Electronic spectra of 5,6-polymethylenethiapyrylium salts and certain oxygen analogs

Klimenko, S. K.; Evtushenko, I. Ya.; Pronin, A. F.; Stolbova, T. V.; Харченко, В. Г.

doi:10.1007/bf00504200

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2008

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“…The initial salts 1a,b and 2a,b were synthesized by known methods [6,7]. (1a,b) with Furfural, 5-Methylfurfural, or Thiophene-2-carbaldehyde (General Method).…”

Section: Methodsmentioning

confidence: 99%

Reaction of 4-R-2-phenyltetrahydrobenzo[b]pyrylium and 9-R-sym-octahydroxanthylium salts with furfural and related compounds

Sharafutdinov

Kapitonova

Klimenko

2008

Chem Heterocycl Comp

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It is known [1-3] that derivatives of cycloalka[b]chalcogenopyrylium salts are used as dyes in passive switches of optical quantum generators OQG [3], are used in photocompositions without silver salts [4], and exhibit biological activity [2]. Earlier we demonstrated that cycloalka[b]chalcogenopyrylium salts containing a γ-methyl group in the heterocycle and an α-methylene group in the alicycle react with aromatic aldehydes under harsh conditions at 100°C in a 1:3 mixture of acetic acid and acetic anhydride and form quantitative yields of the corresponding arylidene derivatives [1]. O Ph R O R + A + -A -1a,b 2a,b 1 A = BF 4 ; 2 A = ClO 4 ; 1,2 a R = H, b R = Ph __________________________________________________________________________________________ 1 Saratovorgsintez, Saratov 410059, Russia. 2 N. I. Vavilov Saratov

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“…The initial salts 1a,b and 2a,b were synthesized by known methods [6,7]. (1a,b) with Furfural, 5-Methylfurfural, or Thiophene-2-carbaldehyde (General Method).…”

Section: Methodsmentioning

confidence: 99%