Vinyl radical 5 undergoes 5-exo cyclization onto the CC double bond in competition with the 5-exo cyclization onto the aryl ring. In addition, radical 5 exhibits an unusual 1,4-radical translocation/beta-fragmentation process. In contrast, radical 4 exclusively undergoes 5-exo cyclization onto the benzene ring. This latter reaction leads to spiro radical intermediates which can either give the 1,4-aryl migration products or can be trapped by 2-cyano-iso-propyl radicals.
Rearrangements and cyclizations in vinyl radicals. Unusual example of 1,4-radical translocation.
Navacchia ML
1996
Abstract
Vinyl radical 5 undergoes 5-exo cyclization onto the CC double bond in competition with the 5-exo cyclization onto the aryl ring. In addition, radical 5 exhibits an unusual 1,4-radical translocation/beta-fragmentation process. In contrast, radical 4 exclusively undergoes 5-exo cyclization onto the benzene ring. This latter reaction leads to spiro radical intermediates which can either give the 1,4-aryl migration products or can be trapped by 2-cyano-iso-propyl radicals.File in questo prodotto:
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