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Reductive cyclization of 1,3,5-triphenyl- and 3-(2-meth-oxy-phen-yl)-1,5-di-phenyl-pentane-1,5-diones by zinc in acetic acid medium leads to the formation of 1,2,4-tri-phenyl-cyclo-pentane-1,2-diol [1,2,4-Ph 3 C 5 H 5 -1,2-(OH) 2 , C 23 H 22 O 2 , ( I )] and 4-(2-meth-oxy-phen-yl)-1,2-di-phenyl-cyclo-pentane-1,2-diol [4-(2-MeOC 6 H 4 )-1,2-Ph 2 C 5 H 5 -1,2-(OH) 2 , C 24 H 24 O 3 , ( II )]. Their single crystals have been obtained by crystallization from a THF/hexane solvent mixture. Diols ( I ) and ( II ) crystallize in ortho-rhom-bic ( Pbca ) and triclinic ( P ) space groups, respectively, at 150 K. Their asymmetric units comprise one [in the case of ( I )] and three [in the case of ( II )] crystallographically independent mol-ecules of the achiral (1 R ,2 S ,4 r )-diol isomer. Each hydroxyl group is involved in one intra-molecular and one inter-molecular O-H⋯O hydrogen bond, forming one-dimensional chains. Compounds ( I ) and ( II ) have been used successfully as precatalyst activators for the ring-opening polymerization of ∊-caprolactone.

acta crystallographica. section e, crystallographic communications

(1R,2S,4r)-1,2,4-Triphenylcyclopentane-1,2-diol and (1R,2S,4r)-4-(2-methoxyphenyl)-1,2-diphenylcyclopentane-1,2-diol: application as initiators for ring-opening polymerization of ∊-caprolactone