Competitive rearrangements of alkylacetoxycarbenes
作者:Robert A Moss、Song Xue、Wei Ma、Huarong Ma
DOI:10.1016/s0040-4039(97)00936-2
日期:1997.6
Absolute rate constants are determined for (1,2) acetyl, carbon, and hydride shifts in cyclobutylacetoxycarbene and isopropylacetoxycarbene; comparative reactivities are examined.
A Nonspectroscopic Method To Determine the Photolytic Decomposition Pathways of 3-Chloro-3-alkyldiazirine: Carbene, Diazo and Rearrangement in Excited State
作者:Takatsugu Wakahara、Yasuyuki Niino、Takashi Kato、Yutaka Maeda、Takeshi Akasaka、Michael T. H. Liu、K. Kobayashi、S. Nagase
DOI:10.1021/ja0116876
日期:2002.8.1
of carbene, diazo compound, and for the rearranged product via the excitedstate in the photolysis of 3-chloro-3-isopropyldiazirine and 3-chloro-3-chloromethyldiazirine. The carbene adds to C(60) to form methanofullerene, whereas the diazo compound adds to C(60) to form fulleroid. The olefin product arises as a result of the rearrangement in the excitedstate.
Quantum Yield of Formation of Diazo Compounds from the Photolysis of Diazirines
作者:Roland Bonneau、Michael T. H. Liu
DOI:10.1021/ja9613217
日期:1996.1.1
Laser Flash Photolysis Study of Alkylhalocarbenes Generated from Non-Nitrogenous Precursors
作者:Marc Robert、Igor Likhotvorik、Matthew S. Platz、Sarah C. Abbot、Mary M. Kirchhoff, and、Richard Johnson
DOI:10.1021/jp972464y
日期:1998.2.1
Previously we have studied the photochemistry of alkylchlorodiazirines using laser flash photolysis methods and the pyridine ylide technique (White et al. J. Org. Chem. 1992, 17, 2841). The yield of trappable carbene was found to be a sensitive function of the alkylcarbene structure. This was attributed to ring opening of the diazirine to form a biradical which could suffer rearrangement, in addition to fragmentation to a carbene. It was also possible to explain the data in terms of a carbene-pyridine complex which can either rearrange or collapse to an ylide. In this work, alkylchlorocarbenes are generated from phenanthridenes. The results do not rule out the intermediacy of a carbene-pyridine complex; however, if this species is formed, it does not rearrange to chloroalkene in competition with collapse to form an ylide. This study reduces the urgency with which to postulate carbene-olefin complexes (Tomioka et al. J. Am. Chem. Soc. 1984, 106, 454).
Mechanism of Graham's reaction
作者:Robert A. Moss、Joanna Wlostowska、Wenjeng Guo、Michal Fedorynski、James P. Springer、Jordan M. Hirshfield