Abstract
The [2,2,2-trifluoro-1-(trifluoromethyl)-1-(trimethylsiloxy)ethyl]phosphonates 2a-g and/or the 4,4,5,5-tetrakis(trifluoromethyl)-1,3,2λ5σ4-dioxaphospholanes 4a-c, e were obtained from the silylphosphites 1a-g and hexafluoroacetone depending on the reaction conditions. Intermediates were the λ5σ5-phosphoranes 3a-e formed by an 1:2 oxidative addition of hexafluoroacetone whereas in the case of the cyclic phosphites 1f and g thermally stable phosphoranes, 3f, 6 and 3g were found to undergo no substituent exchange
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