Zobrazeno 1 - 10
of 37
pro vyhledávání: '"Jong Pal Lee"'
Publikováno v:
Bulletin of the Korean Chemical Society. 32:3941-3946
Publikováno v:
Bulletin of the Korean Chemical Society. 32:1907-1911
A kinetic study is reported for nucleophilic substitution reactions of 4-pyridyl X-substituted benzoates 7a-e with a series of alicyclic secondary amines in H2O. The Bronsted-type plot for the reactions of 4-pyridyl benzoate 7c is linear with βnuc =
Autor:
Jong-Pal Lee, Young-Su Cho
Publikováno v:
Journal of Life Science. 20:1906-1909
Acid and halide ion catalyses for the hydrolysis of benzenesulfinamides were kinetically investigated. The rates of hydrolysis increased with increasing concentration of both acid and halide ions and also showed to speed up as the electron donating a
Publikováno v:
Bulletin of the Korean Chemical Society. 31:3588-3592
Summary of second-order rate constants ( k N ) for nucleophilicsubstitution reactions of 4-nitrophenyl benzoate 1c and 2-pyridyl ben-zoate 8c with alicyclic secondary amines in H 2 O at 25.0 ± 0.1 o C a entry Amines10 2 k N /M ‒1 s ‒1 1c 8c 1 pi
Publikováno v:
Bulletin of the Korean Chemical Society. 31:2801-2805
values (1.0 - 1.6) of the reaction and a good corre-lation of the rate constants with the reduction potentials of the aniline nucleophiles, the present reaction was initiated by a single electron transfer (SET). After this step, the reaction proceeds
Publikováno v:
Bulletin of the Korean Chemical Society. 31:1963-1967
O and MeOD) were also determined to exa-mine isotope effects. Additional rate constants were measured to obtain thermodynamic parameters of activation such as enthalpies of activation and entropies of activation which are summarized in Table 2.As sho
Autor:
Jong Pal Lee
Publikováno v:
Journal of the Korean Chemical Society. 53:814-818
시간에 대한 그래프의 기울기로부터 계산 된 값을 얻을 수 있는 Hewelett Packad사의 89532K Kinetic software (Serial No. 325GOO380)를 이용하여 반감기의 10배까지의 흡광도 값을 측정하여 반응속도상수를
Publikováno v:
Bulletin of the Korean Chemical Society. 30:1579-1582
The reaction rates of 4-X-2,6-dinitrochlorobenzenes (X=NO 2 , CN, CF 3 ) with Y-substituted pyridines (Y=3-OCH 3 , H, 3-CH 3 , 4-CH 3 ) in methanol-acetonitrile mixtures were measured by conductometry at 25 °C. It was observed that the rate constant
Autor:
Jong-Pal Lee
Publikováno v:
Journal of the Korean Chemical Society. 53:213-217
Autor:
Jong Pal Lee, Yong Hee Lee
Publikováno v:
Journal of the Korean Chemical Society. 52:450-453
반응기질의 합성 및 확인N-propionylbenzimidazole( 1a)과 N-propionyl-5-nitrobenz-imidazole(1b)의 합성은 10 mmol의 propionyl chloride에 대응되는 benzimidazole 10 mmol을 triethylamine존재 하에서 천천히 가하여 환류시켰