Cyclic SN compounds and phosphorus reagents part 6. Reactions of S4N4 with ...

Abstract

Title full: Cyclic SN compounds and phosphorus reagents part 6. Reactions of S4N4 with symmetrical tertiary phosphines, R3P (R = t-C4H9, c-C6H11, C6H5CH2, p-MeOC6H4 and p-ClC6H4): Isolation and characterization of phosphinimino substituted cyclic sulphur nitrides. Unlike Ph3P, reactions of S4N4 with symmetrical tertiary phosphines, R3P (R = t-butyl, cyclohexyl, benzyl, p-methoxyphenyl and p-chlorophenyl) afford only the corresponding phosphiniminocyclotrisul-phurtrinitrides, R3PNS3N3 (I-V) in moderate to good yields. (p-ClC6H4)3P alone yields the disubstituted S4N4 derivative, 1,5-[(p-ClC6H4)3PN]2S4N4 (VI) in low yield which undergoes a ring contraction in solution. Among the red crystalline compounds I-V, those containing aliphatic substituents on phosphorus (I-III) are less stable both in solid and solution phases than those containing aromatic substituents (IV and V). Various spectroscopic data have been discussed. © 1989.