The intramolecular coupling of benzoannelated zincacyclopentadiene using CuCl2 produced 1,8-dibromobiphenylene selectively in a good yield. On the contrary, the intermolecular coupling of zincacyclopentadiene produced 2,3,6,7,10,11,14,15-octamethoxytetraphenylene selectively in a synthetically reasonable yield under different reaction conditions. The reactions of 2,2′-dilithio-4,4′,5,5′-tetramethoxybiphenyl and 2,2′-dilithio-4,4′,5,5′-tetrakis(tert-butyldimethylsilyloxy)biphenyl with CuCl2 in THF unexpectedly produced the corresponding tetraphenylene derivatives, instead of the desired biphenylene derivatives. Octamethoxytetraphenylene was used to synthesize octaacetoxytetraphenylene in a quantitative yield either directly or through octahydroxytetraphenylene.
用 CuCl2 与苯并
环戊二烯进行分子内偶联,可选择性地生成 1,8-二
溴联苯,收率很高。相反,在不同的反应条件下,
锌环戊二烯的分子间偶联选择性地生成了 2,3,6,7,10,11,14,15-八甲氧基四苯,合成收率合理。2,2′-dilithio-4,4′,5,5′-tetramethoxybiphenyl 和 2,2′-dilithio-4,4′,5,5′-tetrakis(tert-butyldimethylsilyloxy)biphenyl 与 CuCl2 在 THF 中的反应意外地生成了相应的四苯基衍
生物,而不是所需的
联苯衍
生物。八甲氧基
四联苯被用来直接或通过八羟基
四联苯定量合成八乙酰氧基
四联苯。