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INDIRECT OXIDATIVE DEAMINATION OF BENZYLAMINES TO BENZALDEHYDES
Park, Koon Ha,Lee, Jae Bum 충남대학교 기초과학연구소 1992 연구논문집 Vol.12 No.-
Treatment of N-benzylarenesulfonamide(1) with potassium superoxide yields benzaldehyde(2) and arenesulfonamide(3). Deamination of benzylamine to benzaldehyde is achieved, in most cases, indirectly using various oxidants to make corresponding imines which could then be hydrolyzed in acidic conditions.^1-3 We report a simple and convenient indirect method for the conversion of benzylamine to benzaldehyde (Scheme 1). As shown in Scheme 1, N-benzylarenesulfonamide(1)^4 prepared from benzylamine and arenesulfonyl chloride gives benzaldehyde(2), an oxidatively cleaved product, and arenesulfonamide(3) in the presence of potassium superoxide^5-7 at room temperature.
Yoon, Minjoong,Choi, Hyong Hae,Kwon, Hwang Won,Park, Koon Ha 충남대학교 기초과학연구소 1988 연구논문집 Vol.8 No.-
The spectral properties of piroxicam in different solvents are similar to those of its skeletal precursor, HMBDC. The maximum absorption and emission wavelengths strongly depend on the hydrogen bonding ability of the solvent, and it is shown that intramolecular hydrogen bonding between the OH and the ortho carbonyl group of the parent benzothiazine ring plays an important role in the solvent-dependence of their spectroscopic properties. The fluorescence spectra in aprotic nonpolar solvent exhibit abnormally large Stokes-shifted (∼9,000㎝^-1) emission bands in contrast to the spectra in water. In ethanol, dual emission bands with two different fractional components of lifetimes have been observed. These results suggest that the abnormally red-shifted emission is attributed to the proton transferred form of an intramolecularly hydrogen-bonded closed conformer.
N-술피닐 파라-톨루엔술폰아미드와 아실 할라이드와의 반응 연구. N-아실 파라-톨루엔술폰아미드의 합성
전근,박명순,박영재,박균하 충남대학교 기초과학연구소 1997 忠南科學硏究誌 Vol.24 No.2
N-Sulfinyl p-toluenesulfonamide, a reactive organic intermediate, was reacted with 4 kinds of acyl halides such as acetyl, 2-chloroacetyl-, 3-chloropropionyl-, and 4-chlorobutyrylchloride to give N-acyl p-toluenesulfonamide. A possible reaction pathway for the formation of N-acyl p-toluenesulfonamide is proposed.
서일환,김경한,오미란,박균하,김문집,Suh Il-Bwan,Kim Kyung-Han,Oh Mi-Ran,Park Koon Ha,Kim Moon-Jib 한국결정학회 1997 韓國結晶學會誌 Vol.8 No.1
화합물내에 존재하는 다음 7가지 수소원자의 이상적인 위치들의 한가지 계산법을 보였다. (1) 3급 C-H, (2) 2급 C-H, (3) 1급 C-H, (4) 방향환 C-H와 N-H, (5) 수산기 O-H, (6) 말단평면내의 2개의 수소 (7) 선형인 X-C-H를 갖는 아세틸렌 C-H. A method for the calculation of the idealized hydrogen positions in the following seven different kinds of compounds has been shown: (1) tertiary C-H, (2) secondary C-H, (3) $CH_3$ group with tetrahedral angles, (4) aromatic C-H or amide N-H, (5) O-H group with X-O-H angle tetrahedral, (6) terminal $X=CH_2$ or $X=NH_2^+$ with the hydrogen atoms in a plane and (7) acetylenic C-H with X-C-H linear.
엄태형,고성만,서동수,양준환,박균하 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.6
The influence of reaction conditions on the MnZn ferrite coprecipitation process were investigated using mixed metla sulfate solution and ammonium oxalate. In order to minimize the metallic ion losses and to control the particle size, the optimum reaction conditions were as follows; reaction temperature $25^{\circ}C$, metal sulfate concentration 0.3M, molar ratio of ammonium oxalate/mixed metal sulfate 1.1:1. The production yield was as high as 97.6% of theoretical yield at optimum reaction condition.
전근,박명순,조병욱,박균하 충남대학교 기초과학연구소 1997 忠南科學硏究誌 Vol.24 No.2
Oxidation reactions of aniline derivatives with the use of NaOCl and CH_3CO_3H as oxidants were investigated and compared. It was found that 3- and 4-nitroanilines were oxidized to corresponding azobenzenes by NaOCl. On the other hand, azoxybenzenes were obtained in the reaction of 3- and 4-nitroanilines with CH_3CO_3H. 2-Nitroaniline was oxidized to benzofuroxan by NaOCl, while an unknown liquid product was formed by CH_3CO_3H. 4-Toluidine was oxidized to 4,4′-dimethylazobenzene with the use of CH_3CO_3H, but an unknown liquid product was formed by NaOCl. Benzamide was oxidized to N,N′-dibenzoylhydrazine and N-benzoylphenylhydrazine by NaOCl. Besides, p-toluenesulfonamide and benzenesulfonamide were unchanged by the two oxidants. The structures of all the products were identified by spectroscopic techniques such as IR, NMR and GC/MS.