Su R, He X, Houk KN, Lu Q, Liu F. Periselectivity and ambimodal transition states in cycloadditions of tetrachloro-o-benzoquinone with
6,6-dimethylfulvene.
J Comput Chem 2024;
45:752-760. [PMID:
38116842 DOI:
10.1002/jcc.27264]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 11/06/2023] [Accepted: 11/07/2023] [Indexed: 12/21/2023]
Abstract
The reaction mechanism of cycloadditions of tetrachloro-o-benzoquinone with 6,6-dimethylfulvene were systematically investigated with density functional theory calculations. It was found that conditional primary interactions stabilize the ambimodal transition states in the endo pathways. Ambimodal transition states lead to [6 + 4]/[4 + 2] adducts or [4 + 2]/[2 + 4] adducts, which interconvert through 3,3-sigmatropic shift reactions. The substituent effects on periselectivity were also investigated.
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