Some representative monoterpenes have been isomerised under the influence of Schlosser's lithium–potassium mixed superbases, promoting β-elimination reactions. The results are compared with those obtained with butyllithium and LDA. Different selectivities and different reaction yields are achieved as a function of the base employed. These results confirm the particular reactivity of bimetallic reagents
Photoinduced vinylcyclopropane-cyclopentene rearrangement: A methodology for chiral bicyclo[3.2.0]heptenes. Formai syntheses of (±)-grandisol and naturally occurring ()-Δ9(12)-Capnellene and its antipode
作者:Harikisan R. Sonawane、Vishwaniyant G. Naik、Nanjundiah S. Bellur、Virendra G. Shah、Pramod.C. Purohit、M.Uday Kumar、Dilip G. Kulltarni、Jaimala R. Ahuja
DOI:10.1016/s0040-4020(01)91019-1
日期:1991.9
The problem of achieving reaction selectivity in -alkyl vinylcyclopropanes in favour of their rearrangement to cyclopentenes, obviating the competing low energy process of the [1,5] (homo) sigmatropic hydrogen shift, is addressed. It has been demonstrated that the readily available bicyclo[4.1.0]heptenes derived from (+)-Δ3-carene. (1), upon photosensitized irradiation, are conveniently transformed
作者:Deepa Bakshi、Verinder K. Mahindroo、R. Soman、Sukh Dev
DOI:10.1016/0040-4020(89)80108-5
日期:1989.1
(+)-Car-3-ene has been converted by a simple route into (-)--caronaldehydic acid hemiacetal, an important intermediate in the commercial production of certain synthetic pyrethroids.
Die Einwirkung von N-Lithiumäthylendiamin auf (+)-Δ3-Caren (1) führt zu einem Gleichgewicht mit dem doppelbindungsisomeren (+)-Δ4-Caren (2) im Verhältnis 1:2 = 60:40.