Structural characterization of the reaction products of vanadium (II) and endrin as two isomers of 1,8,exo-9,10,11-pentachloro-pentacyclo[6.2.1.13,6.O2,7.O4,10] dodecan-5-one

Two dechlorinated products (B) and (D), formed in the reaction between endrin (C12H8Cl6O) and vanadium(II) for the purpose of confirmation of identity, are shown by single-crystal X-ray structure determination to be isomers of the title compound, C12H9Cl5O. Crystals of both are monoclinic, P21/c. For isomer (B), a 7·432(8), b 12·76(1), c 14·55(2) x 10-10 m, β 108·32(9)deg., Z=4; R was 0·038 for 2594 observed reflections. For isomer (D), a 9·037(4), b 12·004(4), c 14·436(6) x 10-10 m, β 124·91 (2) deg, Z=4; R was 0·041 for 1826 reflections. The geometrics of the two isomers are compared. 4 refs., 1 fig., 3 tabs