The Barton–McCombie deoxygenation is one of the most important transformations in the toolbox of organic chemists which has been the subject of a number of methodological developments. In this study, we report a photocatalyzed redox deoxygenation of secondary and tertiary alcohols from thiocarbamate precursors under visible light activation. The iridium complex Ir(ppy)3 proved to be the most efficient
A Non-Cope among the Cope Rearrangements of 1,3,4,6-Tetraphenylhexa-1,5-dienes
作者:W. von E. Doering、Ludmila Birladeanu、Keshab Sarma、G. Blaschke、Ursula Scheidemantel、R. Boese、Jordi Benet-Bucholz、F.-G. Klärner、Jan-Stephan Gehrke、Bernd Ulrich Zimny、R. Sustmann、Hans-Gert Korth
DOI:10.1021/ja993417h
日期:2000.1.1
represents a perturbation of Cope'srearrangement by four radical-stabilizing phenyl groups all positioned to drive the transition region toward the homolytic−colligative end of the mechanistic spectrum. The appearance of (Z)-isomers being suppressed thermodynamically by a steric interaction of +2.6 kcal mol-1 per cis double bond, an equilibration that is stereochemically not of any Cope type, emerges as the