13 C- and 17 O-relaxation times measured in cyclic ethers, cyclic ketones, and lactones allowed the determination of the quadrupolar interaction at the O-site. Values obtained for six-membered rings can be used as standard values for ethers (χ = 13 MHz), ketones (χ = 10.5 MHz), and ...
Thio and selenophenols give thio-1 and seleno-1 chromones (Simonis reaction). Several cyclizing agents are studied. Ethyl acetylacetate is replaced by diketene. They give the Simonis reaction. From diketene we synthesize phenyl acetylthiol and selenolacetates which possess thiol or selenolester ...
The results obtained during this study are compared to those obtained from the reduction of the corresponding ketones by LiAlH4. [Journal translation]Jean-Claude RicherClaude Lamarrecanadian journal of chemistry
Département Science, ZYMA S.A. (Directeur Dr. P. Grumbach).doi:10.1002/hlca.19730560516FAO, RomeItaly). Tratado Internacional sobre los Recursos Fitogeneticos para la Alimentacion y la AgriculturaAGPHelvetica Chimica ActaSechaud J (1956) Helv Chim Acta 39:1257...
TOURN C M,TOURN G F,BRIANSO M C.Bis(undecatungstogermanato)uranate(IV)de cesium:C12 [U(GeW11 O39)2]13-14H2O [J].Acta Crystallogr B,1980,36:2012-2018.C. Tourné, G. Tourné, and M. Brianso (1980). Acta Crystallogr., Sect. B . 36 , 2012....
The testing is voluntary and is performed upon the companies applications for approval. The trials are carried out according to standardized Danish guidelines, most of which are based on ...Dufaud OlivierCorbel SergeDjf Rapport Markbrug
A set of mediterranean brown algae belonging to Cystoseira family is analysed by a G. L. C. and I. R. method. Easy determination of diterpenic compounds is presented. Among all the samples analysed, the only one Cystoseira elegans contains eleganolone, epoxy eleganolone and elegandiol as ...