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Intramolecular Diels–Alder Reaction of a Biphenyl Group in a Strained meta-Quaterphenylene Acetylene
At elevated temperatures, a strained, cyclic meta-quaterphenylene acetylene undergoes an intramolecular cyclization reaction to form benz[e]indeno[1,2,3-hi]acephenanthrylene. This reaction represents an example of a Diels–Alder reaction at the 2-, 1-, 1′-, and 2′-positions of a biphenyl derivati...
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Published in: | Journal of organic chemistry 2024-07, Vol.89 (13), p.9620-9626 |
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container_end_page | 9626 |
container_issue | 13 |
container_start_page | 9620 |
container_title | Journal of organic chemistry |
container_volume | 89 |
creator | Mittal, Komal Pham, Ashley V. Davis, Amanda G. Richardson, Abigail D. De Hoe, Clement Dean, Ryan T. Baird, Vi McDonald, Ashley Ringer Frantz, Derik K. |
description | At elevated temperatures, a strained, cyclic meta-quaterphenylene acetylene undergoes an intramolecular cyclization reaction to form benz[e]indeno[1,2,3-hi]acephenanthrylene. This reaction represents an example of a Diels–Alder reaction at the 2-, 1-, 1′-, and 2′-positions of a biphenyl derivative, a region analogous to the bay regions of perylene and other periacenes. The reaction proceeds cleanly with high conversion. Kinetics studies of a methylated derivative reveal that the ΔG ‡ for the reaction is ∼40–41 kcal/mol, and computational models predict a similar value of G rel for the transition state of a concerted [4 + 2]-cycloaddition. |
doi_str_mv | 10.1021/acs.joc.2c02280 |
format | article |
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title | Intramolecular Diels–Alder Reaction of a Biphenyl Group in a Strained meta-Quaterphenylene Acetylene |
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