organic compounds
3-[2-Hydroxy-3-(2,4,6-trimethylphenyl)propyl]-3-methyl-1-phenylthiourea
aDepartment of Organic Chemistry, Baku State University, Baku, Azerbaijan, and bDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia
*Correspondence e-mail: seikweng@um.edu.my
In the title compound, C20H26N2OS, four non-H atoms of the thiourea unit are approximately planar (r.m.s. deviation = 0.005 Å); the phenyl and benzene rings are twisted out of this plane by 28.55 (7) and 60.00 (7)°, respectively. An intramolecular N—H⋯O hydrogen bond occurs. The hydroxy group is hydrogen bonded to the double-bond S atom of an inversion-related molecule, generating a hydrogen-bonded dimer in the crystal structure.
Related literature
The title compund was prepared by a reaction of 1-methylamino-3-(2,4,6-trimethylphenyl)propan-2-ol and phenyl isothiocyanate; for the structure of the reactant 1-methylamino-3-(2,4,6-trimethylphenyl)propan-2-ol, see: Maharramov et al. (2011).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2005); cell SAINT (Bruker, 2005); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2010).
Supporting information
10.1107/S1600536811012736/xu5185sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536811012736/xu5185Isup2.hkl
1-Methylamino-3-(2,4,6-trimethylphenyl)propan-2-ol was synthesized as reported (Maharramov et al., 2011). The compound (10 mmol) and phenyl isothiocyanate (10 mmol) were heated in benzene (50 mol) for 10 h. The solvent was removed and the product recrystallized from ethanol to yield colorless crystals, m.p. 413–414 K; yield 90%.
Carbon-bound H-atoms were placed in calculated positions [C–H 0.95 to 1.00 Å; U(H) 1.2 to 1.5U(C)] and were included in the
in the riding model approximation.The hydroxy and amino H-atoms were located in a difference Fourier map, and were refined with distance restraints of O–H 0.84±0.01 and N–H 0.88±0.01 Å; their temperature factors were refined.
Data collection: APEX2 (Bruker, 2005); cell
SAINT (Bruker, 2005); data reduction: SAINT (Bruker, 2005); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: X-SEED (Barbour, 2001); software used to prepare material for publication: publCIF (Westrip, 2010).Fig. 1. Thermal ellipsoid plot (Barbour, 2001) of C20H26N2OS at the 70% probability level; hydrogen atoms are drawn as spheres of arbitrary radius. |
C20H26N2OS | F(000) = 736 |
Mr = 342.49 | Dx = 1.226 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 4968 reflections |
a = 14.6313 (11) Å | θ = 2.6–29.2° |
b = 8.1579 (6) Å | µ = 0.18 mm−1 |
