Acid-catalysed aromatisation of benzene cis-1,2-dihydrodiols: a carbocation transition state poorly stablised by resonance
作者:Derek R. Boyd、John Blacker、Briege Byrne、Howard Dalton、Mark V. Hand、Sandra C. Kelly、Rory A. More O'ferrall、S. Nagaraja Rao、Narain D. Sharma、G. N. Sheldrake
DOI:10.1039/c39940000313
日期:——
Acid-catalysed dehydration of 3-substituted benzene cis-1,2-dihydrodiols exhibits a Hammett plot with ρ=–8.2, consistent with reaction via a benzenonium ion-like intermediate; however, correlation of +M resonance substituents such as Me and MeO by σp rather than σ+ constants indicates a marked imbalance between resonance and inductive stabilisation of the transition state.
New organofluorine compounds and a biochemical process for their preparation
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0252568A2
公开(公告)日:1988-01-13
Novel compound cis-1,2-dihydroxy-3-trifluoromethylcyclohexa-3,5-diene (and certain fluoro-substituted analogues) can be produced biochemically by culturing a wild type or mutant strain of P.putida with benzotrifluoride or certain fluoro-substituted analogues as substrate.
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0252567A2
公开(公告)日:1988-01-13
A process for the preparation of a catechol and/or a compound comprising a 1,2-dihydroxycyclohexa-3,5-diene ring, which comprises growing a microorganism in the presence of a carbon source, the microorganism being capable of converting the corresponding aromatic compound into the catechol and/or the compound comprising a 1,2-dihydroxycyclohexa-3,5-diene ring; and supplying the corresponding aromatic compound to the microorganism; characterized in that the carbon source is molasses.
Separation of 1,2-dihydroxycyclohexa-3,5-diene compounds
申请人:ZENECA LIMITED
公开号:EP0379300A2
公开(公告)日:1990-07-25
A process for the separation of a compound comprising a 1,2-dihydroxycyclohexa-3,5-diene ring from a medium containing it in which the compound reacts with a phenylboronate ion to form a phenylboronate ester which is insoluble in the medium. Novel phenylboronate esters formed during the separation process are also claimed.