Stereocontrolled regiospecificity of the water loss fromtrans-sobrerol radical cation upon electron ionization
作者:Antonio Selva、Francesco Ferrario、Paolo Ventura、Renato Pellegata
DOI:10.1002/oms.1210220809
日期:1987.8
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.