Results 181 to 190 of about 19,809 (222)

Vanillic Acid Glycoside and Quinic Acid Derivatives from Gardeniae Fructus

Journal of Natural Products, 2006
Bioassay-directed chromatographic fractionation of an ethyl acetate extract of Gardenia jasminoides (Gardeniae Fructus) afforded a new vanillic acid 4-O-beta-d-(6'-sinapoyl)glucopyranoside (1) and five new quinic acid derivatives, methyl 5-O-caffeoyl-3-O-sinapoylquinate (2), ethyl 5-O-caffeoyl-3-O-sinapoylquinate (3), methyl 5-O-caffeoyl-4-O ...
Hyoung Ja, Kim, Eun Jung, Kim, Seon Hee, Seo, Cha-Gyun, Shin, Changbae, Jin, Yong Sup, Lee   +5 more
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Terbium(III) complexes of (−)-quinic acid

Journal of the Less Common Metals, 1983
Abstract Complexation between terbium(III) and (−)-quinic acid (quin) (1,2,3,5-tetrahydroxycyclohexanecarboxylic acid) was studied by means of circularly polarized luminescence spectroscopy. [Tb]:[quin] ratios of 1:1, 1:2, 1:3, 1:5 and 1:10 were studied, and measurements of intermolecular energy transfer were used to determine pH regions in which the
Harry G. Brittain, Robert A. Copeland, Mark Ransom, Laura Spaulding   +3 more
openaire   +1 more source

Polycarbonates from the Polyhydroxy Natural Product Quinic Acid

Biomacromolecules, 2011
Strategies for the preparation of polycarbonates, derived from natural polyhydroxy monomeric repeat units, were developed for biosourced polycarbonates based on quinic acid. The design and synthesis of regioselectively tert-butyldimethylsilyloxy (TBS)-protected 1,4- and 1,5-diol monomers of quinic acid were followed by optimization of their ...
Céline J, Besset, Alexander T, Lonnecker, Jennifer M, Streff, Karen L, Wooley   +3 more
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Quinic acid esters from Isertia haenkeana

Phytochemistry, 1991
Abstract From the leaves of Isertia haenkeana three previously known compounds have been isolated. In addition, five new quinic acid esters were also obtained from the same source. Their structures have been established by spectroscopic means.
A. Rumbero-Sanchez, P. Vazquez
openaire   +1 more source

EXTRACTION OF SHIKIMIC AND QUINIC ACIDS

Chemical Engineering Communications, 1999
Abstract Solvent extraction using an extractant/diluent system was evaluated for the recovery of shikimic and quinic acids. Tridodecylamine (TDA) was used as the extractant, and 1-heptanol as the diluent. TDA complexes with the acid resulting in an acid-amine complex, which is solvated by the alcohol diluent. In back extraction, oleic acid was added to
MARIAM SADAKA, ANTONIO GARCIA
openaire   +1 more source

Synthesis of Polyhydroxycyclohexanes and Relatives from (−)-Quinic Acid

The Journal of Organic Chemistry, 2003
An efficient and versatile strategy for the synthesis of polyhydroxycyclohexanes and related compounds 3-6 is reported. The successful synthesis of these analogues has been achieved from a common intermediate, quinic acid derived lactone 2, rapidly accessible from cheap and commercially available (-)-quinic acid (1) as a chiral template.
Concepción, González, Montserrat, Carballido, Luis, Castedo   +2 more
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A synthesis of l-(+)-quinic acid from d-(–)-quinic acid

Canadian Journal of Chemistry
Here, we report an efficient synthesis of l-(+)-quinic acid from the natural product d-(–)-quinic acid in a 12-step sequence. The key steps involve the kinetic controlled selective protection of a lactone intermediate and the inversion of two stereocentres: the C-3 and C-5 hydroxyl of the quinic acid core using optimized oxidation–reduction conditions.
Johnny Nguyen, Sandeep Bhosale, Andrew J. Bennet   +2 more
openaire   +1 more source

Quinic Acid Aromatization in the Rat. Urinary Hippuric Acid and Catechol Excretion Following the Singular or Repeated Administration of Quinic Acid

Xenobiotica, 1973
Abstract1. Hippuric acid (12·3% of the dose) and catechol (1·0% of the dose) were found as urinary metabolites when (-)-quinic acid (100 mg) was administered orally to rats. Neither protocatechuic acid nor vanillic acid was detected.2. No significant differences in the extent of urinary excretion of hippuric acid and catechol were found when the quinic
S R, Indahl, R R, Scheline
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Synthesis of carba-sugars from (−)-quinic acid

Tetrahedron Letters, 2001
Abstract (1 S ,2 R ,3 R ,4 S ,5 R )- ( 3a ) and (1 S ,2 S ,3 S ,4 S ,5 R )-1,2,3,4,5-pentahydroxy-1-hydroxymethylcyclohexane ( 4a ), (1 R ,2 R ,3 R ,4 S ,5 R )- ( 3b ) and (1 R ,2 S ,3 S ,4 S ,5 R )-1,2,3,4,5-pentahydroxycyclohexan-1-carboxylic acid ( 4b ) are reported.
Montserrat Carballido, Luis Castedo, Concepción González   +2 more
openaire   +1 more source

Bioavailability and metabolism of chlorogenic acids (acyl‐quinic acids) in humans

Comprehensive Reviews in Food Science and Food Safety, 2020
Abstract Acyl‐quinic acids (chlorogenic acids) are produced by many plants, including fruits, vegetables, and herbal remedies, with coffee and maté particularly rich dietary sources. Epidemiological and intervention studies suggest that they can reduce the risk of developing type 2 diabetes and cardiovascular ...
Michael N. Clifford, Asimina Kerimi, Gary Williamson   +2 more
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