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Park, Gyoosoon 국민대학교 2003 기초과학연구소 논문집 Vol.22 No.-
비선형 광학 유기화합물에서 1,30-헤테로고리 (옥사졸, 이미다졸, 티아졸)의 치환에 따른 β값을 Hatree-Fock 법으로 예측하였다. 예측된 β값을 네가지 (matched, mismatched, favorable와 unfavorable)의 상대적 방향성에 따라 비교분석하였으며, 치환 형태가 ‘matched’와 ‘favorable’일 때 β값이 최대화 될 수 있다는 결론을 얻었다. 또한 헤테로고리의 H-C4와 페닐기의 H-C3 (or H-C5)의 입체효과가 전체분자의 β값에 영향을 준다는 사실을 얻어내었다. 이상의 결론은 유기 비선형 광학물질을 개발하는데 중요한 지표로 이용될 수 있다. The first hyperpolarizabilies (β) of the donor-acceptor systems (D-A) containing several 1, 3-heteroaromatic π-bridging units (oxazole, imidazole, and thiazole) have been studied by ab initio method (HF/6-31G). The effects of the relative orientation of the heteroaromatic rings (HR) on the molecular hyperpolarizability (β) were interpreted in terms of the dipole orientation (matched vs. mismatched) and the substitution pattern (favorable vs. unfavorable) in D-HR-A systems. Largest hyperpolarizabilities were predicted for all the systems when they have the "matched" orientation of the dipole moment and the "favorable" substitution pattern. Noteworthy is the steric interaction between H-C4 of the heteroaromatics and H-C3 (or H-05) of the phenyl moieties plays a crucial role in controlling the overall hyperpolarizability of the chromophores. This result may serve as a useful guideline for the design of organic nonlinear optical containing 1, 3-heterocycles with large first hyperpolarizabilities.
Sivanesan Dharmalingam,구은회,윤성호,Gyoosoon Park 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.3
A Cu(II) complex with an three nitrogens and one sulfur coordination environment was synthesized and characterized. Its redox potential was observed at 0.483 V vs. NHE, very similar to that of a Cu-containing fungal enzyme, galactose oxidase, which catalyzes the oxidation of alcohols to corresponding aldehydes with the concomitant reduction of molecular oxygen to water. The Cu(II) complex selectively oxidizes the benzylic alcohols using TEMPO/O2 under mild reaction conditions to corresponding aldehydes without forming any over-oxidation product. Moreover, the catalyst can be recovered and reused multiple times for further oxidation reactions, thus minimizing the waste generation.
ACE 억제제 연구 : Cilizapril 합성 Synthesis of Cilazapril
강흥모,임재성,박규순 국민대학교 2002 기초과학연구소 논문집 Vol.21 No.-
ACE inhibitor, cilazapril의 합성에서 중간물질 (S)-hexahydro-1,3-pyridazinedicarboxylic acid 1-benzyl-3-tert-butylester와(S)-4-[(benzyloxy)carbonyl]-2-phthal imidobutanoic acid를 아미노산인 L-glutamic acid로부터 다단계 화학반응을 통해 합성하였다. Synthetic studies on ACE inhibitor, cilazapril, has been investigated. Intermediate (S)-hexahydro-1,3-pyridazinedicarboxylic acid 1-benzyl-3-tert-butylester was synthesized from L-glutamic acid via 11 steps. The intermediate (S)-4-[(benzyloxy)carbonyl]-2-phthalimido-butanoic acid was obtaibed from L-glutamic acid.
Kim, Jin Won,Cho, Dae Won,Park, Gyoosoon,Kim, Sung Hong,Ra, Choon Sup Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.8
Ring opening reactions of epoxides with oxygen nucleophiles catalyzed by a variety of quaternary onium salt, such as ammonium or phosphonium salt were explored. The results showed that tetrabutylphosphonium bromide (TBPB) among salts serves as the most efficient catalyst for this process and that expoxide ring opening reactions with a variety of oxygen nucleophiles including carboxyic acid and phenol, promoted using this salt, lead to generate readily purifiable products in excellent yields.
Dharmalingam, Sivanesan,Koo, Eunhae,Yoon, Sungho,Park, Gyoosoon Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.3
A Cu(II) complex with an three nitrogens and one sulfur coordination environment was synthesized and characterized. Its redox potential was observed at 0.483 V vs. NHE, very similar to that of a Cu-containing fungal enzyme, galactose oxidase, which catalyzes the oxidation of alcohols to corresponding aldehydes with the concomitant reduction of molecular oxygen to water. The Cu(II) complex selectively oxidizes the benzylic alcohols using TEMPO/$O_2$ under mild reaction conditions to corresponding aldehydes without forming any over-oxidation product. Moreover, the catalyst can be recovered and reused multiple times for further oxidation reactions, thus minimizing the waste generation.