Phenanthrene Synthesis by Eosin Y-Catalyzed, Visible Light- Induced [4+2] Benzannulation of Biaryldiazonium Salts with Alkynes
作者:Tiebo Xiao、Xichang Dong、Yanchi Tang、Lei Zhou
DOI:10.1002/adsc.201200569
日期:2012.11.26
A metal-free, visible light-induced [4+2] benzannulation of biaryldiazonium salts with alkynes was developed. With eosin Y as photoredox catalyst, a variety of 9-substituted or 9,10-disubstitutedphenanthrenes were obtained via a cascade radical addition and cyclization sequence.
α-Carbonyl Cations in Sulfoxide-Driven Oxidative Cyclizations
作者:Tobias Stopka、Meike Niggemann、Nuno Maulide
DOI:10.1002/anie.201705964
日期:2017.10.16
The selective, metal‐free generation of α‐carbonyl cations from simple internal alkynes was accomplished by the addition of a sulfoxide to a densely substituted vinyl cation. The high reactivity of the α‐carbonyl cations was found to efficiently induce hydrogen and even carbon shift reactions with unusual selecivities. Complex compounds with highly congested tertiary and all‐carbon‐substituted quartenary
Sequential multiple-photon photochemistry of sterically congested enones
作者:Karlyn A. Schnapp、Philip L. Motz、Sharon M. Stoeckel、R.Marshall Wilson、Jeanette A. Krause Bauer、Cornelia Bohne
DOI:10.1016/0040-4039(96)00284-5
日期:1996.4
The photochemistry of sterically hindered enones 1 and 2 is described. A novel photorearrangement occurs in both systems which involves carbonyl attack on the adjacent phenyl ring, expansion of that ring to a cycloheptatriene and subsequent photochemically induced 1,7-phenyl migration.