Reactions of S allyl systems (allyl sulphides of R S allyl type, where R= Et, allyl, Ph, Me3C, Ph3C, as well as of allyl phenyl sulphoxide, allyl phenyl sulphone, 2, 5-dihydro-1, 1- dioxothiophene) with [RuClH (CO)(PPh3) 3] and other ruthenium compounds have been investigated. Double-bond migration was observed in the case of allyl trityl sulphide, allyl t- butyl sulphide and both sulphones, that is, where co-ordinating properties of sulphur were ...