In a series of six different cycloadditions of unsymmetrical quinones and alkyl-substituted butadienes, TiCl4 afforded considerable catalysis (–78 °C) and gave regioselectivity identical with that of the thermal reaction (200 °C) and therefore complementary to that BF3 catalysis.
J. B. Hendrickson and V. Singh, J. Chem. Soc., Chem. Commun., 1983, 837 DOI: 10.1039/C39830000837
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