Acetals and Vinyl Ethers of Unsaturated Aldehydes and Ketones in the New Syntheses of Heterocyclic Compounds: XII. New Alternatives of ... View Full Text


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Article Info

DATE

2001-04

AUTHORS

E. P. Olekhnovich, S. L. Boroshko, I. V. Korobka, A. V. Metelitsa, L. P. Olekhnovich

ABSTRACT

1,3-Diethoxy-2-R-5,5-R',R'-1-cyclohexenylium perchlorates in condensation with 2-hydroxyarylaldehydes under dehydration conditions give rise to 3-ethoxy-1,2-dihydroxanthylium perchlorates that with the second molecule of 2-hydroxyarylaldehyde afford 13H-chromeno[3,2-b]xanth-5-ylium perchlorates, and with primary and secondary amines yield 3-(R2,R3-amino)-1,2-dihydroxanthylium perchlorates. The condensation of 2-bromodimedone with salicylaldehydes in triethyl orthoformate and perchloric acid medium furnished 6-bromo-13,13-dimethyl-13H-chromeno[3,2-b]xanth-5-ylium perchlorates. The latter compounds show strong fluorescence in 530-630 nm region with 0.48-0.98 quantum efficiency. Under similar conditions the dimedone and 2-acetyldimedone afford with 2-hydroxyarylaldehydes tris-condensation products: 2,10-dimethoxy-6-(3-methoxy-6-oxo-2,4-cyclohexadienylidenemethyl)-7,7-dimethyl-7H-chromeno[2,3-a]-xanth-13-ylium perchlorate and 2,10-dimethoxy-6-(6-methoxychromylium-2-yl)-13,13-dimethyl-13H-chromeno[3,2-b]xanth-5-ylium diperchlorate respectively. More... »

PAGES

527-538

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1012433903229

DOI

http://dx.doi.org/10.1023/a:1012433903229

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1051974684


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