c = 16.4455 (12) Å | T = 100 K |
β = 109.040 (1)° | Prism, colorless |
V = 1855.6 (2) Å3 | 0.30 × 0.20 × 0.20 mm |
Z = 4 |
Bruker SMART APEX diffractometer | 4160 independent reflections |
Radiation source: fine-focus sealed tube | 3542 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.028 |
ϕ and ω scans | θmax = 27.5°, θmin = 2.6° |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | h = −18→18 |
Tmin = 0.947, Tmax = 0.964 | k = −10→10 |
10052 measured reflections | l = −20→20 |
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)] = 0.039 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.112 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0617P)2 + 0.4837P] where P = (Fo2 + 2Fc2)/3 |
4160 reflections | (Δ/σ)max = 0.001 |
229 parameters | Δρmax = 0.38 e Å−3 |
2 restraints | Δρmin = −0.24 e Å−3 |
C20H26N2OS | V = 1855.6 (2) Å3 |
Mr = 342.49 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 14.6313 (11) Å | µ = 0.18 mm−1 |
b = 8.1579 (6) Å | T = 100 K |
c = 16.4455 (12) Å | 0.30 × 0.20 × 0.20 mm |
β = 109.040 (1)° |
Bruker SMART APEX diffractometer | 4160 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 1996) | 3542 reflections with I > 2σ(I) |
Tmin = 0.947, Tmax = 0.964 | Rint = 0.028 |
10052 measured reflections |
R[F2 > 2σ(F2)] = 0.039 | 2 restraints |
wR(F2) = 0.112 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | Δρmax = 0.38 e Å−3 |
4160 reflections | Δρmin = −0.24 e Å−3 |
229 parameters |
x | y | z | Uiso*/Ueq | ||
S1 | 0.35275 (3) | 0.49063 (4) | 0.61941 (2) | 0.02172 (11) | |
O1 | 0.61082 (7) | 0.26588 (12) | 0.52099 (7) | 0.0223 (2) | |
H1 | 0.6434 (13) | 0.330 (2) | 0.5027 (12) | 0.041 (6)* | |
N1 | 0.51088 (8) | 0.30365 (14) | 0.65553 (7) | 0.0197 (3) | |
N2 | 0.42327 (8) | 0.31882 (14) | 0.51317 (8) | 0.0196 (2) | |
H2 | 0.4785 (9) | 0.292 (2) | 0.5069 (12) | 0.032 (5)* | |
C1 | 0.81508 (10) | 0.13935 (16) | 0.59751 (10) | 0.0216 (3) | |
C2 | 0.89199 (11) | 0.21843 (18) | 0.65953 (10) | 0.0260 (3) | |
C3 | 0.97052 (11) | 0.2735 (2) | 0.63719 (12) | 0.0320 (4) | |
H3 | 1.0215 | 0.3293 | 0.6790 | 0.038* | |
C4 | 0.97654 (12) | 0.2495 (2) | 0.55560 (12) | 0.0340 (4) | |
C5 | 0.90094 (12) | 0.1692 (2) | 0.49568 (11) | 0.0319 (4) | |
H5 | 0.9043 | 0.1508 | 0.4397 | 0.038* | |
C6 | 0.82014 (11) | 0.11434 (18) | 0.51461 (10) | 0.0254 (3) | |
C7 | 0.89290 (13) | 0.2418 (2) | 0.75097 (11) | 0.0364 (4) | |
H7A | 0.9484 | 0.3098 | 0.7824 | 0.055* | |
H7B | 0.8979 | 0.1348 | 0.7792 | 0.055* | |
H7C | 0.8330 | 0.2961 | 0.7506 | 0.055* | |
C8 | 1.06343 (14) | 0.3063 (2) | 0.53256 (16) | 0.0496 (5) | |
