Isomerisation reaction of a gem-bis-trifluoromethyl olefin in a basic medium: a kinetic study
摘要:
The rearrangement of 5-phenyl-1,1,1-trifluoro-2-(trifluoromethyl)pent-2-ene to 5-phenyl-1,1,1-trifluoro-2-(trifluoromethyl)pent-3-ene has been studied by F-19 NMR in dimethylsulphoxide (DMSO). This isomerisation is catalysed by a base such as triethylamine. It is apparent that the olefin is more stable when the two trifluoromethyl groups are placed on a saturated carbon rather than on a vinylic carbon. In the isomerisation process, the part of triethylamine is to assist the intramolecular hydrogen transfer to give the more stable isomer. (C) 2001 Elsevier Science B.V. All rights reserved.
Isomerisation reaction of a gem-bis-trifluoromethyl olefin in a basic medium: a kinetic study
摘要:
The rearrangement of 5-phenyl-1,1,1-trifluoro-2-(trifluoromethyl)pent-2-ene to 5-phenyl-1,1,1-trifluoro-2-(trifluoromethyl)pent-3-ene has been studied by F-19 NMR in dimethylsulphoxide (DMSO). This isomerisation is catalysed by a base such as triethylamine. It is apparent that the olefin is more stable when the two trifluoromethyl groups are placed on a saturated carbon rather than on a vinylic carbon. In the isomerisation process, the part of triethylamine is to assist the intramolecular hydrogen transfer to give the more stable isomer. (C) 2001 Elsevier Science B.V. All rights reserved.