in ethanol byproducts: sodium chloride; to soln. of Sn-compd. in abs. alc. was added ligand, mixt. refluxed for 3-4 h, concd. to half the vol., mixt. cooled, NaCl filtered, benzene added, mixt. refluxed for 2 h (trap), NaCl filtered, repetition of procedure until NaCl is completely removed; solvents were removed completely, residue dried in vacuo; complex recrystd. from ethanol; elem. anal.;

in acetonitrile T=50°C; 1 h;

polyethylene glycol 400 T=65 - 70°C; 5 h;

1: 2-furancarboxylic acid sodium salt With chloroformic acid ethyl ester in tetrahydrofuran T=20°C; 0.25 h; 2: Ph–ZnI With tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran T=70°C; Negishi-type cross-coupling; 14 h;