H8A | 1.0423 | 0.3813 | 0.4834 | 0.074* | |
H8B | 1.0956 | 0.2112 | 0.5174 | 0.074* | |
H8C | 1.1087 | 0.3630 | 0.5819 | 0.074* | |
C9 | 0.74118 (12) | 0.0268 (2) | 0.44548 (11) | 0.0327 (4) | |
H9A | 0.7578 | 0.0233 | 0.3924 | 0.049* | |
H9B | 0.6800 | 0.0856 | 0.4348 | 0.049* | |
H9C | 0.7345 | −0.0852 | 0.4643 | 0.049* | |
C10 | 0.72773 (10) | 0.08517 (17) | 0.62059 (10) | 0.0223 (3) | |
H10A | 0.7491 | 0.0465 | 0.6810 | 0.027* | |
H10B | 0.6964 | −0.0080 | 0.5834 | 0.027* | |
C11 | 0.65378 (10) | 0.22347 (17) | 0.61007 (9) | 0.0195 (3) | |
H11 | 0.6861 | 0.3218 | 0.6435 | 0.023* | |
C12 | 0.57030 (10) | 0.16888 (16) | 0.64028 (9) | 0.0195 (3) | |
H12A | 0.5280 | 0.0943 | 0.5965 | 0.023* | |
H12B | 0.5971 | 0.1057 | 0.6942 | 0.023* | |
C13 | 0.54069 (11) | 0.36552 (19) | 0.74324 (9) | 0.0253 (3) | |
H13A | 0.5239 | 0.4819 | 0.7427 | 0.038* | |
H13B | 0.6107 | 0.3523 | 0.7697 | 0.038* | |
H13C | 0.5075 | 0.3040 | 0.7765 | 0.038* | |
C14 | 0.43142 (10) | 0.36483 (16) | 0.59459 (9) | 0.0175 (3) | |
C15 | 0.34745 (10) | 0.33743 (15) | 0.43473 (9) | 0.0177 (3) | |
C16 | 0.25039 (10) | 0.36157 (17) | 0.42568 (10) | 0.0228 (3) | |
H16 | 0.2307 | 0.3745 | 0.4749 | 0.027* | |
C17 | 0.18274 (11) | 0.36650 (18) | 0.34365 (10) | 0.0274 (3) | |
H17 | 0.1166 | 0.3841 | 0.3374 | 0.033* | |
C18 | 0.20929 (11) | 0.34643 (19) | 0.27106 (10) | 0.0280 (3) | |
H18 | 0.1619 | 0.3497 | 0.2155 | 0.034* | |
C19 | 0.30580 (11) | 0.32148 (18) | 0.28011 (9) | 0.0251 (3) | |
H19 | 0.3249 | 0.3065 | 0.2307 | 0.030* | |
C20 | 0.37432 (10) | 0.31839 (16) | 0.36127 (9) | 0.0212 (3) | |
H20 | 0.4405 | 0.3031 | 0.3671 | 0.025* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0242 (2) | 0.02255 (18) | 0.0209 (2) | 0.00347 (13) | 0.01083 (14) | 0.00010 (13) |
O1 | 0.0211 (5) | 0.0255 (5) | 0.0227 (5) | 0.0022 (4) | 0.0102 (4) | 0.0086 (4) |
N1 | 0.0209 (6) | 0.0219 (6) | 0.0169 (6) | 0.0021 (4) | 0.0072 (5) | 0.0012 (4) |
N2 | 0.0176 (6) | 0.0247 (6) | 0.0176 (6) | 0.0025 (5) | 0.0074 (5) | 0.0004 (5) |
C1 | 0.0210 (7) | 0.0185 (6) | 0.0264 (7) | 0.0061 (5) | 0.0092 (6) | 0.0057 (5) |
C2 | 0.0215 (7) | 0.0253 (7) | 0.0294 (8) | 0.0078 (6) | 0.0056 (6) | 0.0039 (6) |
C3 | 0.0195 (7) | 0.0279 (8) | 0.0450 (10) | 0.0049 (6) | 0.0057 (7) | 0.0036 (7) |
C4 | 0.0255 (8) | 0.0285 (8) | 0.0531 (11) | 0.0098 (6) | 0.0196 (7) | 0.0149 (7) |
C5 | 0.0342 (9) | 0.0333 (8) | 0.0348 (9) | 0.0116 (7) | 0.0203 (7) | 0.0108 (7) |
C6 | 0.0267 (8) | 0.0221 (7) | 0.0285 (8) | 0.0090 (6) | 0.0105 (6) | 0.0062 (6) |
