Chemistry Letters, Vol.29, No.12, 1408-1409, 2000
Alternative synthesis of (Z)-1-aryl-1-(tributylstannyl)-2-(triethylgermyl)ethenes and the unprecedented germyl 1,2-migration during the destannylation of the adducts
A specific combination catalyst, Pd(dba)(2) and 4-ethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane effectively catalyzed the addition of tributyl(triethylgermyl)stannane to arylacetylenes in tetrahydrofuran to give (Z)-1-aryl-2-(germyl)-1-(stannyl)ethenes in high yields. The (Z)-1-aryl-2-(germyl)-1-(stannyl)ethenes were subject to the unprecedented germyl 1,2-migration during the destannylation using HI / TBAI in toluene to produce 1-aryl-1-(germyl)ethenes in high yields.