Selected Substituent Effects on the Rate and Efficiency of Formation of an Eight-Membered Ring by RCM
作者:Lisa Mitchell、John A. Parkinson、Jonathan M. Percy、Kuldip Singh
DOI:10.1021/jo702726b
日期:2008.3.1
highlight a discrepancy between cyclization rate and cyclization efficiency. Cyclization rates change modestly as the oxygen function at the allylic position is varied, and increase upon gem-dimethylation. Cyclization efficiency has also been quantified for four substrates, revealing a range of effective molarities (EMs) of 2 orders of magnitude that are substituent dependent. The most efficient cyclization