −0.1191 | 0.0532 | −0.3721 | 0.114* | |
H2B | −0.1922 | 0.1881 | −0.3032 | 0.114* | |
H2C | −0.0443 | 0.0761 | −0.2187 | 0.114* | |
C1 | 0.4584 (4) | 0.2933 (4) | 0.4010 (3) | 0.0765 (8) | |
H7 | 0.354 (6) | 0.109 (3) | 0.140 (3) | 0.127 (14)* | |
H2 | 0.504 (4) | 0.303 (4) | 0.4875 (10) | 0.082 (9)* | |
H6A | 0.135 (6) | 0.804 (5) | −0.213 (4) | 0.127 (14)* | |
H2D | 0.292 (4) | 0.726 (4) | 0.093 (3) | 0.068 (9)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.1003 (6) | 0.0763 (6) | 0.0558 (5) | 0.0081 (4) | 0.0148 (4) | −0.0179 (3) |
O2 | 0.0845 (13) | 0.0497 (11) | 0.0657 (11) | −0.0018 (9) | 0.0210 (10) | −0.0186 (9) |
C15 | 0.0443 (11) | 0.0505 (12) | 0.0496 (11) | −0.0004 (9) | 0.0157 (9) | −0.0095 (9) |
C14 | 0.0550 (12) | 0.0418 (11) | 0.0503 (12) | 0.0017 (9) | 0.0146 (10) | −0.0067 (9) |
C13 | 0.0561 (13) | 0.0525 (13) | 0.0551 (12) | 0.0022 (10) | 0.0183 (10) | −0.0028 (10) |
C12 | 0.0469 (11) | 0.0555 (13) | 0.0485 (11) | −0.0001 (9) | 0.0142 (9) | −0.0107 (9) |
C11 | 0.0525 (12) | 0.0471 (12) | 0.0487 (11) | 0.0010 (9) | 0.0155 (9) | −0.0064 (9) |
C10 | 0.0485 (11) | 0.0472 (12) | 0.0572 (12) | −0.0019 (9) | 0.0197 (10) | −0.0134 (9) |
C9 | 0.0594 (13) | 0.0449 (12) | 0.0653 (14) | −0.0011 (10) | 0.0245 (11) | −0.0063 (10) |
C8 | 0.0670 (14) | 0.0505 (13) | 0.0484 (12) | 0.0005 (10) | 0.0144 (10) | −0.0097 (9) |
C7 | 0.0820 (15) | 0.0581 (13) | 0.0452 (11) | 0.0039 (11) | 0.0118 (10) | 0.0004 (9) |
O1 | 0.141 (2) | 0.0451 (11) | 0.0976 (15) | −0.0011 (11) | 0.0388 (14) | −0.0120 (10) |
C6 | 0.098 (2) | 0.0475 (14) | 0.0825 (19) | 0.0032 (13) | 0.0332 (17) | −0.0002 (13) |
C5 | 0.0849 (15) | 0.0702 (14) | 0.0555 (11) | 0.0096 (12) | 0.0121 (11) | 0.0049 (10) |
C4 | 0.0867 (19) | 0.0661 (16) | 0.0595 (14) | 0.0129 (13) | 0.0186 (13) | −0.0165 (12) |
C3 | 0.100 (2) | 0.0675 (17) | 0.0505 (13) | 0.0057 (15) | 0.0103 (13) | −0.0100 (12) |
C2 | 0.0847 (19) | 0.0693 (17) | 0.0667 (16) | −0.0170 (14) | 0.0193 (14) | −0.0210 (13) |
C1 | 0.0772 (18) | 0.097 (2) | 0.0504 (14) | 0.0074 (15) | 0.0124 (13) | −0.0067 (14) |
S1—C1 | 1.683 (3) | C8—C2 | 1.541 (4) |
S1—C12 | 1.716 (2) | C7—C5 | 1.432 (3) |
O2—C10 | 1.352 (3) | C7—H7 | 0.867 (10) |
O2—H2D | 0.78 (3) | O1—C6 | 1.230 (3) |
C15—C14 | 1.399 (3) | C6—H6A | 0.99 (4) |
C15—C10 | 1.402 (3) | C5—C1 | 1.339 (4) |
C15—C12 | 1.476 (3) | C5—H5A | 0.9500 |
C14—C11 | 1.391 (3) | C4—H4A | 0.9800 |
C14—H14A | 0.9500 | C4—H4B | 0.9800 |
C13—C11 | 1.374 (3) | C4—H4C | 0.9800 |
C13—C9 | 1.396 (3) | C3—H3A | 0.9800 |
C13—H13A | 0.9500 | C3—H3B | 0.9800 |
C12—C7 | 1.408 (3) | C3—H3C | 0.9800 |
C11—C8 | 1.544 (3) | C2—H2A | 0.9800 |
C10—C9 | 1.403 (3) | C2—H2B | 0.9800 |
C9—C6 | 1.457 (4) | C2—H2C | 0.9800 |
C8—C4 | 1.527 (4) | C1—H2 | 0.902 (10) |
C8—C3 | 1.530 (4) | ||
C1—S1—C12 | 92.60 (13) | C12—C7—H7 | 127 (3) |
C10—O2—H2D | 103 (2) | C5—C7—H7 | 122 (3) |
C14—C15—C10 | 116.7 (2) | O1—C6—C9 | 125.0 (3) |
C14—C15—C12 | 120.00 (19) | O1—C6—H6A | 111 (2) |
C10—C15—C12 | 123.30 (19) | C9—C6—H6A | 124 (3) |
C11—C14—C15 | 124.4 (2) | C1—C5—C7 | 113.4 (3) |
C11—C14—H14A | 117.8 | C1—C5—H5A | 123.3 |
C15—C14—H14A | 117.8 | C7—C5—H5A | 123.3 |
C11—C13—C9 | 121.2 (2) | C8—C4—H4A | 109.5 |
C11—C13—H13A | 119.4 | C8—C4—H4B | 109.5 |
C9—C13—H13A | 119.4 | H4A—C4—H4B | 109.5 |
C7—C12—C15 | 125.95 (19) | C8—C4—H4C | 109.5 |
C7—C12—S1 | 110.58 (17) | H4A—C4—H4C | 109.5 |
