Reaction of cis-carveol with triphenylphosphine and tetrachloromethane: a note on the mechanism of the lee reaction
作者:B. Ravindranath、P. Srinivas
DOI:10.1016/s0040-4020(01)90906-8
日期:1983.1
The title reaction yielded trans-carvyl chloride 2 and pinol 3. The formation of pinol and the specific rotation of the carvyl chloride are affected by the presence of acid. The implications of these findings on the understanding of the course of the reaction are discussed. Use of an acid scavenger is recommended in application of the PPh3-CCl4 reagent for acid sensitive compounds. A bimolecular, concerted
AbstractWater loss from frans‐sobrerol upon electron impact ionization selectively involves the tertiary OH group, predominantly occurring by a stereocontrolled H‐transfer from C(5) position in a rate‐determining step process, as proved by 18O and deuterium labelling. Monomethyl ethers behave accordingly. Ionic structures of the water‐loss product or products are investigated by metastable ion and collision activation mass‐analysed ion kinetic energy spectroscopy, using model ions generated from some substrates, which are chemically related to fralts‐sobrerol in condensed phase, i.e. α‐pinane epoxide, cis‐sobrerol and pinol. A substantial conversion of cis‐sobrerol molecular ions to ionized pinol by loss of water has been demonstrated.
Schmidt, Chemische Berichte, <hi>1953</hi>, vol. 86, p. 1437,1443