The title compound, C(24)H(30)O(8), was obtained by reaction of ethyl 4-hy-droxy-benzoate with 1,2-dichloro-ethane. The mol-ecule occupies a crystallographic inversion center, with its central ethyl-ene bridge in an anti conformation. The other ethyl-ene bridge has a gauche conformation, with the corresponding O-C-C-O torsion angle being 74.2 (1)°. The benzene rings are almost coplanar with the...

The title compound, C(28)H(26)O, was synthesized by condensation of diphenyl-methyl-lithium and ethyl acetate. In one diphenyl-methyl group, the two benzene rings are rotated by 65.0 (3)° with respect to each other, while in the other diphenyl-methyl group, the dihedral angle between the two benzene rings is 84.1 (3)°.

In the title compound, C(15)H(14)O(3)S, the dihedral angle between the two benzene rings is 59.3 (8)°. The crystal structure is stabilized by weak inter-molecular C-H⋯π inter-actions between the benzene rings and the central ethyl-ene bridge, and a weak non-classical C-H⋯O hydrogen bond occurs in the structure.

In the title mol-ecule, C(17)H(12)N(2)O, the dihedral angle between the two benzene rings is 84.98 (10)°. The dicyano-ethyl-ene group is coplanar with the benzene ring to which it is bonded. No classic hydrogen bonds were found in the crystal.

The title compound, C(22)H(24)O(5), consists of two substituted benzene rings linked by an ethyl acrylate group. The dihedral angle between the two benzene rings is 58.39 (7)°. The crystal packing is governed by two C-H⋯O inter-actions, one of which forms centrosymmetric dimers with a graph-set descriptor of R(2) (2)(18).

In the title compound, C(20)H(21)ClN(2)O(2), the ethyl 1H-benzimidazole-5-carboxyl-ate ring system, excluding the methyl-ene and methyl H atoms, is almost planar, with a maximum deviation of 0.055 (1) Å, and makes a dihedral angle of 40.63 (4)° with the benzene ring. The sec-butyl group is disordered over two positions, with refined site occupancies of 0.855 (4) and 0.145 (4). In the crystal, m...

In the title compound, C(9)H(10)O(4), the dihedral angle between the benzene ring and the -CO(2) unit is 11.93 (8)° and the conformation of the 2-hy-droxy-ethyl side chain is gauche [O-C-C-O = -71.91 (17)°]. In the crystal, mol-ecules are linked by O-H⋯O and C-H⋯O hydrogen bonds.

Enantiomerically pure (1R,1′R)-1,3-bis[1-(diphenylphosphino)ethyl]benzene (4) has been obtained for the first time. The key step involves in situ tosylation of chiral (1S,1′S)-dimethyl1,3-benzenedimethanol (6) followed by nucleophilic attack with LiPPh2(BH3) to give [(1R,1′R)1,3-bis[1-(diphenylphosphino)ethyl]benzene]-bisborane (7). The bisborane-protected phosphine can be easily handled and pu...