The regioselectivity and stereoselectivity of palladium π-allyl chloride complex formation from steroidal olefins was apparently controlled by steric effects, and both cholest-4-ene and cholest-5-ene gave diastereoisomeric complexes; two of the complexes were reduced to olefins by lithium aluminium hydride stereo-specifically with retention of configuration.
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Jones et al. (1975) studied this question.