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The reaction of some 4‐pyrones with activated isocyanates
Author(s) -
Van Allan J. A.,
Chang S. Chie,
Reynolds G. A.
Publication year - 1974
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570110216
Subject(s) - chemistry , isocyanate , conjugated system , pyran , reaction conditions , organic chemistry , medicinal chemistry , polymer chemistry , polyurethane , catalysis , polymer
The pyrones, 2,6‐diphenyl‐4 H ‐pyran‐4‐one, flavone, and 2‐phenyl‐4 H ‐naphtho[2,1‐ b ]pyran‐4‐one reacted with activated isocyanates, such as trichloroacetyl isocyanate, giving 4‐trichloroacetylimino derivatives. These acylimino compounds underwent a slow reaction with a second mole of isocyanate to give a bisiminopyran. It is shown that carbonyl groups that are conjugated with electron‐releasing groups will react with activated isocyanates.