From the aqueous filtrate they could isolate the major part of I11 unchanged, but, after vacuum distillation, the recovered 111 again reacted to the same extent with water. They explained this peculiar behavior by assuming that 111 consisted of an inseparable mixture of the two possible stereoisomers (syn and anti) of which only one component reacted with water and that subsequent distillation of the remainder restored the original equilibrium ...
