Photocyclization of a conjugated triaryl ‘Y-enyne’
作者:Bilal R Kaafarani、Douglas C Neckers
DOI:10.1016/s0040-4039(01)00721-3
日期:2001.6
electrocyclic ring closure to photoproduct 4. A mechanism involving an allene intermediate is proposed. In nonpolar solvents a [1,5] H shift affords the photoproduct, while in methanol protonation of the central allenic carbon occurs. Quantum yields of the photoreaction in the different solvents were measured.
Photocyclization of a naphthyl substituted Y-enyne
作者:Bilal R. Kaafarani、Brigitte Wex、Jeanette A. Krause Bauer、Douglas C. Neckers
DOI:10.1016/s0040-4039(02)02032-4
日期:2002.11
Y-enyne 1 undergoes electrocyclic ring closure, via a cumulene intermediate 2. to photoproduct 3 upon irradiation at 350 run in the presence/absence of air. In non-polar solvents, a [1,5] H-shift affords the photoproduct. In MeOX (X=H/D), protonation/deuteration of the central allenic carbon in 2 occurs. The X-ray Structure of 3, the photoproduct upon irradiation of 1 in benzene. is reported. (C) 2002 Elsevier Science Ltd. All rights reserved.