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The use of solid-phase extraction with polymethacrylate for the gas chromatographic determination of dimethylamine, trimethylamine, ethylamine, triethylamine, propylamine, dipropylamine and tripropylamine in aqueous solutions was studied (detection limits of 0.7–1.0 μg dm −3 ).
Alkyl 2-chloroacetoacetates undergo a complex reaction with dialkyl acetylenedicarboxylates in the presence of triphenylphosphine to produce a nearly 1:1 mixture of the cis/trans isomers of dialkyl 5-acetyl-2-oxo-3-(triphenylphosphoranylidene)tetrahydrofuran- 4,5-dicarboxylates in excellent yields.
New estrone derivatives containing 1,2,4-triazin-5-one moieties were synthesised through direct C−C coupling of estrone 3-methyl ether with 1,2,4-triazinones
Iron oxide phases of ferromagnetic order obtained by the reductive decomposition of iron(II) oxalate in situ synthesised within intraspheric voids of photonic crystals based on SiO 2 were found and studied by TG, DSC and magnetic measurements.
The reaction of tetracyanoethylene and isobutyraldehyde or 2-ethylbutanal in an excess of a hydrohalogen acid yields 2-halo-6-hydroxy-5,5-dimethyl(ethyl)-5,6-dihydro-3,4,4(1 H )-pyridinetricarbonitriles, the crystal and molecular structures of which were characterised by IR, NMR, MS and X-ray...
Fully soluble rigid hydrocarbon hyperbranched polymers exhibit high inner surface areas.
The complexes M 2 (R 4 Pc) 3 (M = Y III , Tb III ) and MM’(R 4 Pc) 3 (M = Y III , Tb III , M’ = Lu III ), and R 4 Pc 2– = (4,5,4’,5’,4”,5”,4”’,5”’-tetrakis(1,4,7,10,13-pentaoxatridecamethylene)phthalocyaninate anion), were synthesised and characterised by UV-VIS and 1 H NMR...
Using NMR spectroscopy, we found that the reactions of 6-chloro-2-hydroxy-2-oxo-4-phenyl- and 2,6-dichloro-2-oxo-4-phenyl- benzo( e )-1,2-oxaphosphorinines with molecular bromine result in 3-bromo-6-chloro-2-hydroxy-2-oxo-4-phenyl- and 3-bromo-2,6-dichloro-2-oxo-4-phenylbenzo( e...
A new synthetic approach to 1-(alk-1-ynyl)cyclopropenes 2 by the reaction of 1-(alk-1-ynyl)-1-chlorocyclopropanes 1 with lithium N,N -dialkylamides has been developed. Alkynylcyclopropenes 2, obtained by this method in situ or isolated in individual state can add dialkylamide anions across the...
In rich hydrogen–air flames, a chemical reaction is shown (by numerical methods) to have two stages, i.e ., a low-temperature stage with quadratic branching and a high-temperature stage with linear branching; changes in the chemical flame structure due to propylene additives are more effective...
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