The behavior of N,N′‐bis(pyridin‐2‐ylmethylene)benzene‐1,4‐diamine (L) towards zinc(II), cadmium(II), and mercury(II) chlorides was studied in methanol solutions. In the presence of metal ions, the organic molecule was decomposed to N‐(pyridin‐2‐ylmethylene)benzene‐1,4‐diamine (L′), and complexes of general formula M(L′)Cl2 were isolated from the mixture. The complexes were identified by elemental analysis, IR, 1H NMR, and 13C NMR spectra, and their structures were further confirmed by single‐crystal X‐ray diffraction analysis of Zn(L′)Cl2 and Hg(L′)Cl2. In the solid state of both complexes, the molecules are stabilized by N–H···Cl hydrogen bonds and aromatic π–π stacking interactions.

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A stable hemiacetal, 2,3-diphenyl-2H-1,4-benzoxazin-2-ol, was isolated as the main product from the reaction of benzil and o-aminophenol in THF. The structure of the product is confirmed by elemental analysis, common spectroscopic methods, and X-ray crystallographic analysis.

Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.003 Å; R factor = 0.030; wR factor = 0.079; data-to-parameter ratio = 19.5.In the title compound, [ZnCl 2 (C 10 H 8 N 2 )(C 2 H 6 OS)], the Zn atom is five-coordinate, forming a distorted trigonal-bipyramidal geometry involving one Cl atom, one dimethyl sulfoxide O atom and one 2,2 0 -bipyridine N atom in equatorial positions, with distances Zn-Cl = 2.2863 (7) Å , Zn-O = 2.1024 (15) Å and Zn-N = 2.1546 (16) Å . The axial positions are occupied by the other 2,2 0 -bipyridine N atom and a Cl atom, with distances N-Zn = 2.1604 (16) Å and Zn-Cl = 2.3123 (7) Å . Related literature For related literature, see: Lemoine et al. (2003); Marjani et al. (2005).Experimental Crystal data [ZnCl 2 (C 10 H 8 N 2 )(C 2 H 6 OS)] M r = 370.61 Triclinic, P1 a = 7.9553 (17) Å b = 9.5504 (19) Å c = 10.003 (2) Å = 84.042 (16) = 86.787 (17) = 83.798 (17) V = 750.7 (3) Å 3 Z = 2 Mo K radiation = 2.12 mm À1 T = 293 (2) K 0.5 Â 0.5 Â 0.45 mm Data collection Stoe IPDSII diffractometer Absorption correction: numerical (X-RED32; Stoe & Cie, 2005) T min = 0.360, T max = 0.380 7002 measured reflections 3420 independent reflections 3325 reflections with I > 2(I) R int = 0.046 Refinement R[F 2 > 2(F 2 )] = 0.030 wR(F 2 ) = 0.080 S = 1.07 3420 reflections 175 parameters H-atom parameters constrained Á max = 0.54 e Å À3 Á min = À0.48 e Å À3

New cyclopentenone derivatives were prepared via aldol condensation of substituted benzils with acetone derivatives in alkaline media. The structures of products were confirmed by elemental analysis, IR, 1 H NMR, 13 C NMR and mass spectroscopy and supported by a single crystal X-ray diffraction analysis of 3,4-bis(4-chlorophenyl)-5,5-dimethyl-4-hydroxy-2-cyclopenten-1-one. The crystal structure of title compound in the solid state is stabilised by O-H…O and C-H…O hydrogen bonds, as well as by Cl…Cl close contacts.