C7 | 0.0317 (9) | 0.0433 (10) | 0.0289 (9) | 0.0076 (7) | 0.0029 (7) | −0.0013 (7) |
C8 | 0.0328 (10) | 0.0438 (11) | 0.0815 (16) | 0.0091 (8) | 0.0315 (10) | 0.0224 (10) |
C9 | 0.0361 (9) | 0.0370 (9) | 0.0247 (8) | 0.0071 (7) | 0.0096 (7) | −0.0018 (7) |
C10 | 0.0236 (7) | 0.0190 (6) | 0.0257 (7) | 0.0040 (5) | 0.0101 (6) | 0.0064 (5) |
C11 | 0.0198 (7) | 0.0193 (6) | 0.0201 (7) | 0.0017 (5) | 0.0074 (5) | 0.0045 (5) |
C12 | 0.0197 (7) | 0.0186 (6) | 0.0211 (7) | 0.0013 (5) | 0.0080 (5) | 0.0039 (5) |
C13 | 0.0280 (8) | 0.0306 (8) | 0.0167 (7) | −0.0006 (6) | 0.0064 (6) | −0.0002 (6) |
C14 | 0.0192 (7) | 0.0162 (6) | 0.0188 (7) | −0.0029 (5) | 0.0086 (5) | 0.0009 (5) |
C15 | 0.0200 (7) | 0.0148 (6) | 0.0183 (7) | −0.0014 (5) | 0.0061 (5) | −0.0005 (5) |
C16 | 0.0215 (7) | 0.0233 (7) | 0.0246 (7) | −0.0015 (5) | 0.0089 (6) | −0.0005 (6) |
C17 | 0.0185 (7) | 0.0290 (8) | 0.0315 (8) | −0.0016 (6) | 0.0039 (6) | 0.0005 (6) |
C18 | 0.0272 (8) | 0.0293 (8) | 0.0218 (8) | −0.0048 (6) | 0.0000 (6) | 0.0012 (6) |
C19 | 0.0311 (8) | 0.0259 (7) | 0.0177 (7) | −0.0043 (6) | 0.0070 (6) | −0.0006 (6) |
C20 | 0.0220 (7) | 0.0207 (6) | 0.0220 (7) | −0.0019 (5) | 0.0086 (6) | −0.0011 (5) |
S1—C14 | 1.6885 (14) | C8—H8C | 0.9800 |
O1—C11 | 1.4353 (17) | C9—H9A | 0.9800 |
O1—H1 | 0.826 (9) | C9—H9B | 0.9800 |
N1—C14 | 1.3583 (17) | C9—H9C | 0.9800 |
N1—C13 | 1.4544 (18) | C10—C11 | 1.5333 (19) |
N1—C12 | 1.4730 (17) | C10—H10A | 0.9900 |
N2—C14 | 1.3578 (18) | C10—H10B | 0.9900 |
N2—C15 | 1.4086 (17) | C11—C12 | 1.5275 (19) |
N2—H2 | 0.875 (9) | C11—H11 | 1.0000 |
C1—C6 | 1.404 (2) | C12—H12A | 0.9900 |
C1—C2 | 1.405 (2) | C12—H12B | 0.9900 |
C1—C10 | 1.5130 (19) | C13—H13A | 0.9800 |
C2—C3 | 1.390 (2) | C13—H13B | 0.9800 |
C2—C7 | 1.512 (2) | C13—H13C | 0.9800 |
C3—C4 | 1.387 (3) | C15—C16 | 1.393 (2) |
C3—H3 | 0.9500 | C15—C20 | 1.396 (2) |
C4—C5 | 1.383 (3) | C16—C17 | 1.389 (2) |
C4—C8 | 1.513 (2) | C16—H16 | 0.9500 |
C5—C6 | 1.391 (2) | C17—C18 | 1.380 (2) |
C5—H5 | 0.9500 | C17—H17 | 0.9500 |
C6—C9 | 1.510 (2) | C18—C19 | 1.386 (2) |
C7—H7A | 0.9800 | C18—H18 | 0.9500 |
C7—H7B | 0.9800 | C19—C20 | 1.3835 (19) |
C7—H7C | 0.9800 | C19—H19 | 0.9500 |
C8—H8A | 0.9800 | C20—H20 | 0.9500 |
C8—H8B | 0.9800 | ||
C11—O1—H1 | 114.3 (14) | C1—C10—H10A | 109.1 |
C14—N1—C13 | 120.79 (12) | C11—C10—H10A | 109.1 |
C14—N1—C12 | 124.00 (12) | C1—C10—H10B | 109.1 |
C13—N1—C12 | 115.16 (11) | C11—C10—H10B | 109.1 |
C14—N2—C15 | 131.51 (12) | H10A—C10—H10B | 107.9 |
C14—N2—H2 | 113.4 (12) | O1—C11—C12 | 105.77 (11) |
