in methanol; toluene byproducts: NaCl; (Ar); Schlenk tube technique; Bu2SnCl2 in toluene was added dropwise toNaOC(CH3)3 in methanol; mixt. was refluxed for 6 h; NaCl was centrifuged; solvent was removed in vac.; residue was distd. under reduced pressure; elem. anal.;