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Intramolecular Interconversion of syn- and anti-Tricarbonyl(1-ethoxy-1,2-dihydrocyclobutabenzene)chromium. Trapping of the ortho-Quinodimethane Intermediate

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Published in Angewandte Chemie. International edition in English. 1990, vol. 29, no. 4, p. 407-409
Abstract The reversible isomerization of syn-1 to anti-1 occurs without cleavage of metal-ligand bonds, as demonstrated through a [4 + 2] cycloaddition with trans-1,2-bis(trimethylsilyl)ethene as the dienophile, which led to the trapping of an ortho-quinodimethane intermediate. Further evidence comes from kinetic studies. Ring opening in 1 proceeds considerably more slowly than in the case of the non-complexed analogue, a finding that can be explained by entropy effects.
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Note Paru également dans Angewandte Chemie sous le titre: "Intramolekulare Umwandlung von syn- und anti- Tricarbonyl(1-ethoxy-1,2-dihydrocyclobutabenzol)chrom; Abfangreaktion des ortho-Chinodimethan-Intermediats" en 1990, 102(4), 421-423
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KUNDIG, Ernst Peter et al. Intramolecular Interconversion of syn- and anti-Tricarbonyl(1-ethoxy-1,2-dihydrocyclobutabenzene)chromium. Trapping of the ortho-Quinodimethane Intermediate. In: Angewandte Chemie. International edition in English, 1990, vol. 29, n° 4, p. 407-409. doi: 10.1002/anie.199004071 https://archive-ouverte.unige.ch/unige:6666

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