Cyclisation of phenolic oximes. Part 4. Cyclisation of 6-acetonyl-6-hydroxy-2,4-di-t-butylcyclohexa-2,4-dienone oxime with hydrogen chloride
Abstract
The title dienone with hydrogen chloride rearranges to 6-acetonyl-6-hydroxy-3,5-di-t-butylcyclohexa-2,4-dienone oxime before cyclising to 4,4a,8,8a-tetrahydro-4a-hydroxy-3-methyl-7,8a-di-t-butyl-1,2-benzoxazin-5-one.