1,721,005 research outputs found
Attempted Nucleophilic Attack of Cyanide Ion on alfa-beta-unsaturated p-Tosylhydrazones.
No full textThe reactivity of alfa-beta-unsaturated p-Tosylhydrazones toward ion cyanide as nucleophile. In a aqueous-dichloromethane two-phases reaction, using benzyltriethyammonium chloride as a phase-transfer catalyst, we obtained hydrocyanation of tosylhydrazones of cycloexanone and other unconjugated substrates, while the C=N of conjugated one, resists nucleophilic attack of cyanide ion
Composizione ed evoluzione del profumo di alcuni fiori del territorio modenese.
No full textLa composizione del profumo dei fiori di Syringa Vulgaris si modifica durante il periodo della fioritura. Le variazioni dei componenti volatili sono state analizzate e messe in correlazione con analoghi cambiamenti da noi riscontrati in altre specie vegetali
N-N Bond Cleavage of 1-Acyl-2p-tosylhydrazines with Sulphur Mono- and Di-chloride.
No full textThe distribution of main products of the reaction of 1-Acyl-2p-tosylhydrazines with S2Cl2, SCl2, SOCl2 and SO2Cl2 is summarized
Comments on Truffle Aroma Analysis by Headspace Solid Phase Microextraction [Is butylated hydroxytoluene (BHT) a "natural "volatile constituent of truffles?]
No full textGC-MS represents a powerful analytical thecnique that allows a quick and easy determination of VOCs. But the great deal of structural data should be examined critically in order to avoid mistakes
The action of Sulphuryl Chloride on p-Tosylhydrazones
No full textThe reaction of sulphuryl chloride with different substituted p-Tosylhydrazones is found to afford various geminal dichloro-hydrocarbons, the parent carbonyl compounds, or alfa-alfa-dichloroaldehydes; a reaction mechanism involving two competing pathways is proposed
Methyl beta-Orcinolcarboxylate and Depsides from Parmelia Furfuracea
No full textParmelia furfuracea, a common conifer lichen, produce antimicrobical constituents whose extracts have been utilized to give base materials for perfumes. Crude extracts of this lichen were tested against representative different class of microorganisms. A strong activity was exhibited against Bacillus subtilis and Escherichia col
The Intermediacy of Iridodial in the Biosynthesis of Dolicholactone in Teucrium Marum
No full textFeedings experiments using 3H-labelled cyclopentane monoterpenes show that in dolicholactone two hydride sfifts give rise to lactone ring and olefinic bond formation
Chlorination of Alkenes with Manganese Dioxide-Trimethylchlorosilane
No full textThe title reagent system (MnO2-TMCS) give rise to a smooth and high-yeld chlorinationof unconiugated alkenes without isomerization occurring. The trans vic-dichloro derivatives are obtained from cyclic substrates with high stereoselectivity
Conformational Aspects of Agerol, A Ten-Membered-Ring Sesquiterpene
No full textThe conformation of agerol, a ten-membered-ring sesquiterpene fron Achillea ageratum, has been investigated by means of NMR and molecular mechanics calculations (GEMO program). The more stable formis very similar to that previously determined foe the corresponding diepoxide and accounts for the reactivity of the molecule. The minimization strain-energy procedure has been extended to compounds obtained by rearrangement of the cyclodecane skeleton of agerol
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