BROMINATION OF BINOR-S

Bromination of binor-S resulted in a mixture of products containing se veral pairs of isomers. Three major processes were found to be involve d in the reaction mechanism, i.e., bromination, hydrobromination, and dehydrobromination. The structures of nine compounds derived from dibr omide 6 were identified by spectroscopic methods. Yields between isome rs were rationalized by comparison of their relative strain energies c alculated by force field model (MM2). The crystal structures of a trib romide (9) and a pentabromide (15) were solved by X-ray diffraction an alyses. Their crystal packing patterns indicated the existence of attr active interactions among the bromine atoms.