C15—N2—H2 | 113.7 (12) | O1—C11—C10 | 110.52 (11) |
C6—C1—C2 | 119.22 (14) | C12—C11—C10 | 111.01 (11) |
C6—C1—C10 | 121.17 (13) | O1—C11—H11 | 109.8 |
C2—C1—C10 | 119.61 (13) | C12—C11—H11 | 109.8 |
C3—C2—C1 | 119.47 (15) | C10—C11—H11 | 109.8 |
C3—C2—C7 | 118.83 (15) | N1—C12—C11 | 114.64 (11) |
C1—C2—C7 | 121.68 (14) | N1—C12—H12A | 108.6 |
C4—C3—C2 | 121.91 (16) | C11—C12—H12A | 108.6 |
C4—C3—H3 | 119.0 | N1—C12—H12B | 108.6 |
C2—C3—H3 | 119.0 | C11—C12—H12B | 108.6 |
C5—C4—C3 | 117.90 (15) | H12A—C12—H12B | 107.6 |
C5—C4—C8 | 120.58 (17) | N1—C13—H13A | 109.5 |
C3—C4—C8 | 121.51 (18) | N1—C13—H13B | 109.5 |
C4—C5—C6 | 122.24 (16) | H13A—C13—H13B | 109.5 |
C4—C5—H5 | 118.9 | N1—C13—H13C | 109.5 |
C6—C5—H5 | 118.9 | H13A—C13—H13C | 109.5 |
C5—C6—C1 | 119.24 (15) | H13B—C13—H13C | 109.5 |
C5—C6—C9 | 118.75 (15) | N2—C14—N1 | 113.87 (12) |
C1—C6—C9 | 122.01 (14) | N2—C14—S1 | 123.98 (10) |
C2—C7—H7A | 109.5 | N1—C14—S1 | 122.12 (10) |
C2—C7—H7B | 109.5 | C16—C15—C20 | 119.25 (13) |
H7A—C7—H7B | 109.5 | C16—C15—N2 | 125.74 (13) |
C2—C7—H7C | 109.5 | C20—C15—N2 | 114.87 (12) |
H7A—C7—H7C | 109.5 | C17—C16—C15 | 119.10 (14) |
H7B—C7—H7C | 109.5 | C17—C16—H16 | 120.4 |
C4—C8—H8A | 109.5 | C15—C16—H16 | 120.4 |
C4—C8—H8B | 109.5 | C18—C17—C16 | 121.61 (14) |
H8A—C8—H8B | 109.5 | C18—C17—H17 | 119.2 |
C4—C8—H8C | 109.5 | C16—C17—H17 | 119.2 |
H8A—C8—H8C | 109.5 | C17—C18—C19 | 119.26 (14) |
H8B—C8—H8C | 109.5 | C17—C18—H18 | 120.4 |
C6—C9—H9A | 109.5 | C19—C18—H18 | 120.4 |
C6—C9—H9B | 109.5 | C20—C19—C18 | 119.91 (14) |
H9A—C9—H9B | 109.5 | C20—C19—H19 | 120.0 |
C6—C9—H9C | 109.5 | C18—C19—H19 | 120.0 |
H9A—C9—H9C | 109.5 | C19—C20—C15 | 120.85 (13) |
H9B—C9—H9C | 109.5 | C19—C20—H20 | 119.6 |
C1—C10—C11 | 112.30 (11) | C15—C20—H20 | 119.6 |
C6—C1—C2—C3 | 1.4 (2) | C14—N1—C12—C11 | 90.19 (16) |
C10—C1—C2—C3 | −177.61 (13) | C13—N1—C12—C11 | −92.18 (14) |
C6—C1—C2—C7 | −177.09 (13) | O1—C11—C12—N1 | −76.40 (14) |
C10—C1—C2—C7 | 3.9 (2) | C10—C11—C12—N1 | 163.70 (12) |
C1—C2—C3—C4 | −1.5 (2) | C15—N2—C14—N1 | 170.80 (13) |
C7—C2—C3—C4 | 177.01 (14) | C15—N2—C14—S1 | −10.8 (2) |
C2—C3—C4—C5 | 0.5 (2) | C13—N1—C14—N2 | 167.94 (12) |
C2—C3—C4—C8 | −178.50 (15) | C12—N1—C14—N2 | −14.56 (18) |
C3—C4—C5—C6 | 0.6 (2) | C13—N1—C14—S1 | −10.48 (18) |
C8—C4—C5—C6 | 179.65 (15) | C12—N1—C14—S1 | 167.02 (10) |
C4—C5—C6—C1 | −0.7 (2) | C14—N2—C15—C16 | −22.3 (2) |
C4—C5—C6—C9 | −179.63 (14) | C14—N2—C15—C20 | 162.14 (13) |
C2—C1—C6—C5 | −0.3 (2) | C20—C15—C16—C17 | −0.2 (2) |
C10—C1—C6—C5 | 178.68 (13) | N2—C15—C16—C17 | −175.56 (13) |
