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Key indicators: single-crystal X-ray study; T = 193 K; mean (C-C) = 0.004 Å; R factor = 0.030; wR factor = 0.075; data-to-parameter ratio = 16.7.The title compound, [CuCl 2 (C 11 H 16 N 4 )], is isostructural with the previously characterized Zn II analogous complex. The Cu II ion is four-coordinate in a CuCl 2 N 2 distorted tetrahedral geometry. In the crystal structure, weak C-HÁ Á ÁCl interactions are observed. metal-organic compounds m2782 # 2007 International Union of Crystallography

structure structure (organic substances) K 9000 -0232H-1-Benzopyrans.Part 3. 4-Hydroxy-3-methoxycarbonyl-2dimethoxyphosphoryl-2H-1-benzopyran.-The X-ray structure of title compound (I) (triclinic, P1, Z=2) is determined with a view to the spasmolytic activities of 2H-1-benzopyrans. -(OLSZAK, T. A.; GRABOWSKI, M. J.; MODRANKA, R.; KOSTKA, K.; OLSZAK, A.; Acta Crystallogr., Sect. C: Cryst.

4,4-Dichloro-4H-l-benzopyran-2-carbonyl chloride in the reaction with tertiary phosphites forms two stereoisomeric products (E) and (Z). The mechanism of their formation and the structure has been suggested.