Results 311 to 320 of about 136,021 (344)

CONVERSION OF LACTONE INTO LACTONE HEMITHIOACETAL AND SYNTHESIS OF ENOL LACTONE

Chemistry Letters, 1981
Abstract Lactone hemithioacetal was synthesized in good yield from ω-phenylthiocarboxylic acid derived from lactone, and it was converted into enol lactone via the corresponding sulfoxide.
Kiyoharu Nishide, Manabu Node, Masahito Ochiai, Eiichi Fujita   +3 more
openaire   +3 more sources

Sesquiterpene Lactones as Allelochemicals

Journal of Natural Products, 2006
Six new sesquiterpene lactones, annuolide H (3), helivypolides F, H-J (4, 11-13), and helieudesmanolide A (6), together with known compounds, were isolated from polar bioactive fractions of Helianthus annuus cv. SH-222 and Stella fresh leaf water extracts.
Macias, Francisco A., Fernandez, Adriana, Varela, Rosa M., Molinillo, Jose M. G., Torres, Ascension, Alves, Pedro L. C. A.   +5 more
openaire   +4 more sources

Lactones 44. Microbial lactonization of γ-ketoacids

Journal of Molecular Catalysis B: Enzymatic, 2014
Abstract Enantiomerically pure γ-lactones ((+)-4a, (−)-5a, (+)-4b) have been obtained from the corresponding γ-ketoacids (3a and 3b) by their biotransformations with the three fungal strains: Rhodotorula glutinis AM242, Saccharomyces cerevisiae AM464 and Chaetomium sp. KCh6670.
Agata Białońska, Agnieszka Leśniak, Józef Kula, Czesław Wawrzeńczyk, Małgorzata Smuga   +4 more
openaire   +2 more sources

Synthesis of (+)-trans-Whisky Lactone, (-)-cis-Whisky Lactone, (+)-Cognac Lactone and (+)-Eldanolide

HETEROCYCLES, 1993
(+)-trans-Whisky lactone (5) and (-)-cis-whisky lactone (8), (+)-cognac lactone (9) and (+)-eldanolide (10) were synthesized starting from levoglucosenone (1) in optically pure ...
Hajime Matsushita, Hajime Yoshikoshi, Hiroshi Kawakami, Koji Okano, Takashi Ebata, Koshi Koseki, Katsuya Matsumoto, Takashi Ehata   +7 more
openaire   +2 more sources

Preparation of lactones via tricarbonyliron–lactone complexes

J. Chem. Soc., Perkin Trans. 1, 1981
A number of tricarbonyliron–lactone complexes have been prepared from vinyl oxirans by treatment with pentacarbonyliron. In certain cases two η3-allyl complexes were isolated from a single vinyl oxiran. Oxidation of the complexes by cerium(IV) ammonium nitrate in acetonitrile leads predominantly to β-lactones.
Steven V. Ley, Ramamoorthy Sivaramakrishnan, Christopher R. Self, Gary D. Annis   +3 more
openaire   +2 more sources

Resistance to Macrocyclic Lactones

Current Pharmaceutical Biotechnology, 2012
Resistance to the macrocyclic lactones (MLs) has been confirmed or suspected in many target organisms and is a serious problem in some. For some species, such as parasitic nematodes of small ruminants, ML resistance has become severe enough to threaten effective worm control worm control.
Adrian J. Wolstenholme, Ray M. Kaplan
openaire   +3 more sources

β-Lactone formation in a halogeno-lactonization reaction

J. Chem. Soc. D, 1971
The first example of β-lactone formation resulting from halogeno-lactonization of a βγ-unsturated acid is reported.
James C. McKenna, William E. Barnett
openaire   +2 more sources

Brominative lactonization in eudesmanes.

Tetrahedron Letters, 1990
Abstract The interaction of ilicic acid 1 with bromine affords directly the bromolactone 3 .
CECCHERELLI, Paolo, CURINI, Massimo, MARCOTULLIO, Maria Carla, ROSATI, Ornelio   +3 more
openaire   +2 more sources

Determination of homoserine as the lactone

Analytical Biochemistry, 1970
Abstract An accurate method for the analysis of homoserine has been developed which can be carried out in a reasonable time without requiring elaborate or expensive equipment. Homoserine is converted to the corresponding lactone by evaporation of the sample to dryness from a 3 N hydrochloric acid solution.
E. Voelkert, D.R. Grant
openaire   +3 more sources