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A new method for mild metal free hydrosilylation is described, Silylated cy
clohexadienes are used as radical transfer hydrosilylating reagents for var
ious double and triple bonds, A trialkylsilane is transferred from a cycloh
exadiene moiety to an alkene. The hydrosilylation can be combined with a C-
C bond formation as shown for the preparation of silylated cycloalkanes fro
m the corresponding dienes.