Syntheses and crystal structures of tungsten complexes containing various (thiazoliumyl)diphenylphosphine ligands

Article abstract of DOI:10.1021/om970418e

Alkylation reactions at the S atom of the anionic PPh₂C(=NPh)S^- ligand coordinated to a tungsten pentacarbonyl group afford the neutral complexes W(CO)₅PPh₂C(=NPh)SR (4, R = CH₂C≡CH; 5, R = CH₂C≡N; 6, R = CH₂CONH₂; 7, R = CH₂CH=CH₂; 8, R = CH₂CO₂-Me). Protonation of 4 with HBF₄ at room temperature causes cyclization to the cationic complex W(CO)₅PPh₂[CSCH₂C(CH₂)NPh]BF ₄ (10), which contains a (thiazoliumyl)diphenylphosphine ligand. Similarly, protonation reactions of 5 and 6 with HBF4 give the cationic complex [W(CO)₅PPh₂CSCHC(NH₂)NPh]BF₄ (11) and the neutral complex W(CO)₅PPh₂CSCHC-(OBF₃)NPh (12), respectively, both of which contain (thiazoliumyl)diphenylphosphine ligands. The structures of 10 and 12 are determined by X-ray diffraction analyses.