1. unpublished results a For a review see For related results of moderate success using organozincs see a;Negishi;Tetrahedron Am Chem SOC Chem Res Tetrahedron Ore Chem,1980
2. a;Negishi;Tetrahedron Am Chem SOC Tetrahedron Lett Ore Chem Tetrahedron Lett Tetrahedron Lett,1990
3. a;Dauben;Am Chem SOC Tetrahedron Lett Tetrahedron Len,1982