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2005
Ring closure reactions
O 0130
[5 + 1] Annulation: A Synthetic Strategy for Highly Substituted Phenols and Cy— α-Oxo ketene-S,S-acetals are used as five-carbon 1,5-bielectrophilic
33- 050 clohexenones.
components in the [5+1] annulation reaction with nitroalkanes as the one-carbon nucleophilic components. Depending on the reaction temperature, either cyclohexenones
or phenols are isolated as reaction products. Obviously, the cyclohexenones are very
stable intermediates which are converted at higher temperatures into phenols via an
aromatization process. — (BI, X.; DONG*, D.; LIU, Q.; PAN, W.; ZHAO, L.; LI, B.;
J. Am. Chem. Soc. 127 (2005) 13, 4578-4579; Dep. Chem., Northeast Norm. Univ.,
Changchun 130024, Peop. Rep. China; Eng.) — Klein
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