ChemInform Abstract: REACTIONS OF 1,5‐PENTADIEN‐3‐ONES, 12. SYNTHESIS AND STRUCTURE OF 7,11‐DIPHENYL‐2,4‐DIAZASPIRO(5.5)UNDECANE‐1,3,5,9‐TETRAONES, I

Otto, H.; Triepel, Jochen

doi:10.1002/chin.197707225

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2017

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“…59-173.70. This explains that the replacement of a carbonyl group by a thiocarbonyl group results in a downfield shift (Otto et al, 1976;Ahmed et al, 2005).…”

Section: Resultsmentioning

confidence: 99%

One step cyclocondensation of (thio) barbituric acid with chalcones in glacial acetic acid and phosphorous pentoxide, Part-II

Akhter

Halim

Ahmed

et al. 2017

Bangladesh J. Sci. Ind. Res.

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A number of new 5, 7-diaryl-1,5-dihydro (or 1, 2, 3, 5-tetrahydro)-pyrano [2, 3-d] pyrimidin-2, 4-diones (or 2-thioxo-4-ones) (3a-g) have been synthesized in one-step by cyclocondensation of barbituric acid or thiobarbituric acid (1) with arylideneacetophenones (2a-d), in glacial acetic acid in the presence of phosphorous pentoxide. The structures of the compounds 3a-g have been determined by UV, IR, 1H NMR, 13C NMR, mass spectral data and elemental analyses. The compounds 3a-g do not seem to be available in the literature.

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“…59-173.70. This explains that the replacement of a carbonyl group by a thiocarbonyl group results in a downfield shift (Otto et al, 1976;Ahmed et al, 2005).…”

Section: Resultsmentioning

confidence: 99%

One step cyclocondensation of (thio) barbituric acid with chalcones in glacial acetic acid and phosphorous pentoxide, Part-II

Akhter

Halim

Ahmed

et al. 2017

Bangladesh J. Sci. Ind. Res.

View full text Add to dashboard Cite

show abstract

ChemInform Abstract: REACTIONS OF 1,5‐PENTADIEN‐3‐ONES, 12. SYNTHESIS AND STRUCTURE OF 7,11‐DIPHENYL‐2,4‐DIAZASPIRO(5.5)UNDECANE‐1,3,5,9‐TETRAONES, I

Abstract: Aus dem Dienon (I) und den Barbitursäuren (II) entstehen in Gegenwart z.B. von Na‐alkanolaten in basenkatalysierter Reaktion die Titelverbindungen (III), die teilweise als Isomerengemische vorliegen und von harzigen Nebenprodukten begleitet werden.

Cited by 1 publication

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One step cyclocondensation of (thio) barbituric acid with chalcones in glacial acetic acid and phosphorous pentoxide, Part-II

One step cyclocondensation of (thio) barbituric acid with chalcones in glacial acetic acid and phosphorous pentoxide, Part-II

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