organic compounds
2-[4-(Morpholin-4-ylmethyl)phenyl]benzonitrile
aDepartment of Studies in Chemistry, Karnataka University, Dharwad 580 003, Karnataka, India, and bDepartment of Physics, Yuvaraja's College (Constituent College), University of Mysore, Mysore 570 005, Karnataka, India
*Correspondence e-mail: devarajegowda@yahoo.com, kamchem9@gmail.com
In the title compound, C18H18N2O, the morpholine ring adopts a chair conformation with the exocyclic N—C bond in an equatorial orientation. The dihedral angles between the central benzene ring and the morpholine ring (all atoms) and the cyanobenzene ring are 87.87 (7) and 52.54 (7)°, respectively. No significant intermolecular interactions are observed in the crystal structure.
Related literature
For biological applications of biphenyl derivatives see; Li et al. (2011); Hadizad et al. (2009); Larsen et al. (1994); Kamble et al. (2011); Zhang et al. (2004); Chan et al. (1994).
Experimental
Crystal data
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Data collection: SMART (Bruker, 2001); cell SAINT (Bruker, 2001); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 2012); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536812050957/hb7014sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536812050957/hb7014Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536812050957/hb7014Isup3.cml
A mixture of 4'-(bromomethyl)-biphenyl-2-carbonitrile (0.0074 mol), morpholine (0.0085 mol) in presence of potassium carbonate (0.009 mol) in acetone (20 ml) was stirred at 298–300 K for 5–6hrs, filtred the salt, filtrate added to 50 ml water stirred well to get solid, filtered and washed with water, dried at 313 K. Colourless plates were recrystallized from a solvent mixture of acetone and THF (m.p. 348 K).
All H atoms were positioned geometrically, with C—H = 0.93 Å for aromatic H and C—H = 0.97 Å for methylene H and refined using a riding model with Uiso(H) = 1.2Ueq(C) for aromatic and methylene H.
Biphenyl derivatives were reported as non-peptide AII antagonists by the discovery at Du-pont Merck which resulted into clinical candidate (5–2-[(4-methyl)-biphenyl]-1H-tetrazole. This has become the common motif for most of the potent antagonists reported (Li et al., 2011; Hadizad et al., 2009; Larsen et al., 1994). This discovery lead to the development of drugs such as irbesartan and losartan for the efficient treatment of hypertension. Since then these biphenyl derivatives have received enormous focus due to their inhibition of angiotensin converting enzyme (ACE) and in this regard many biphenyl derivatives have been reported (Kamble et al., 2011; Zhang et al., 2004; Chan et al., 1994).
The
of 4'-(morpholin-4-ylmethyl)biphenyl-2-carbonitrile is shown in Fig. 1. The the morpholine ring (O1/N2/C4–C7)adopts a chair conformation. The dihedral angle between the morpholine ring (O1/N2/C4–C7) and the benzene rings (C9–C14) and (C15–C20) are 87.87 (7)° and 44.76 (7)° respectively. No significant intermolecular interactions are observed. The crystal packing of the molecules is shown in Fig.2.For biological applications of biphenyl derivatives see; Li et al. (2011); Hadizad et al. (2009); Larsen et al. (1994); Kamble et al. (2011); Zhang et al. (2004); Chan et al. (1994).
