By Alan R. Katritzky
Validated in 1960, Advances in Heterocyclic Chemistry is the definitive serial within the area―one of significant value to natural chemists, polymer chemists and plenty of organic scientists. Written through validated professionals within the box, the excellent experiences mix descriptive chemistry and mechanistic perception and yield an realizing of ways the chemistry drives the properties.
- One of serious significance to natural chemists, polymer chemists and plenty of organic scientists
- Written by means of validated professionals within the box, the excellent experiences mix descriptive chemistry and mechanistic perception and yield an knowing of the way the chemistry drives the properties
Read Online or Download Advances in heterocyclic chemistry. 112 PDF
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Extra resources for Advances in heterocyclic chemistry. 112
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The present coumarin synthesis complements older established methods and offers significant advantages for the synthesis of coumarins. In contrast to the wellknown von Pechmann synthesis that necessitates strongly acidic conditions and frequently affords low and variable yields (13MI245) the following reactions offer promising practical routes to coumarins. Singh and coworkers have reported the synthesis of various 3-substituted-2H-chromen-2-ones 41 and benzo[f]2H-chromen-2-ones 42 from a condensation of 2-hydroxyarylaldehydes and α-oxoketene dithioacetals in the presence of InCl3 under solventless system (Scheme 31) (12T8683).
These azides show promising photophysical properties (Scheme 52) (11DP427). Orientation effects in the formation of coumarins via a Pechmann-type reaction using 13CNMR have been investigated by A. G. Osborne et al. A mixture of alkylcoumarins 124 was produced from the condensation of 4-acetyl resorcinole 123 with malic acid. 13CNMR study showed the production of 10% of 4-hydroxycoumarins as a minor product, whereas the reaction with EAA gives 7-hydroxycoumarins as sole products. The O-proximity effects on the 13CNMR of DMCs have been studied to reach this conclusion.