The reaction of dithiadiphosphetane disulfides with dienes, alkenes and thioaldehydes

Ferrocenyl dithiadiphosphetane disulfide behaves as RPS2 in simple cycloadd ition reactions. Reactions with norbornadiene, norbornene and hexamethyl de war benzene ail give rise to fused 4-membered C2PS ring compounds. Reaction with 2,3-dimethylbutadiene gave a simple Diels-Alder adduct which undergoe s further reaction with BuLi and RX to yield FcP(S)(SR)(C6H9) (R = CH2Ph, o -MeC6H4CH2, 2,4-dinitrophenyl). A trithiaphosphorinane was obtained when Fc (2)P(2)S(4) was reacted with benzaldehyde or trimethylacetaldehyde. Reactio n of Fc(2)P(2)S(4) with PhCH2N = CHPh gave a dithiophospholane and a thiaza diphosphetane disulfide. The new compounds have been characterised spectros copically with illustrative examples having been studied by X-ray crystallo graphy.