title: Unexpected stereodynamic consequences of the restricted rotations in ortho-acyl- and ortho-vinyl biphenyls.
abstract: Surprisingly, the aryl-aryl rotation barriers of biphenyl derivatives ortho-substituted by the "small" HC=O and HC=CH2 groups (10.0 and 8.4 kcal mol-1, respectively) were found greater than those observed in biphenyls ortho-substituted by the "large" t-BuC=O and t-BuC=CH2 groups (6.7 and 6.9 kcal mol-1, respectively).
authors.affiliation: Department of Organic Chemistry A. Mangini, University of Bologna, Viale Risorgimento, 4 Bologna 40136, Italy.
authors.forename: Lodovico
authors.initials: L
authors.lastname: Lunazzi
authors.forename: Andrea
authors.initials: A
authors.lastname: Mazzanti
authors.forename: Mirko
authors.initials: M
authors.lastname: Minzoni