C2—C1—C6—C9 | 178.57 (13) | C15—C16—C17—C18 | 0.7 (2) |
C10—C1—C6—C9 | −2.4 (2) | C16—C17—C18—C19 | −0.3 (2) |
C6—C1—C10—C11 | −94.33 (16) | C17—C18—C19—C20 | −0.6 (2) |
C2—C1—C10—C11 | 84.66 (16) | C18—C19—C20—C15 | 1.1 (2) |
C1—C10—C11—O1 | 67.26 (15) | C16—C15—C20—C19 | −0.7 (2) |
C1—C10—C11—C12 | −175.70 (12) | N2—C15—C20—C19 | 175.19 (12) |
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···S1i | 0.83 (1) | 2.50 (1) | 3.219 (1) | 146 (2) |
N2—H2···O1 | 0.88 (1) | 1.89 (1) | 2.739 (2) | 165 (2) |
Symmetry code: (i) −x+1, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C20H26N2OS |
Mr | 342.49 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 100 |
a, b, c (Å) | 14.6313 (11), 8.1579 (6), 16.4455 (12) |
β (°) | 109.040 (1) |
V (Å3) | 1855.6 (2) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.18 |
Crystal size (mm) | 0.30 × 0.20 × 0.20 |
Data collection | |
Diffractometer | Bruker SMART APEX diffractometer |
Absorption correction | Multi-scan (SADABS; Sheldrick, 1996) |
Tmin, Tmax | 0.947, 0.964 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 10052, 4160, 3542 |
Rint | 0.028 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.039, 0.112, 1.04 |
No. of reflections | 4160 |
No. of parameters | 229 |
No. of restraints | 2 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.38, −0.24 |
Computer programs: APEX2 (Bruker, 2005), SAINT (Bruker, 2005), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), X-SEED (Barbour, 2001), publCIF (Westrip, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
O1—H1···S1i | 0.83 (1) | 2.50 (1) | 3.219 (1) | 146 (2) |
N2—H2···O1 | 0.88 (1) | 1.89 (1) | 2.739 (2) | 165 (2) |
Symmetry code: (i) −x+1, −y+1, −z+1. |
Acknowledgements
We thank Baku State University and the University of Malaya for supporting this study.
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We have recently reported the synthesis and crystal structure of 1-methylamino-3-(2,4,6-trimethylphenyl)propan-2-ol (Maharramov et al., 2011). This secondary amine behaves like a conventional secondary amine in its reaction with phenyl isothiocyanate to furnish a thiourea (Scheme I). The four-atoms N–C(═S)–N unit of C20H26N2OS is planar [r.m.s. deviation 0.005 Å]; the phenyl ring connected to one of the two flanking N atoms is twisted out of this plane 28.6 (1)° (Fig. 1). The propyl chain connected to the other N atom bears a hydroxy substituent; this serves as hydrogen-bond donor acceptor to the double-bond S atom of an inversion-related molecule to generate a hydrogen-bonded dimer.