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100%
Wiadomości Chemiczne
2000 [Z] 54, 3-4 203-226
EN The proton transfer reactions in solutions seem to be simple, yet a number of consecutive steps can be distinguished. The useful tool in determining the mechanisms of these reactions was, and still is the primary deuterium kinetic isotope effect]. Therefore the factors influencing the rate constants[...]
2
63%
Polish Journal of Chemistry
2001 Vol. 75, nr 12 1895-1903
EN 4-Nitrophenyl[bis(ethylsulphonyl)]methane has been synthesized and used in kinetic studies of proton abstraction induced by 1,1,3,3-tetramethylguanidine (TMG), 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) and 7-methyI-1,5,7-triazabicyclo[4.4.0]dec-5-ene (MTBD) bases in acetonitrile. The pK, values of t[...]
3
63%
Polish Journal of Chemistry
2001 Vol. 75, nr 11 1739-1743
EN Kinetics of the reaction of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) with tribenzylamine in acetonitrile has been measured spectrophotometrically. The product of this reaction is a stable anion radical of DDQ. The reaction is relatively slow, due to a considerable steric hindrance in both qui[...]
4
63%
Polish Journal of Chemistry
1999 Vol. 73, nr 10 1739-1744
EN The reaction of bromanil (2,3,5,6-tetrabromobenzoquinone)with 1,1,3,3-tetramethylguanidine in benzene has been studied spectrophotometrically. The reaction proceeds according to the mechanism of vinylic substitution with a charge-transfer complex as the intermediate compound. the final product is a [...]
5
63%
Polish Journal of Chemistry
2005 Vol. 79 / nr 6 1025-1032
EN The largest value of the homoconjugation constant in acetonitrile has been found for tribenzylamine KHOMO = 7.73 and the lower for N-methylpiperidine KHOMO = 3.44. For triethylamine, tri-n-propylamine, tributylamine, 1,3-diphenylguanidine, 2-tert-butyl- 1,1',3,3'-tetramethylguanidine, 1,1',2,2',3-pe[...]
6
51%
Wiadomości Chemiczne
EN The proton transfer reactions in solutions have attracted the attention of a number of laboratories for many years. These processes seem to be quite simple as they proceed without perturbation of bounding electrons and have low steric demands what enables study of their mechanism. However, many fact[...]
7
51%
Polish Journal of Chemistry
EN Nucleophilic vinylic substitution of 2,3,5,6-tetrachloro-1,4-benzoquinone by imidazole in acetonitrile and benzene has been studied spectrophotometrically. The reaction product is the diaminodichlorosubstituted quinone. The values of the activation parameters indicate that there is a considerable ch[...]
8
51%
Polish Journal of Chemistry
2006 Vol. 80, nr 12 2017-2029
EN Unexpectedly the reaction of deprotonation of carbon acids with phosphazene bases occurred very slowly. The kinetic study of the proton transfer reactions between C-acids of the series of nitroalkanes with increasing bulk of R = H, Me, Et, i-Pr substituents as 4-nitrophenylnitromethane (1), 1-nitro-[...]
9
51%
Journal of KONES
PL Artykuł prezentuje badania pojazdu zaopatrzonego w silnik diesla, zasilany olejem napędowym z c estrów metylowych kwasu tluszczowego(FAME). Badania były prowadzone na hamowni warunkach statycznych (charakterystyka obciążeniowa) i dynamicznych cyklach testu drogowego s Przepisów 83 ECE. Na bazie wyni[...]
EN The paper presents results of researching a vehicle equipped with diesel engine, fueled by diesel fuel with fatty acid methyl esters' additive. Research was conducted on chassis dynamometer in static conditions (load characteristics) and dynamic road test cycles according to 83 ECE Regulation. On th[...]
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