Palladium catalysed cyclisations creating products possessing spiro-, fused- and bridged-rings, and tetrasubstituted carbon centres as mixtures of double bond isomers are modified to give single products in the presence of Tl(1) salts.
钯催化的环化生成具有螺环,稠环和桥环以及双取代异构体混合物的四取代碳中心的产物,在Tl(1)盐的存在下经过修饰可得到单一产物。