C15—C12—S1 | 123.46 (17) | H4B—C4—H4C | 109.5 |
C13—C11—C14 | 117.3 (2) | C8—C3—H3A | 109.5 |
C13—C11—C8 | 123.0 (2) | C8—C3—H3B | 109.5 |
C14—C11—C8 | 119.69 (19) | H3A—C3—H3B | 109.5 |
O2—C10—C15 | 118.8 (2) | C8—C3—H3C | 109.5 |
O2—C10—C9 | 121.1 (2) | H3A—C3—H3C | 109.5 |
C15—C10—C9 | 120.13 (19) | H3B—C3—H3C | 109.5 |
C13—C9—C10 | 120.3 (2) | C8—C2—H2A | 109.5 |
C13—C9—C6 | 119.3 (2) | C8—C2—H2B | 109.5 |
C10—C9—C6 | 120.3 (2) | H2A—C2—H2B | 109.5 |
C4—C8—C3 | 108.3 (2) | C8—C2—H2C | 109.5 |
C4—C8—C2 | 109.5 (2) | H2A—C2—H2C | 109.5 |
C3—C8—C2 | 108.3 (2) | H2B—C2—H2C | 109.5 |
C4—C8—C11 | 109.58 (19) | C5—C1—S1 | 112.9 (2) |
C3—C8—C11 | 111.9 (2) | C5—C1—H2 | 125 (2) |
C2—C8—C11 | 109.16 (19) | S1—C1—H2 | 122 (2) |
C12—C7—C5 | 110.5 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2D···O1 | 0.78 (3) | 1.89 (3) | 2.623 (3) | 157 (3) |
Experimental details
Crystal data | |
Chemical formula | C15H16O2S |
Mr | 260.34 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 173 |
a, b, c (Å) | 7.2016 (14), 8.9375 (18), 10.922 (2) |
α, β, γ (°) | 91.50 (3), 107.69 (3), 93.25 (3) |
V (Å3) | 668.0 (2) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.23 |
Crystal size (mm) | 0.10 × 0.10 × 0.10 |
Data collection | |
Diffractometer | Rigaku R-AXIS RAPID |
Absorption correction | Multi-scan (ABSCOR; Higashi, 1995) |
Tmin, Tmax | 0.977, 0.977 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 5891, 2705, 1958 |
Rint | 0.020 |
(sin θ/λ)max (Å−1) | 0.625 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.059, 0.208, 1.15 |
No. of reflections | 2705 |
No. of parameters | 179 |
No. of restraints | 9 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.41, −0.45 |
Computer programs: RAPID-AUTO (Rigaku, 1998), CrystalStructure (Rigaku/MSC, 2004), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).
D—H···A | D—H | H···A | D···A | D—H···A |
O2—H2D···O1 | 0.78 (3) | 1.89 (3) | 2.623 (3) | 157 (3) |
Acknowledgements
This project was sponsored by the Cultivation Program of Young and Middle-aged Academic Leaders in Zhejiang Higher Education Institutions, the Natural Science Foundation of Ningbo City (Nos. 2009 A610047 and 2010 A610027) and the K. C. Wong Magna Fund of Ningbo University. We thank Professor X. Li for help with the structural analysis.
References
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Salicylaldehyde and its derivatives are widely used in the construction of metal complexes (Qiu et al., 2009; Wang et al., 2009; Yu et al., 2007). We have synthesized a series of lanthanide complexes of a Schiff base which derived from 2-pyridyl salicylaldehyde and investigated their luminescent properties (Wong et al., 2004). In the course of exploring new luminescent compounds, we synthesized the title molecule 5-tert-butyl-2-hydroxy-3-thiophen-2-ylbenzaldehyde (I) as an intermediate compound.
The molecular structure of the title compound is shown in Fig. 1. The thiophene ring is essentially planar (rms deviation = 0.006Å for all non-H atoms) and roughly coplanar with the phenyl ring, making a dihedral angle between the mean planes of the rings of 4.35 (8)°. There are no intermolecular hydrogen bonds in the crystal structure but the intramolecular interaction O2—H2D···O1 between the hydroxy OH group and the aldehyde O atom is helpful to stabilize the molecular conformation.