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A novel quinone methide from dimerization of the quinone methide 4-allylidene-2,6-dimethyl-cyclohexa-2,5-dienone

✍ Scribed by Jacqueline A. Hemmingson


Publisher
Elsevier Science
Year
1977
Tongue
French
Weight
143 KB
Volume
18
Category
Article
ISSN
0040-4039

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Stabilization of ortho-quinone methides
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The zwitterionic intermediates (2a) in the oxidation of ortho-alkylphenols (1) and bis(sulfonium ylide) 3 form reasonably stable 2:1complexes (4), in which the ortho-quinone methide (oQM) moieties are not present in quinoid form with the exocyclic in-plane methylene group, but as zwitterionic, aroma