text: PhSnH, as it is more commonly  abbreviated, is prepared by treatment of  triphenyltin chloride with lithium aluminium hydride.  Although PhSnH is treated as a source of "H·", in fact it does not release free hydrogen atoms, which are extremely reactive species.  Instead, PhSnH transfers H to substrates usually via a radical chain mechanism.  This reactivity exploits the relatively good stability of "PhSn·"