[Col2(PPh3)n]–zinc systems (n=1 or 2) exhibit high catalytic activity for the homo-Diels–Alder [2 + 2 + 2] cycloadditions of norbornadiene with various alkynes including terminal and internal acetylenes and methyl prop-2-ynyl ether to give the corresponding deltacyclenes in good to excellent yields.
I. Duan, C. Cheng, J. Shaw, S. Cheng and K. F. Liou, J. Chem. Soc., Chem. Commun., 1991, 1347 DOI: 10.1039/C39910001347
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