Untersuchungen über ätherartige Verbindungen, I. Mitteil.: Zur Darstellung der Acetale und Ketale

Biosynthesis of R‐(+)‐octane‐1’3‐diol. Crucial role of β‐oxidation in the enantioselective generation of 1’3‐diols in stored apples

“…Linoleic acid and soybean lipoxygenase were purchased from Sigma (St. Louis, MO); linoleic acid-13 C 18 from Isotec (Emmerich, Germany); [1-14 C]linoleic acid (58 mCi/mmol) from DuPont (Boston, MA); [U-14 C]oleic acid (768 mCi/mmol) from DuPont; [9,10,12, H]linoleic acid (60 Ci/mmol) from Biotrend (Cologne, Germany); [9,10,12,13,15,16]linolenic acid (120 Ci/mmol) from Biotrend; silica gel thin-layer chromatography (TLC) plates (0.25 mm, 60 F254) from Merck (Darmstadt, Germany). Solvents or reagents were of analytical or high-performance liquid chromatography (HPLC) grade.…”

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The biosynthesis of R-octane-1,3-diol and R-5(Z)octene-1,3-diol, two natural antimicrobial agents in apples and pears, was investigated in stored apples after application of [9,10,12,13-3 H]linoleic acid, [9,10,12,13,15, H]linolenic acid, [1-14 C]linoleic acid, [U-14 C]oleic acid, lipoxygenase-derived metabolites of [9,10,12,13-3 H]linoleic acid, 13 C 18 -labeled linoleic acid hydroperoxides, and 2 H-labeled octanol derivatives. Analysis of the products and quantification of incorporation and labeling pattern were achieved by high-performance liquid chromatography-radiodetection, capillary gas chromatography (GC)-isotope ratio mass spectrometry, and GC-mass spectrometry analysis.

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Préparation et oxydation anodique d'acides β-cétaliques. Application à la synthèse de γ-bisdioxolannes symétriques et des γ-dicétones dérivées

“…Tous les autres esters ont Ct C prCparCs selon la mCthode de Viscontini (I I) suivie d'une mkthanolyse (12). Les dioxolannes correspondants sont obtenus selon Salmi (13). Les dioxolannes substitubs en a du groupement dioxolanne ont dCji Ct C dCcrits dans la IittCrature (14,15 Dans la cellule non divisCe une solution de 0,l mol d'acide et de 0,Ol mol de potasse dans 100 mL de methanol sec est introduite.…”

THE RELATIVE EASE OF REDUCTIVE CLEAVAGE OF 1,3-DIOXOLANES AND 1,3-DIOXANES IN ETHER SOLUTION BY LiAlH4–AlCl3

“…2-Phenyl-1,s-dioxane was prepared by a modification of Salmi's procedure (16). A mixture of bcnzaldehyde (60 g, 0.57 mole), 1,s-propanediol (38 g, 0.5 mole, Eastman ICodali Co.), p-toluenes~~lphonic acid (1 g), and toluene (150 ml) was heated under reflux in a n apparatus equipped with a Dean-Starli water separator (17) until the requisite amount of water (9 ml) was removed.…”