Data collection: SMART (Bruker, 2001); cell
SAINT (Bruker, 2001); data reduction: SAINT (Bruker, 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 2012); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C18H18N2O | F(000) = 592 |
Mr = 278.34 | Dx = 1.207 Mg m−3 |
Monoclinic, P21/c | Melting point: 348 K |
Hall symbol: -P 2ybc | Mo Kα radiation, λ = 0.71073 Å |
a = 21.1079 (5) Å | Cell parameters from 2387 reflections |
b = 8.1358 (1) Å | θ = 2.7–24.1° |
c = 9.0793 (2) Å | µ = 0.08 mm−1 |
β = 100.833 (1)° | T = 296 K |
V = 1531.40 (5) Å3 | Plate, colourless |
Z = 4 | 0.24 × 0.20 × 0.12 mm |
Bruker SMART CCD diffractometer | 2387 independent reflections |
Radiation source: fine-focus sealed tube | 1948 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.021 |
ω and φ scans | θmax = 24.1°, θmin = 2.7° |
Absorption correction: multi-scan (SADABS; Sheldrick, 2007) | h = −18→24 |
Tmin = 0.770, Tmax = 1.000 | k = −9→9 |
10319 measured reflections | l = −10→10 |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.033 | H-atom parameters constrained |
wR(F2) = 0.083 | w = 1/[σ2(Fo2) + (0.0398P)2 + 0.1412P] where P = (Fo2 + 2Fc2)/3 |
S = 1.03 | (Δ/σ)max < 0.001 |
2387 reflections | Δρmax = 0.11 e Å−3 |
191 parameters | Δρmin = −0.10 e Å−3 |
0 restraints | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0110 (13) |
C18H18N2O | V = 1531.40 (5) Å3 |
Mr = 278.34 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 21.1079 (5) Å | µ = 0.08 mm−1 |
b = 8.1358 (1) Å | T = 296 K |
c = 9.0793 (2) Å | 0.24 × 0.20 × 0.12 mm |
β = 100.833 (1)° |
Bruker SMART CCD diffractometer | 2387 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2007) | 1948 reflections with I > 2σ(I) |
Tmin = 0.770, Tmax = 1.000 | Rint = 0.021 |
10319 measured reflections |
R[F2 > 2σ(F2)] = 0.033 | 0 restraints |
wR(F2) = 0.083 | H-atom parameters constrained |
S = 1.03 | Δρmax = 0.11 e Å−3 |
2387 reflections | Δρmin = −0.10 e Å−3 |
191 parameters |
Experimental. Spectroscopic data IR (KBr): 3040–3080, 2175, 1500, 1H NMR (300 MHz, CDCl3, δ p.p.m..): 2.93 (t,4H, Morpholine CH2), 3.8 (s, 2H, CH2), 3.94 (t, 4H, morpholine CH2), 7.42- 7.84 (m, 8H, ArH). MS (m/z, 70 eV): 278, 250, 192. |
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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 > 2σ(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 | 0.05263 (6) | 0.66354 (15) | 0.88307 (13) | 0.0926 (4) | |
N2 | 0.11430 (4) | 0.39688 (12) | 0.76422 (10) | 0.0462 (3) | |
N3 | 0.42812 (7) | 0.18166 (17) | 1.11979 (17) | 0.0859 (4) | |
C4 | 0.10594 (8) | 0.5807 (2) | 0.96979 (18) | 0.0835 (5) | |
H4A | 0.0904 | 0.4927 | 1.0258 | 0.100* | |
H4B | 0.1302 | 0.6568 | 1.0412 | 0.100* | |
C5 | 0.14930 (6) | 0.51072 (17) | 0.87289 (15) | 0.0584 (4) | |
H5A | 0.1667 | 0.5991 | 0.8209 | 0.070* | |
H5B | 0.1851 | 0.4541 | 0.9351 | 0.070* | |
C6 | 0.05896 (6) | 0.48231 (17) | 0.67698 (15) | 0.0585 (4) | |
H6A | 0.0337 | 0.4060 | 0.6075 | 0.070* | |
H6B | 0.0739 | 0.5695 | 0.6191 | 0.070* | |
C7 | 0.01763 (7) | 0.5536 (2) | 0.7778 (2) | 0.0789 (5) | |
H7A | −0.0185 | 0.6112 | 0.7178 | 0.095* | |
