Facile Access of Stable Divalent Tin Compounds with Terminal Methyl, Amide, Fluoride, and Iodide Substituents

摘要

The stable beta-diketiminate tin(II) complexes LSnX [L = HC(CMeNAr)(2), Ar = 2,6-Pr2C6H3] with terminal methyl, amide, fluoride, and iodide (X = Me, N(SiMe3)(2), F, I) are described. LSnMe (2) is synthesized by salt metathesis reaction of LSnCl (1) with MeLi and can be isolated in the form of yellow crystals in 88% yield. Compound LSnN(SiMe3)(2) (3) was obtained by treatment of LH with 2 equiv of KN(SiMe3)(2) in THF followed by adding 1 equiv of SnCl2. Reaction of 2 and 3 respectively with Me3SnF in toluene provided the tin(II)fluoride LSnF (4) with a terminal fluorine as colorless crystals in 85% yield. 4 is highly soluble in common organic solvents, The reaction of LLi(OEt2) with 1 equiv of Snl(2) in diethyl ether afforded the LSnl (5). Compounds 2, 3, 4, and 5 were characterized by microanalysis, multinuclear NMR spectroscopy, and X-ray structural analysis. Single crystal X-ray structural analyses indicate that all the compounds (2, 3, 4, 5) are monomeric and the tin center resides in a trigonal-pyramidal environment.