A new route to 1,1-difluoro-5-methylquasisilatrane (N -> Si) F2Si(OCH2CH2)(2)NMe is elaborated: the reaction of chlorinated methyltrifluorosilanes F3SiCH3-n Cln (n = 1-3) as well as trifluoro(3-chloropropyl) silane and trifluoro(propenyl)silane with N-methyl-bis(2-hydroxyethyl)amine. The reactivity of the silanes F3SiCH3-n Cl (n) increases with the number of chlorine atoms, that is, with the electronegativity of the CH3-n Cl (n) group.
A new route to 1,1-difluoro-5-methylquasisilatrane (N -> Si) F2Si(OCH2CH2)(2)NMe is elaborated: the reaction of chlorinated methyltrifluorosilanes F3SiCH3-n Cln (n = 1-3) as well as trifluoro(3-chloropropyl) silane and trifluoro(propenyl)silane with N-methyl-bis(2-hydroxyethyl)amine. The reactivity of the silanes F3SiCH3-n Cl (n) increases with the number of chlorine atoms, that is, with the electronegativity of the CH3-n Cl (n) group.
Cyclopropene chemistry. Part 1. Preparation and some reactions of 3,3-dichloro-1,2-bistrifluoromethyl- and 1,3-dichloro-2,3-bistrifluoromethyl-cyclopropene
作者:J. Michael Birchall、Klaus Burger、Robert N. Haszeldine、Shmaiel N. Nona
DOI:10.1039/p19810002080
日期:——
reaction of dichlorocarbene [generated by thermaldecomposition of trifluoro(trichloromethyl)silane] with hexafluorobut-2-yne; the 3,3-dichloro-compound is isomerised to the 1,3-dichloro-isomer by heat, light, or chemical catalysis, but conditions are described for the preparation of either pure cyclopropene. Treatment of either isomer with antimony pentafluoride gives solutions containing the chlorob
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
3-dichlorobistrifluoromethyl- (I) and 1,3-dichlorobistrifluoromethyl-cyclopropene (II). The 3,3-dichloro-compound (I) is isomerised to (II) by heat, light, or chemical catalysis, but high yields of either pure cyclopropene may be obtained by modification of the reaction conditions. The cyclopropenium ion (III) is formed when either (I) or (II) is treated with antimonypentafluoride.
Cyclopropane chemistry. Part 5 [1,2]. Hexafluorocyclopropane as a source of difluorocarbene
作者:J.Michael Birchall、Roy Fields、Robert N. Haszeldine、Reginald J. McLean
DOI:10.1016/s0022-1139(00)85225-2
日期:1980.6
yields of the corresponding 1,1-difluorocyclopropanes, formed by addition of difluorocarbene to the olefin. The tetrafluoroethylene formed dimerises to octafluorocyclobutane, co-dimerises with the olefin, or survives, depending on the reaction conditions. With allene, hexafluorocyclopropane gives 1-(difluoromethylene)cyclopropane, 2,2,3,3-tetrafluorospiropentane, and products derived from tetrafluoroethylene
Carbene chemistry. Part 13 [1]. Preparation of sole fluoroallenes by a carbene route, and the reaction of allenes with halogenocarbenes
作者:Michael J. Bunegar、Roy Fields、Robert N. Haszeldine
DOI:10.1016/s0022-1139(00)85226-4
日期:1980.6
Fluoroallene and 1, 3-difluoroallene are prepared in good overall yield by the addition of dichlorocarbene to vinyl fluoride and 1, 2-difluoroethylene respectively, followed by pyrolysis of the dichlorocyclopropanes and treatment of the resulting dichloropropenes with zinc. Pyrolysis of 1, 1-dichloro-2-fluorocyclopropane over zinc gives fluoroallene directly.