Hydrogen bonding-assisted transformations of cyclic chalcones: E/Z-isomerization, self-association and unusual tautomerism

Condensation of 1- or 2-indanones and 1,3-indandiones with aromatic or heteroaromatic carbaldehydes gives products that demonstrate various transformations and effects of general interest for organic chemistry. In the present review, phenomena such as tautomerism, E/Z-isomerization, π-conjugation, h...

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Published in:Russian chemical reviews 2022-05, Vol.91 (5), p.RCR5035
Main Authors: Shainyan, Bagrat A., Sigalov, Mark V.
Format: Article
Language:English
Subjects:
Alkaloids
Chemical bonds
Condensates
Conjugation
Flavonoids
Hydrogen
Hydrogen bonding
Isomerization
Lactones
Natural products
NMR
Nuclear magnetic resonance
Organic chemistry
Piperidine
Quinoline
Quinones
Tautomers
Terpenes
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Sigalov, Mark V.
description Condensation of 1- or 2-indanones and 1,3-indandiones with aromatic or heteroaromatic carbaldehydes gives products that demonstrate various transformations and effects of general interest for organic chemistry. In the present review, phenomena such as tautomerism, E/Z-isomerization, π-conjugation, hydrogen bonding, and homo- and heteroassociation are considered. The relative stability of various isomers of cyclic chalcones is shown to be determined by the intramolecular hydrogen bonding in their molecules and the formation of associates. The same effects also result in the formation of unusual, otherwise unstable tautomers, such as 2H-indazoles. The hydrogen bonding-assisted keto-enol and E/Z-isomerization are analyzed. A novel, specific type of conjugation for the studied compounds was proposed and termed "roundabout" conjugation. The bibliography includes 101 references.
doi_str_mv 10.1070/RCR5035
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source Institute of Physics
subjects Alkaloids
Chemical bonds
Condensates
Conjugation
Flavonoids
Hydrogen
Hydrogen bonding
Isomerization
Lactones
Natural products
NMR
Nuclear magnetic resonance
Organic chemistry
Piperidine
Quinoline
Quinones
Tautomers
Terpenes
title Hydrogen bonding-assisted transformations of cyclic chalcones: E/Z-isomerization, self-association and unusual tautomerism
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