Novel cobalt-catalyzed [2+2+2] cycloaddition using fluorine-containing alkynes was described. Cyclotrimerization of fluorinated alkynes under the influence of CoCl₂(dppb) in acetonitrile at 80 °C for 3 h took place smoothly, affording the corresponding benzene derivatives in excellent yields with high regioselectivity. Additionally, intermolecular cycloaddition of fluorinated alkynes with non-fluorinated diynes also proceeded in the presence of a catalytic amount of CoCl₂((S)-BINAP) and ZnI₂ to give various bicyclic aromatic compounds in high yields.

中文翻译：

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高度区域选择性的钴催化的含氟内部炔烃的[2 + 2 + 2]环加成反应，以构建各种氟代烷基化的苯衍生物

描述了使用含氟炔烃的新型钴催化的[2 + 2 + 2]环加成反应。在CoCl ₂（dppb）在乙腈中于80°C的影响下，氟化炔烃的环三聚反应顺利进行了3 h，从而以高收率和高区域选择性提供了相应的苯衍生物。另外，在催化量的CoCl ₂（（S）-BINAP）和ZnI ₂的存在下，氟化炔烃与非氟化二炔的分子间环加成也以高收率得到各种双环芳族化合物。