The rates of mutarotation of some steroidal 5a : 6P-dibromides have beeii investigated. 501 : 6p : 225 : 23f-Tetrabromostigmastane reacts a t only 75% of the rate observed with 5c( : 6P-dibromo-cholestane and -stigmastane. The rate of rearrangement of 5a : 6P-dibromodeoxytigogenin is similar. These anomalies represent long-range effects in systems which are conformationally unambiguous.
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