Reaction of dimethylethylidenecarbene with olefins
作者:Melvin S. Newman、Timothy B. Patrick
DOI:10.1021/ja01051a048
日期:1969.11
Alkylidenecarbenes from 1-diazo-1-alkenes: their electrophilicity and stereochemistry of [2 + 2]-cycloaddition
作者:John C. Gilbert、David H. Giamalva
DOI:10.1021/jo00041a024
日期:1992.7
Determination of the rho-value for the [2 + 2]-cycloaddition of the alkylidenecarbene derived from 1-diazo-2-methyl-1-propene shows that the carbene has an electrophilicity comparable to that of the species derived from alpha-elimination of the corresponding vinyl triflate. Measurements of rho as a function of solvent indicate that the carbene is free of encumbrance with solvent molecules, at least in the sense that the latter are functioning as Lewis bases. The observed stereochemistry of the [2 + 2]-cycloaddition is consistent with the alkylidenecarbene being produced in a singlet electronic state.
Nature of Alkylidenecarbenes Generated from Alkenylphenyliodonium Tetrafluoroborates via Base-Induced .alpha.-Elimination