Four calix[5]arenes, which have three different substituents at the upper rim of calix, are synthesized by the ‘3+2’ fragmentation condensation reaction. An equimolar mixture of p-substituted phenol trimer (BCB) and 2,2’-bishydroxymethyl p-substituted phenol dimer (AA) was refluxed for 3.5 days in xylene to produce calix[5]arenes 5a-d in 27-32% isolated yield. The structure of the calix[5]arenes was established by elemental analysis and 1H NMR/13C NMR spectroscopy.
通过“3+2”碎裂缩合反应合成了四种杯[5]
芳烃,它们在杯的上缘具有三种不同的取代基。将等摩尔的p-取代
苯酚三聚体(BCB)和2,2’-双羟甲基p-取代
苯酚二聚体(
AA)在二
甲苯中回流3.5天,得到分离产率为27-32%的杯[5]
芳烃5a-d。通过元素分析和1H NMR/13C NMR光谱确定了杯[5]
芳烃的结构。