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 (CH)COH  +  SiS    →    [(CH)CO]SiSH  +  HS
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.