H7B | 0.0005 | 0.4654 | 0.8306 | 0.095* | |
C8 | 0.15600 (7) | 0.33485 (18) | 0.66566 (14) | 0.0583 (4) | |
H8A | 0.1782 | 0.4270 | 0.6304 | 0.070* | |
H8B | 0.1293 | 0.2843 | 0.5788 | 0.070* | |
C9 | 0.20548 (6) | 0.21152 (16) | 0.73752 (13) | 0.0504 (3) | |
C10 | 0.18769 (6) | 0.07434 (16) | 0.81104 (13) | 0.0523 (3) | |
H10 | 0.1448 | 0.0608 | 0.8197 | 0.063* | |
C11 | 0.23247 (6) | −0.04191 (16) | 0.87128 (13) | 0.0507 (3) | |
H11 | 0.2193 | −0.1331 | 0.9194 | 0.061* | |
C12 | 0.29698 (6) | −0.02548 (15) | 0.86153 (14) | 0.0491 (3) | |
C13 | 0.31476 (6) | 0.11113 (16) | 0.78798 (15) | 0.0582 (4) | |
H13 | 0.3577 | 0.1251 | 0.7798 | 0.070* | |
C14 | 0.26966 (6) | 0.22674 (17) | 0.72675 (15) | 0.0585 (4) | |
H14 | 0.2827 | 0.3170 | 0.6771 | 0.070* | |
C15 | 0.34412 (6) | −0.15362 (15) | 0.92802 (15) | 0.0527 (3) | |
C16 | 0.40058 (6) | −0.11543 (16) | 1.02980 (16) | 0.0566 (4) | |
C17 | 0.44281 (7) | −0.23758 (18) | 1.09399 (18) | 0.0706 (4) | |
H17 | 0.4801 | −0.2099 | 1.1615 | 0.085* | |
C18 | 0.42949 (8) | −0.39895 (19) | 1.0579 (2) | 0.0776 (5) | |
H18 | 0.4578 | −0.4810 | 1.1006 | 0.093* | |
C19 | 0.37458 (8) | −0.43904 (18) | 0.9591 (2) | 0.0789 (5) | |
H19 | 0.3655 | −0.5487 | 0.9351 | 0.095* | |
C20 | 0.33248 (7) | −0.31866 (17) | 0.89470 (18) | 0.0687 (4) | |
H20 | 0.2954 | −0.3486 | 0.8274 | 0.082* | |
C21 | 0.41517 (6) | 0.05194 (18) | 1.07696 (17) | 0.0633 (4) |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0948 (8) | 0.0848 (8) | 0.0920 (8) | 0.0435 (7) | 0.0019 (7) | −0.0129 (6) |
N2 | 0.0412 (6) | 0.0469 (6) | 0.0480 (6) | 0.0037 (4) | 0.0018 (4) | 0.0029 (4) |
N3 | 0.0726 (9) | 0.0598 (9) | 0.1148 (11) | −0.0027 (7) | −0.0098 (8) | −0.0077 (8) |
C4 | 0.0912 (12) | 0.0866 (11) | 0.0668 (9) | 0.0383 (9) | −0.0004 (9) | −0.0144 (9) |
C5 | 0.0537 (8) | 0.0582 (8) | 0.0572 (8) | 0.0045 (6) | −0.0051 (6) | −0.0016 (6) |
C6 | 0.0477 (7) | 0.0567 (8) | 0.0651 (8) | 0.0028 (6) | −0.0051 (6) | 0.0076 (7) |
C7 | 0.0517 (9) | 0.0840 (12) | 0.0987 (12) | 0.0207 (8) | 0.0079 (8) | 0.0104 (10) |
C8 | 0.0629 (8) | 0.0654 (9) | 0.0447 (7) | 0.0125 (7) | 0.0054 (6) | 0.0041 (6) |
C9 | 0.0529 (8) | 0.0578 (8) | 0.0394 (6) | 0.0078 (6) | 0.0062 (5) | −0.0035 (6) |
C10 | 0.0434 (7) | 0.0646 (8) | 0.0488 (7) | 0.0043 (6) | 0.0081 (6) | −0.0036 (6) |
C11 | 0.0491 (7) | 0.0507 (7) | 0.0525 (7) | −0.0014 (6) | 0.0101 (6) | −0.0021 (6) |
C12 | 0.0475 (7) | 0.0463 (7) | 0.0529 (7) | 0.0029 (6) | 0.0079 (6) | −0.0050 (6) |
C13 | 0.0453 (7) | 0.0593 (8) | 0.0710 (8) | 0.0027 (6) | 0.0137 (6) | 0.0035 (7) |
C14 | 0.0578 (9) | 0.0567 (8) | 0.0618 (8) | 0.0030 (7) | 0.0132 (7) | 0.0087 (7) |
C15 | 0.0488 (7) | 0.0467 (7) | 0.0638 (8) | 0.0037 (6) | 0.0139 (6) | −0.0009 (6) |
C16 | 0.0466 (8) | 0.0482 (8) | 0.0746 (9) | 0.0051 (6) | 0.0106 (7) | 0.0021 (7) |
C17 | 0.0530 (8) | 0.0618 (9) | 0.0932 (11) | 0.0106 (7) | 0.0044 (8) | 0.0069 (8) |
C18 | 0.0693 (10) | 0.0554 (9) | 0.1073 (12) | 0.0191 (8) | 0.0140 (9) | 0.0113 (9) |
C19 | 0.0840 (11) | 0.0446 (8) | 0.1079 (12) | 0.0080 (8) | 0.0171 (10) | −0.0030 (8) |
