Aliphatic Hydroxyketones Research Articles

Novel volatile thermal degradation products of thiamine

Thirteen compounds (nine thiophenes, two alicyclic sulphur compounds and two aliphatic hydroxyketones) are reported as novel thermal degradation products of thiamine. Most possessed meaty and/or onion-like aromas.

The effect of xylose on the generation of volatiles from heated thiamine

Isolates of volatile thermal degradation products of xylose, thiamine and xylose-thiamine mixtures were prepared by continuous steam distillation-solvent extraction, and 11, 40 and 57 components were identified, respectively, from each isolate. Pentane-2,3-dione was the most abundant component of the xylose isolate at 34% of the total volatiles. Sulphur compounds predominated in both the thiamine and xylose-thiamine isolates, with 34 and 43 representatives, respectively, being identified in each sample. Thirteen compounds are reported for the first time as thiamine thermal degradation products, and include 2-methylthiophen-3-thiol, 2-methylthiophen-4-thiol, and their 2,3-dihydro and 4,5-dihydro derivatives, three other thiophen derivatives, two alicyclic sulphur compounds and two aliphatic hydroxyketones. The addition of xylose to the model system resulted in the identification of 27 components which could not be detected from xylose or thiamine alone, and 16 (15 of which are sulphur-containing) may form as a result of xylose-thiamine interactions. They include four bicyclic structures and four alicyclic sulphur components. The presence of xylose also resulted in a 4–5-fold increase in formation of the potent meaty odour compound, 2-methylfuran-3-thiol.

Aliphatic hydroxyketones from Adhatoda vasica

Two new aliphatic hydroxyketones, isolated from the aerial parts of Adhatoda vasica have been characterized as 37-hydroxyhexatetracont-1-en-15-one and 37-hydroxyhentetracontan-19-one, respectively, on the basis of spectral data and chemical studies.

ChemInform Abstract: Convergent Approaches to the Syntheses of Long‐Chain Aliphatic Hydroxy Ketones: Potential Bioactive Compounds of Plant Origin.

AbstractThe title compounds (VII) and (XI) are prepared as shown.

Aliphatic hydroxy-ketones from Adenocalymma alliaceum leaves

Two new aliphatic hydroxy-ketones, isolated from the leaves of Adenocalymma alliaceum (Bignoniaceae) have been characterized as 32-hydroxyhexatriacontan-4-one and 19-hydroxyhexatriacontan-18-one by spectral data and chemical studies.

Aliphatic hydroxy-ketones from Curculigo orchioides rhizomes

Two new aliphatic hydroxy-ketones, isolated from the rhizomes of Curculigo orchioides, have been characterized as 27-hydroxytriacontan-6-one and 23-hydroxytriacontan-2-one, respectively, by spectral data and chemical studies.

Molecular structure and photochemical reactivity. X. Aliphatic hydroxy ketones

Molecular structure and photochemical reactivity. X. Aliphatic hydroxy ketones