Reactive intermediates in the photolysis and thermolysis of 3-chloro-3-benzyldiazirine
作者:Michael T.H. Liu、Najmul H. Chishiti、Michal Tencer、Hideo Tomioka、Yasuji Izawa
DOI:10.1016/s0040-4020(01)91478-4
日期:1984.1
The photochemical and thermal decomposition of 3-chloro-3-benzyldiazirine have been studied in different reaction conditions. The decomposition gives rise to benzylchlorocarbene which can rearrange to E and Z chlorostyrene and/or react with the environment. In the presence of acetic acid the main product is 1-chloro-2-phenylethyl acetate. Experiments with acetic acid-d4 showed that some of the chlorostyrene
作者:Michael T. H. Liu、Raghava V. Suresh、N. Soundararajan、Edward G. Vessey
DOI:10.1039/c39890000012
日期:——
Relative reactivities of benzylchlorocarbene towards electron-poor and electron-rich alkenes indicate the carbene to be ambiphilic.
苄基氯卡宾对贫电子和富电子的烯烃的相对反应性表明,该卡宾具有两亲性。
Energy barrier for 1,2-hydrogen migration in benzylchlorocarbene
作者:Michael T. H. Liu
DOI:10.1039/c39850000982
日期:——
r rate constants derived from the thermolysis and photolysis of 3-chloro-3-benzyldiazirine in tetramethylethylene gave an excellent Arrhenius plot; an activation energy of 6.4 kcal mol–1(26.8 kJ mol–1) was obtained for the 1,2-H migration in benzylchlorocarbene.
Rearrangement of Alkylchlorocarbenes: 1,2-H Shift in Free Carbene, Carbene−Olefin Complex, and Excited States of Carbene Precursors
作者:Roland Bonneau、Michael T. H. Liu、Kyu Chul Kim、Joshua L. Goodman
DOI:10.1021/ja952700n
日期:1996.4.24
in the presence of olefins gives a cyclopropane (3) by addition of the generated carbene to the olefin and a vinyl chloride derivative (2) resulting from a 1,2-Hshift rearrangement. This rearrangement may occur either in the carbene or in some excited state, precursor of the carbene (RIES mechanism), or in a “carbene + olefin complex” on the way to the formation of 3 (COC mechanism). Results obtained
Generation and Study of Benzylchlorocarbene from a Phenanthrene Precursor
作者:Manisha Nigam、Matthew S. Platz、Brett M. Showalter、John P. Toscano、Richard Johnson、Sarah C. Abbot、Mary M. Kirchhoff
DOI:10.1021/ja980251w
日期:1998.8.1
photoisomerize to diazo compound 7, but this process is inefficient (φ = 0.075) and is not likely to be responsible for the curvature in plots of adduct/styrene versus [TME] observed with the diazirine precursor. Thus, the second, noncarbene, pathway to β-chlorostyrene is neither a carbene−olefin complex nor a diazo intermediate. It is proposed that the second pathway involves a rearrangement in the excited