C20 | 0.0637 (9) | 0.0522 (9) | 0.0874 (10) | 0.0010 (7) | 0.0070 (8) | −0.0079 (8) |
C21 | 0.0458 (8) | 0.0573 (9) | 0.0821 (10) | 0.0039 (7) | −0.0003 (7) | 0.0027 (8) |
O1—C7 | 1.4120 (19) | C10—C11 | 1.3758 (17) |
O1—C4 | 1.4169 (18) | C10—H10 | 0.9300 |
N2—C5 | 1.4502 (16) | C11—C12 | 1.3873 (17) |
N2—C8 | 1.4581 (16) | C11—H11 | 0.9300 |
N2—C6 | 1.4585 (15) | C12—C13 | 1.3843 (18) |
N3—C21 | 1.1401 (18) | C12—C15 | 1.4886 (18) |
C4—C5 | 1.496 (2) | C13—C14 | 1.3788 (18) |
C4—H4A | 0.9700 | C13—H13 | 0.9300 |
C4—H4B | 0.9700 | C14—H14 | 0.9300 |
C5—H5A | 0.9700 | C15—C20 | 1.3881 (19) |
C5—H5B | 0.9700 | C15—C16 | 1.3989 (18) |
C6—C7 | 1.495 (2) | C16—C17 | 1.3880 (18) |
C6—H6A | 0.9700 | C16—C21 | 1.443 (2) |
C6—H6B | 0.9700 | C17—C18 | 1.369 (2) |
C7—H7A | 0.9700 | C17—H17 | 0.9300 |
C7—H7B | 0.9700 | C18—C19 | 1.365 (2) |
C8—C9 | 1.5057 (17) | C18—H18 | 0.9300 |
C8—H8A | 0.9700 | C19—C20 | 1.377 (2) |
C8—H8B | 0.9700 | C19—H19 | 0.9300 |
C9—C14 | 1.3819 (18) | C20—H20 | 0.9300 |
C9—C10 | 1.3879 (18) | ||
C7—O1—C4 | 109.55 (11) | C10—C9—C8 | 121.06 (12) |
C5—N2—C8 | 110.46 (10) | C11—C10—C9 | 121.07 (12) |
C5—N2—C6 | 108.59 (10) | C11—C10—H10 | 119.5 |
C8—N2—C6 | 110.24 (9) | C9—C10—H10 | 119.5 |
O1—C4—C5 | 111.35 (12) | C10—C11—C12 | 121.17 (12) |
O1—C4—H4A | 109.4 | C10—C11—H11 | 119.4 |
C5—C4—H4A | 109.4 | C12—C11—H11 | 119.4 |
O1—C4—H4B | 109.4 | C13—C12—C11 | 117.81 (12) |
C5—C4—H4B | 109.4 | C13—C12—C15 | 122.46 (11) |
H4A—C4—H4B | 108.0 | C11—C12—C15 | 119.73 (11) |
N2—C5—C4 | 110.69 (12) | C14—C13—C12 | 120.86 (12) |
N2—C5—H5A | 109.5 | C14—C13—H13 | 119.6 |
C4—C5—H5A | 109.5 | C12—C13—H13 | 119.6 |
N2—C5—H5B | 109.5 | C13—C14—C9 | 121.47 (13) |
C4—C5—H5B | 109.5 | C13—C14—H14 | 119.3 |
H5A—C5—H5B | 108.1 | C9—C14—H14 | 119.3 |
N2—C6—C7 | 110.63 (11) | C20—C15—C16 | 116.92 (12) |
N2—C6—H6A | 109.5 | C20—C15—C12 | 120.77 (12) |
C7—C6—H6A | 109.5 | C16—C15—C12 | 122.27 (11) |
N2—C6—H6B | 109.5 | C17—C16—C15 | 121.23 (13) |
C7—C6—H6B | 109.5 | C17—C16—C21 | 117.81 (13) |
H6A—C6—H6B | 108.1 | C15—C16—C21 | 120.89 (11) |
O1—C7—C6 | 111.65 (12) | C18—C17—C16 | 119.94 (15) |
O1—C7—H7A | 109.3 | C18—C17—H17 | 120.0 |
C6—C7—H7A | 109.3 | C16—C17—H17 | 120.0 |
O1—C7—H7B | 109.3 | C19—C18—C17 | 119.81 (14) |
C6—C7—H7B | 109.3 | C19—C18—H18 | 120.1 |
H7A—C7—H7B | 108.0 | C17—C18—H18 | 120.1 |
N2—C8—C9 | 114.47 (10) | C18—C19—C20 | 120.64 (14) |
N2—C8—H8A | 108.6 | C18—C19—H19 | 119.7 |
C9—C8—H8A | 108.6 | C20—C19—H19 | 119.7 |
N2—C8—H8B | 108.6 | C19—C20—C15 | 121.46 (14) |
C9—C8—H8B | 108.6 | C19—C20—H20 | 119.3 |
H8A—C8—H8B | 107.6 | C15—C20—H20 | 119.3 |
C14—C9—C10 | 117.62 (12) | N3—C21—C16 | 177.11 (16) |
C14—C9—C8 | 121.26 (12) | ||
C7—O1—C4—C5 | 58.34 (19) | C10—C9—C14—C13 | −0.67 (19) |
C8—N2—C5—C4 | 177.40 (11) | C8—C9—C14—C13 | −177.75 (12) |
C6—N2—C5—C4 | 56.40 (14) | C13—C12—C15—C20 | −128.35 (15) |
O1—C4—C5—N2 | −58.71 (18) | C11—C12—C15—C20 | 51.08 (18) |
C5—N2—C6—C7 | −56.05 (15) | C13—C12—C15—C16 | 53.85 (18) |
C8—N2—C6—C7 | −177.18 (12) | C11—C12—C15—C16 | −126.71 (14) |
C4—O1—C7—C6 | −58.19 (17) | C20—C15—C16—C17 | 0.0 (2) |
