Formylation of 2,7-di-tert-butylpyrene with dichloromethyl methyl ether in the presense of AlCl3 afforded a mixture of 2,7-di-tert-butylpyrene-4,9-biscarbaldehyde and 4,10-biscarbaldehyde in the ratio of 75:25, from which the corresponding bis(arylethynyl)pyrenes were obtained by the Wittig reaction with aryl methyl phosphonium ylides followed by bromination and dehydrobromination.

中文翻译：

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2,7-二叔丁基-4,9-双(芳乙炔基)-和4,10-双(芳乙炔基)芘的合成和光谱性质

2,7-二叔丁基芘与二氯甲基甲醚在AlCl3存在下甲酰化得到2,7-二叔丁基芘-4,9-双甲醛和4,10-双甲醛的比例为75 :25，通过与芳基甲基鏻叶立德的 Wittig 反应，然后溴化和脱溴化氢，从中获得相应的双（芳基乙炔基）芘。