Tris(tert-butoxy)silanethiol is a silicon compound containing three tert-butoxy groups and a rare Si–S–H functional group. This colourless compound serves as an hydrogen donor in radical chain reactions. It was first prepared by alcoholysis of silicon disulfide and purified by distillation: 3 (CH3)3COH + SiS2 → [(CH3)3CO]3SiSH + H2S Since 1962 it was thoroughly studied including its acid-base properties and coordination chemistry with metal ions. It coordinates to metal ions via the sulfur and oxygen donor atoms. References Hydrogen compounds Silicon compounds Tert-butyl compounds Reagents for organic chemistry