Discussion When chlorine was added to trimethylene sulfide in a chloroform solution in a ratio of one mole of chlorine to two moles of the sulfide, bis-(3-chloropropyl) disulfide (I) was formed as the principal product. Reaction of this compound with excess piperidine gave bis- (3-piperidinopropyl) disulfide (11) isolated as the dihydrochloride salt. Similarly, addition of bromine to a chloroform solution of trimethylene sulfide resulted in the formation of an ...