Analysis of the13C and1H spectra of mixtures of benzylidene derivatives
作者:J. C. Bradley、A. J. Williams
DOI:10.1002/mrc.1260320812
日期:1994.8
The 1H and 13C NMR spectra of methyl (E)‐2,3,‐diphenylprop‐2‐enoate and methyl (E)‐2‐(2‐phenylethenyl) benzoate resulting from the electrocyclic ring opening of benzocyclobutenone starting materials have been assigned. A combination of direct detection 2D NMR techniques, COSY, HETCOR and FLOCK, provided the assignments of the 1H and 13C resonances.
Z E photoisomerization of benzylidenebenzocyclobutenones via ketene-allene intermediates. A laser flash photolysis study
作者:R. Boch、J.C. Bradley、T. Durst、J.C. Scaiano
DOI:10.1016/0040-4039(94)88151-0
日期:1994.1
∼26 μs and can be trapped with water and methanol. Trapping by the latter occurs with a rate constant of 1.2 × 104 M−1 s−1 and leads to the expected ester. In addition to Z E isomerization, product studies reveal the formation of dimeric products in very low quantum yields.
亚苄基苯并环丁烯酮I -E和I -Z通过乙烯酮-烯丙基II的中间体进行光诱导的异构化,该酮在乙腈中的寿命约为26μs,可以被水和甲醇捕获。后者的俘获以1.2×10 4 M -1 s -1的速率常数发生,并产生期望的酯。除ZE异构化外,产物研究还表明以非常低的量子产率形成了二聚体产物。
Bradley, J. C.; Durst, T., Canadian Journal of Chemistry, 1995, vol. 73, # 10, p. 1660 - 1665