in benzene-d6 byproducts: H2; 25°C;

Catalyst: tri-n-butyl phosphine in benzene distannane, Te and phosphine placed in Schlenk tube under N2 atm. and dry benzene added, stirred at 80°C for 3 h; filtered to remove excess of Te, solvent evapd. in vac., residue washedwith pentane;

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in toluene transmetalation reaction in toluene at 90°C;;