Ruthenium-catalyzed [2+2] cycloadditions of 2,3-disubstituted norbornadienes and 2-substituted norbornadienes with an alkyne were found to be highly chemo- and stereoselective with moderate level of regioselectivities and only small rate differences were observed with different substituents on the norbornadiene. © 2002 Elsevier Science Ltd. All rights reserved.
Jordan, R. W., & Tam, W. (2002). Reactivity of the alkene component in the ruthenium-catalyzed [2+2] cycloaddition between an alkene and an alkyne: Part 2. Tetrahedron Letters, 43(34), 6051–6054. https://doi.org/10.1016/S0040-4039(02)01191-7