Cyclopropane chemistry. Part I. Thermal isomerisation of gem-dichlorocyclopropanes to olefins
作者:R. Fields、R. N. Haszeldine、D. Peter
DOI:10.1039/j39690000165
日期:——
prepared and the compounds have been pyrolysed in a flow system at 500–670°. This pyrolysis is a useful route to olefins. 1,1-Dichlorocyclopropane gives 2,3-dichloropropene in high yield. Cyclopropanes containing more chlorine substituents also give, in each case, a high yield of a single olefin isomeric with the cyclopropane; for instance 1,1,2-trichlorocyclopropane gives 1,1,3-trichloropropene, the 1
have been fluorinated with elementalfluorine to give good yields of hydrohalofluoroalkanes. The best operational conditions for F2 addition to the double bond rather than hydrogen and/or chlorine atom substitution, dimerization and oligomerization of radical intermediates have been studied. Preliminary studies on the reaction of Freon 12 and Freon 22 towards elementalfluorine have also been carried out