Abstract In contrast to the already-known routes which require very low temperature conditions (in the region of− 100), the direct partial silylation of gem-polychlorinated compounds occurs at 30–60 with the organochlorosilane/Mg/HMPT system. This type of reaction permits an easy synthesis of α-chlorinated silylated derivatives which lead to the corresponding α-functional silylated compounds: thus, Ph CO SiMe 3 can be easily ...