Über einige Farbreaktionen

Korenman, I. M.

doi:10.1007/bf01369890

Cited by 7 publications

(1 citation statement)

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“…The Komarowsky reaction has been studied extensively by Swiss and German chemists (6,8,12,19). Aldehydes which have been employed as reagents include the following: salicylaldehyde, benzaldehyde, p-dimethylaminobenzaldehyde, furfural, veratric aldehyde, and vanillin.…”

Section: Colorimetric Methodsmentioning

confidence: 99%

Determination of Higher Alcohols in Distilled Liquors

Penniman¹,

Smith²,

Lawshe³

1937

Ind. Eng. Chem. Anal. Ed.

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A DISTILLED liquor may be regarded as an ethanolwater solution containing small quantities of certain secondary constituents (2) which usually amount to less than 1 per cent of the whole.The secondary constituents, which impart to the beverage its characteristic flavor and bouquet, may be divided into three groups: (a) substances derived from the original grain or other starting material by the processes of fermentation, distillation, etc.; (b) reaction products formed during aging, particularly as a result of esterification and oxidation; (c) flavor-producing substances added or extracted from wood.The first group-i. e., the flavor-producing materials which are inherent in the freshly distilled liquor-consist chiefly of the higher alcohols and their esters. The higher alcohols are grouped together under the collective designation fusel oil, which in analytical practice includes not only the free alcohols but also those portions which are esterified, the esters being decomposed by saponification before the higher alcohols are determined.Fusel oil content furnishes one of the principal criteria for judging the type, quality, and purity of a distilled liquor, and for this reason its determination is of importance in the chemical examination of such a beverage. The various methods of fusel oil determination depend either upon an approximate separation of the higher alcohols from the ethanolwater solution by means of extraction, or on colorimetric reactions exhibited by the higher alcohols but not by ethyl alcohol. The available methods are defective in various ways,

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Section: Colorimetric Methodsmentioning

confidence: 99%

Determination of Higher Alcohols in Distilled Liquors

Penniman¹,

Smith²,

Lawshe³

1937

Ind. Eng. Chem. Anal. Ed.

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Farbreaktionen über intermediär gebildete Cyclopentenylkationen

Auterhoff

Bertram

1974

Archiv der Pharmazie

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Menthol gibt mit konzentrierter Schwefelsaure ein Gemisch gesattigter und ungesattigter Kohlenwasserstoffe, von denen letztere uber Cyclohexenylkationen Cyclopentenylkationen geben, die mit Vanillin zu farbigen Produkten von Fukncharakter reagieren. Auf Grund dieses allgemeinen Reaktionsweges ist die Mentholreaktion nur rehtiv spezifisch; so gibt z.B. auch Borneo1 die gleichei Endprodukte wie Menthol p-Cymol gibt mit Vanillin-Schwefelsaure eine Violettf~bung wie Menthol, es entsteht aber ein anderes Endprodukt von Phenylindancharakter; die Mentholreaktion verlauft nicht uber p-CymoL In der Reaktion kann Vanillin durch eine Reihe anderer aromatischer Aldehyde mit geeigneter Substitution und die konzentrierte Schwefelsaure durch 72proz. Perchlorsaure ersetzt werden. Colour Reactions via Cyclopentenyl CationsIn concentrated sulphuric acid menthol gives a mixture of saturated and unsaturated hydrocatbons. From the unsaturated hydrocarbons cyclopentenyl cations arise which react with vanillin to coloured substances with fulvene structure. The menthol reaction ist relatively unspecific;for example borneol gives the same reaction products. p-Cymene is not an intermediate in the menthol reaction with vanillin and sulphuric acid. A violet colour ist produced but the reaction product in this case has phenylindane character.In the reaction vanillin can be replaced by other aromatic aldehydes and concentrated sulphuric acid by 72 % percholric acid.

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Über die Spezifität der KOMAROWSKY‐Reaktion zur Fuselölbestimmung in Primasprit und absolutem Alkohol

Bergander

Babel

1964

Nahrung

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Über einige Farbreaktionen

Cited by 7 publications

References 0 publications

Determination of Higher Alcohols in Distilled Liquors

Determination of Higher Alcohols in Distilled Liquors

Farbreaktionen über intermediär gebildete Cyclopentenylkationen

Über die Spezifität der KOMAROWSKY‐Reaktion zur Fuselölbestimmung in Primasprit und absolutem Alkohol

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