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As is well known, the sterols are monohydric polycyclic secondary alcohols, many of which are unsaturated at the 5,6 position. The various sterols differ in the number of double bonds and in the structure of the side chain. (0 One of the more important reactions in sterol chemistry is the temporary inactivation of the double bond in the 5,6 position. Permanent inactivation is generally brought about by hydrogenation (1). Temporary inactivation has been effected by the addition of bromine (2) orpmid:21018775 fatcat:pdc3p5fwkrefdbty7zctwsl6tq