Conversion of Alkyltantalum Chlorides to Fluorides Using Trimethyltin Fluoride as a Fluorinating Agent. Crystal Structures of (<i>p</i>-MeC₆H₄CH₂)₃TaF₂, (Me₃SnCl·Me₃SnF·TaF₅)<i>_n</i>, (Me₃Si)₂CHTaCl₄, {(Me₃Si)₂CHTaCl₄·[(Me₃Si)₂CH]₂Ta₂Cl₆(μ₂-O)}, and (Me₃Si)₂CHTaF₄

Abstract

The reactions of alkyltantalum chlorides with trimethyltin fluoride were found to be highly dependent on the number of organic ligands on tantalum as well as on the electronic and the steric nature of the substituents. The synthesis of trialkyltantalum difluorides of general formula (RCH 2 ) 3 TaF 2 (R = Ph, 1; R = p -Tol, 2; R = Me 3 Si, 3 ) and the first example of the alkyltantalum tetrafluoride (Me 3 Si) 2 CHTaF 4 ( 8 ) are reported. The compounds ( p -MeC 6 H 4 CH 2 ) 3 TaF 2, (Me 3 SnCl·Me 3 SnF·TaF 5 ) n, (Me 3 Si) 2 CHTaCl 4, {(Me 3 Si) 2 CHTaCl 4 ·[(Me 3 Si) 2 CH] 2 Ta 2 Cl 6 (μ 2 -O)}, and (Me 3 Si) 2 CHTaF 4 respectively have been characterized by single-crystal X-ray structural analysis.