2005 Cycloaddition reactions O 0070 A Simple Cobalt Catalyst System for the Efficient and Regioselective Cyclotriof Alkynes. — Additional to the examples in the scheme, also internal 32- 050 merization unsymmetrical alkynes afford unsymmetrical benzene derivatives with good regioselectivity. — (HILT*, G.; VOGLER, T.; HESS, W.; GALBIATI, F.; Chem. Commun. (Cambridge) 2005, 11, 1474-1475; Fachbereich Chem., Philipps-Univ., D-35043 Marburg, Germany; Eng.) — M. Paetzel
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