Reaction with alcohols of 1-bromo(chloro)-1,2-epoxyheptafluorobutanes and 1,2-epoxyperfluorobutane. Preparation of α-bromo-, α-chloro-, and α-alkoxyhexafluorobutyric acids esters
摘要:
1-Bromo(chloro)-1,2-epoxyheptafluorobutanes reacted with primary and secondary alcohols by two concurrent routes giving a mixture of esters of alpha-alkoxy- and alpha-bromo(chloro)-hexafluorobutyric acids with growing content of the latter on increasing the bulk of the nucleophilic agent. 1,2-Epoxyperfluorobutane under the same conditions was converted into alpha-alkoxyhexafluorobutyric acid esters. Reaction of 1-bromo- 1,2-epoxyheptafluorobutane and 1,2-epoxyperfluorobutane with potassium tert-butylate in tert-butanol resulted in tert-butyl alpha-bromohexafluorobutyrate and heptafluorobutyrate respectively due to the forced attack of the bulky nucleophile on the terminal carbon atom of the epoxy ring.
analyses of the thermal decomposition of t-butyl heptafluoroperoxybutyrate (TBH) in benzene, octane, nitrobenzene, pyridine, and methoxybenzene have been carried out. In benzene and octane, the decomposition appears to be entirely a radical process. In nitrobenzene and pyridine, the reactions are found to give ionicdecomposition products exclusively. On the other hand, the decomposition of TBH in methoxybenzene
The decomposition of t-butyl heptafluoroperoxybutyrate (TBH) was studied in both toluene and methanol. Kinetic and product studies from the thermolysis showed that this peroxy ester decomposes heterolytically in nonpolarsolvents like toluene with homolysis, whereas in methanol this peroxy ester undergoes principally transesterification.
Polyfluoroalkylisoxazolylamines, their preparation and use
申请人:SHIONOGI & CO., LTD.
公开号:EP0220947A2
公开(公告)日:1987-05-06
Novel compounds useful as intermediates for synthesizing, inter alia, pesticides and medicines, have the formula:
in which:
R is an alkyl group having a plurality of fluorines; R1 is hydrogen, alkyl, halogen or optionally substituted phenyl; and R2 is hydrogen or alkyl; and the invention includes salts thereof.
可用作合成农药和药物等的中间体的新型化合物具有以下式子:
其中
R 是具有多个氟的烷基;R1 是氢、烷基、卤素或任选取代的苯基;R2 是氢或烷基;本发明包括其盐类。
Relative reactivity of bridgehead adamantyl and homoadamantyl substrates from solvolyses with heptafluorobutyrate as a highly reactive carboxylate leaving group. Absence of SN2 character of solvolysis of tert-butyl derivatives