Butatrienes as Extended Alkenes:  Barriers to Internal Rotation and Substitution Effects on the Stabilities of the Ground States and Transition States

P. D. Jarowski

Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, and Laboratorium für Organische Chemie, Eldgenössische Technische Hochschule, Hönggerberg, HCI, CH-8093 Zürich, Switzerland
F. Diederich

Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, and Laboratorium für Organische Chemie, Eldgenössische Technische Hochschule, Hönggerberg, HCI, CH-8093 Zürich, Switzerland
K. N. Houk

Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, and Laboratorium für Organische Chemie, Eldgenössische Technische Hochschule, Hönggerberg, HCI, CH-8093 Zürich, Switzerland