Stein, Allan R.; Dawe, Robert D.; Sweet, James R., Canadian Journal of Chemistry, 1985, vol. 63, p. 3442 - 3448
作者:Stein, Allan R.、Dawe, Robert D.、Sweet, James R.
DOI:——
日期:——
The use of chemical probes to differentiate between polar and SET-hydrogen atom abstraction pathways involved in the reduction reaction promoted by an 8-Al-4 anion
作者:Dennis D. Tanner、C. M. Yang
DOI:10.1021/jo00074a014
日期:1993.10
The mechanism for the reduction of aromatic ketones and alkyl halides with lithium tetrakis(N-dihydropyridyl)aluminate was found to proceed competitively by hydride reduction and by single electron transfer (SET)-hydrogen atom abstraction processes. A series of ketyl fragmentation probes were used to differentiate the two pathways. A SET process is the dominant pathway when the ketones involved are sterically hindered or when strong electron acceptors are used as the substrates. The observation that EPR-active intermediates can be detected, or that small amounts of radical derived products are formed, demonstrates only that a SET pathway is available but cannot be used to establish the mechanism of the major product-forming reactions.