Ferrocene‐Based, Potentially D, C, D‐Coordinating (D = O, S), Pincer‐Type Proligands and Their Organotin Derivatives. Issue 26 (11th July 2017) - Nayyar, Bastian
Abstract : Metalation of 1, 3‐diiodoferrocene provided ferrocene‐based D, C, D‐containing (D = O, S) pincer‐type ligands [(η 5 ‐Cp)Fe(η 5 ‐C5 H3 ‐1, 3‐{P(D)R2 }2 )] (1 : D = O, R = O i Pr;2 : D = O, R = OPh;3 : D = S, R = Ph). The corresponding organotin derivatives [(η 5 ‐Cp)Fe(η 5 ‐C5 H2 ‐1‐SnPh3 ‐2, 5‐{P(O)(O i Pr)2 }2 )] (4 ), [(η 5 ‐Cp)Fe(η 5 ‐C5 H2 ‐1‐SnPh2 I‐2, 5‐{P(O)(O i Pr)2 }2 )] (5 ), and [(η 5 ‐Cp)Fe(η 5 ‐C5 H2 ‐1‐SnMe3 ‐2, 4‐{P(S)Ph2 }2 )] (6 ) are reported as well. The compounds were characterized by elemental analysis, 1 H, 13 C, 31 P, 119 Sn NMR and IR spectroscopy, ESI mass spectrometry, and single‐crystal X‐ray diffraction (3 and4 ). Abstract : Tetraorganotin compound4 containing O, C, O‐coordinating pincer‐type ligand [(η 5 ‐Cp)Fe(η 5 ‐C5 H2 ‐2, 5‐{P(O)(O i Pr)2 }2 )] – reacts with elemental iodine to give triorganotin iodide derivative5, which shows one and not two intramolecular P=O→Sn interactions and, under the experimental conditions employed, does not undergo cyclization to give a phosphastannole derivative.