Cyclic sulphur-nitrogen compounds and phosphorus reagents: Part IV1-Reactions of phosphiniminocyclotrisulphurtrinitride, (R) Ph2PN-S3N3 (R = Phenyl- and morpholino-) with Ph3P and (OC4H8N) Ph2P: six-membered to eight-membered ring (6→8) conversions

Abstract

450-453Triphenylphosphine (A) reacts slowly with Ph3PN-S3N3(I) both in CH3CN and C6H6 to produce the known disubstituted eight-membered heterocycle, 1,5-(Ph3PN)2S4N4(III). The recently reported 1,5-[(OC4H8N)Ph2PN]2S4N4 (IV) is obtained in better yield (ca. 70%) from the reaction between (OC4H8N)Ph2PN-S3N3(II) and (OC4H8N)Ph2P(B) in acetonitrile. However, reactions in benzene of (I) with (OC4H8N)Ph2P and of (II) with Ph3P afford an inseparable mixture of (III) and (IV). Reaction temperature appears to be critical in the e ring transformation reactions