Oxa -di-jr-methane rearrangement

The five membered ring analog 86 c with the double bond frozen in the p.y position underwent an efficient oxa-di-jr-methane rearrangement. Down to the six membered ring compound, the non reactiv-... 

Divinyl type di-jr-methane rearrangement. Oxa-di-jr-methane rearrangement. 

Perhaps one of the most ubiquitous photochemical reactions undergone by non-conjugated dienes is that encountered in the 1,4-diene system. This is referred to as the all-carbon di-jr-methane reaction. This system is one in which a central tetrahedral carbon atom is flanked by two vinyl groups. The fundamental reaction was discovered and reported in 1967 by Zimmerman and his coworkers ". A detailed account of this reaction and the closely related oxa-di-rr- and the aza-di-jr-methane rearrangements has been published recently ". This review gives the history of how and when the reaction was discovered and its developments in all its guises up to the present time. Others have reviewed other aspects of the reaction This section of this review will be devoted to the last decade of results. 

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