The reactions of diphenyltin with the following reagents have been examined: hydrogen peroxide, chlorine, bromine, iodine, sulfur, benzoquinone, benzoyl peroxide, dibenzyl disulfide, stannic chloride, mercuric chloride, diphenyltin dichloride. Diphenyltin forms a complex with boron trifluoride which disproportionates in boiling benzene to tetraphenyltin and metallic tin. Nitrobenzene and benzil catalyze the polymerization of diphenyltin.