Trimethylsilyl cyanide is the chemical compound with the formula (CH3)3SiCN. This volatile colorless liquid consists of a cyanide group, that is CN, attached to a trimethylsilyl group. The molecule is used in organic synthesis as the equivalent of hydrogen cyanide. It is prepared by the reaction of lithium cyanide and trimethylsilyl chloride:LiCN + 3SiCl → 3SiCN + LiCl