Synthesis and structural studies of 2-stannyl-substituted ferrocenylmethylamine and -phosphine derivatives 2-Me2RSnFcCH2Y (R = Me, Cl; Y = NMe2, PPh2, P(O)Ph2; Fc = C10H8Fe)

Article abstract of DOI:10.1016/0022-328X(95)05549-5

2-(Trimethylstannyl)ferrocenylmethyldiphenylphosphine, 2-Me3SnFcCH2PPh2 (2a), was synthesized from 2-Me3SnFcCH2NMe2 (1a) and Ph2PH.Compound 2a is oxidized with H2O2 to 2-Me3SnFcCH2P(O)Ph2 (3a).Halogenation of 1a and 2a with Me2SnCl2 and 3a with HCl-diethyl ether yields the organotin monochlorides 2-Me2(Cl)SnFcCH2Y (1b, Y = NMe2; 2b, Y = PPh2; 3b, Y = P(O)Ph2).Both crystal structure determinations and multinuclear magnetic resonance studies in solution reveal for 1b-3b molecular structures in which the tin atom approaches a trigonal bipyramidal pentacoordination as a consequence of an intramolecular Y Sn interaction.The donor strength of Y increases in the order PPh2 < NMe2 < P(O)Ph2.In solution 1b and 2b undergo ligand-exchange processes.Keywords: Organotin; Ferrocene; Pentacoordination; Crystal structure; NMR