N2—C6—C7—O1 | 58.11 (16) | C12—C15—C16—C17 | 177.92 (13) |
C5—N2—C8—C9 | 73.85 (14) | C20—C15—C16—C21 | −176.91 (13) |
C6—N2—C8—C9 | −166.14 (11) | C12—C15—C16—C21 | 1.0 (2) |
N2—C8—C9—C14 | −130.98 (13) | C15—C16—C17—C18 | 0.0 (2) |
N2—C8—C9—C10 | 52.04 (16) | C21—C16—C17—C18 | 177.05 (15) |
C14—C9—C10—C11 | 0.17 (18) | C16—C17—C18—C19 | −0.2 (3) |
C8—C9—C10—C11 | 177.25 (11) | C17—C18—C19—C20 | 0.3 (3) |
C9—C10—C11—C12 | 0.45 (18) | C18—C19—C20—C15 | −0.2 (2) |
C10—C11—C12—C13 | −0.56 (18) | C16—C15—C20—C19 | 0.1 (2) |
C10—C11—C12—C15 | 179.98 (11) | C12—C15—C20—C19 | −177.84 (13) |
C11—C12—C13—C14 | 0.05 (19) | C17—C16—C21—N3 | −25 (3) |
C15—C12—C13—C14 | 179.50 (12) | C15—C16—C21—N3 | 152 (3) |
C12—C13—C14—C9 | 0.6 (2) |
Experimental details
Crystal data | |
Chemical formula | C18H18N2O |
Mr | 278.34 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 296 |
a, b, c (Å) | 21.1079 (5), 8.1358 (1), 9.0793 (2) |
β (°) | 100.833 (1) |
V (Å3) | 1531.40 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.08 |
Crystal size (mm) | 0.24 × 0.20 × 0.12 |
Data collection | |
Diffractometer | Bruker SMART CCD |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2007) |
Tmin, Tmax | 0.770, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 10319, 2387, 1948 |
Rint | 0.021 |
(sin θ/λ)max (Å−1) | 0.575 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.033, 0.083, 1.03 |
No. of reflections | 2387 |
No. of parameters | 191 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.11, −0.10 |
Computer programs: SMART (Bruker, 2001), SAINT (Bruker, 2001), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 2012).
Acknowledgements
The authors thank the Universities Sophisticated Instrumental Centre, Karnatak University, Dharwad, for the data collection. The authors are also grateful to University Grants Commission, New Delhi for financial assistance [letter No. 37-248/2009 (SR)].
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Biphenyl derivatives were reported as non-peptide AII antagonists by the discovery at Du-pont Merck which resulted into clinical candidate (5–2-[(4-methyl)-biphenyl]-1H-tetrazole. This has become the common motif for most of the potent antagonists reported (Li et al., 2011; Hadizad et al., 2009; Larsen et al., 1994). This discovery lead to the development of drugs such as irbesartan and losartan for the efficient treatment of hypertension. Since then these biphenyl derivatives have received enormous focus due to their inhibition of angiotensin converting enzyme (ACE) and in this regard many biphenyl derivatives have been reported (Kamble et al., 2011; Zhang et al., 2004; Chan et al., 1994).
The asymmetric unit of 4'-(morpholin-4-ylmethyl)biphenyl-2-carbonitrile is shown in Fig. 1. The the morpholine ring (O1/N2/C4–C7)adopts a chair conformation. The dihedral angle between the morpholine ring (O1/N2/C4–C7) and the benzene rings (C9–C14) and (C15–C20) are 87.87 (7)° and 44.76 (7)° respectively. No significant intermolecular interactions are observed. The crystal packing of the molecules is shown in Fig.2.