Abstract

A series of organotrisiloxanes [(Me₃SiO)₂MeSi(CH₂)_nO(CH₂)_mR_f], (n = 3, m = 1, R_f = CF₃; n = 3, m = 2, R_f = C₄F₉, C₆F₁₃, C₈F₁₇, C₁₀F₂₁, C₇F₁₅; n = 5, m = 1, R_f = CF₃; n = 10, m = 0, R_f = C₃HF₆; n = 10, m = 1, R_f = CF₃) have been prepared by the [Pt(cyclooctadiene)Cl₂] catalysed hydrosilylation reaction between heptamethyltrisiloxane and CH₂CH(CH₂)_n−2O(CH₂)_mR_f. Yields are dependent upon the alkene chain length and degree of branching of the R_f group. Isomeric products [(Me₃SiO)₂MeSi(CH₂)₃OCH₂CF₃] and [(Me₃SiO)₂MeSiCH(Me)CH₂OCH₂CF₃] were detected in reactions involving CH₂CHCH₂OCH₂CF₃ only.