Preparation of sterically crowded t-butylfurans by direct t-butylation and cyclisation of t-butyl substituted 1,4-diketones. Selective dehydrodimerisation of neopentyl ketones by lead dioxide
作者:Hans Wynberg、Ulfert E. Wiersum
DOI:10.1039/c39900000460
日期:——
o-Di-t-butylfurans can be obtained in high yields via Friedel–Crafts alkylation and via cyclisation of 1,4-diketones, but minor differences in the substitution pattern of the starting materials prevent o-di-t-butylation, or govern escape reactions to relieve the steric strain.
ø -二-叔- butylfurans可以以高产率来获得通过弗里德尔-克拉夫茨烷基化和经由的1,4-二酮类的环化,但在原料的取代模式的微小差别防止ø -二-叔丁基化,或治逃避反应以减轻空间应变。