Faster, higher, stronger! The N‐heterocyclic carbene (NHC) catalyzed diastereo‐ and enantioselectivehydroacylation of cyclopropenes affords structurally valuable acylcyclopropanes. A new family of electron‐rich, 2,6‐dimethoxyphenyl‐substituted NHCs induces excellent reactivity and enantioselectivity. Preliminary kinetic studies unambiguously demonstrated the superiority of this family of catalysts
A kinetic study of additions of dialkylmagnesium compounds to a cyclopropene
作者:Herman G. Richey、Edward K. Watkins
DOI:10.1039/c39840000772
日期:——
Addition of dialkymagnesium compounds in tetrahydrofuran to spiro[2.4]hept-1-ene is kinetically first order in each component; at 35.5 °C, relative rates of addition of R2Mg where, ethyl, isopropyl, and t-butyl are 1, 10.3,32, and 8, respectively.
Comparison between ground and excited state reactivity of cyclopropenes: thermolysis and far-u.v. (185 nm) photolysis of spiro[2.4]hept-1-ene
作者:Mark G. Steinmetz、Yao-Pin Yen、Gregory K. Poch
DOI:10.1039/c39830001504
日期:——
Differences in thermal and photochemical product distributions of spiro[2.4]hept-1-ene reflect state selective reactivity of S0 and S1 vinylcarbene intermediates.