Zur Spezifität der Vitamin E-Wirkung

Werder, F. v.; Moll, Th.; Jung, F

doi:10.1515/bchm2.1939.257.2-4.129

Cited by 14 publications

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“…The most frequently used procedure for the preparation of allophanates is the reaction of an alcohol with cyanic acid. Cyanuric acid is depolymerized to cyanic acid in a stream of carbon dioxide or nitrogen and passed into the alcohol (23,84,95,129,130,165,194,210,219) or into a solution of the alcohol in an inert solvent (108,222). Alternatively, the cyanic acid may be condensed (b.p.…”

Section: A From Cyanic Acidmentioning

confidence: 99%

Allophanates.

Blohm¹,

Becker²

1952

Chem. Rev.

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concerning this article should be addressed to Ernest I. Becker at the Poly technic Institute of Brooklyn.4 Allophane: Greek allophanes, "appearing otherwise," from alios (otherwise) + phainesthai (to appear). 5 The term has also been used to describe a class of inorganic aluminum silicates. These are not under consideration here. Although «-and 7-substituted allophanates are also known, the discussion has been limited to esters of the unsubstituted acid:

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Section: A From Cyanic Acidmentioning

confidence: 99%

Allophanates.

Blohm¹,

Becker²

1952

Chem. Rev.

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ThePechmann Reaction

Sethna

Phadke

2011

Organic Reactions

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H. v. Pechman found that coumarin derivatives are formed when malic acid or beta‐ketonic esters are condensed with phenols in the presence of concentrated sulfuric acid. This reaction is commonly known s the Pechmann reaction. It has found extensive use. Simonis and co‐workers used phosphorus pentaoxide as the condensing agent in place of sulfuric acid and demonstrated that with the same reactants chromones rather than coumarins resulted. The condensation of a phenol and beta‐ketonic ester in the presence of phosphorus pentaoxide is sometimes called the Simonis reaction, but it is actually a variation of the Pechmann reaction and is considered in this chapter. Other condensing agents that have been used, for example, are phosphorus oxychloride, phosphoric acid, zinc chloride and others. These are discussed in the chapter. By condensing appropriately substituted phenols and beta‐ketonic esters, coumarins can be synthesized with substituents either in the benzene nucleus in the heterocyclic ring or both. The course of this reaction depends on three factors; nature of the phenol, of the beta‐ketonic ester, and the condensing agent.

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Alkylchromones

Ellis¹

1977

Chemistry of Heterocyclic Compounds: A Series of Monographs

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Zur Spezifität der Vitamin E-Wirkung

Cited by 14 publications

References 0 publications

Allophanates.

Allophanates.

ThePechmann Reaction

Alkylchromones

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