Reaction of Tin(II) Hydride with Compounds Containing Aromatic C−F Bonds

The reaction of the stable tin(II) hydride LSnH (1; L = CH{(CMe)2(2,6-iPr2C6H3N)2}) with fluorinated aromatic compounds
is described. The reaction of 1 with equivalent amounts
of pentafluorobenzophenone (PhCOC6F5) and perfluorobenzophenone
(C6F5COC6F5), respectively,
in toluene at room temperature, leads to the nucleophilic addition
products LSnOCHPh(C6F5) (3) and
LSnOCH(C6F5)2 (4) as
well as to metathesis products PhCO(4-C6F4H)
(5) and C6F5CO(4-C6F4H) (6) with the formation of LSnF (2). In contrast, the reactions of 4-fluorobenzophenone (PhCO-4-C6H4F) and pentafluorobenzaldehyde (C6F5CHO) with 1 provide the tin(II) alkoxide
products LSnOCHPh(4-C6H4F) (7)
and LSnOCH2C6F5 (8)
as a result of nucleophilic addition of hydride to the carbonyl group.
Moreover, 1 was treated with C6F6 in C6D6 at room temperature and after 24 h
the 1H, 19F, and 119Sn NMR spectra
were recorded, which indicated the appearance of LSnF (2), C6F5H (9), and LSnC6F5 (10). Formation of compound 10 was further confirmed by its synthesis from LSnCl and C6F5Li.