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RISS 인기검색어
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- 저자 : 박승언 ( Seung Un Park ) (검색결과 8 건)
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2-Aminothiazole 유도체의 합성에 관한 연구
박승언 ( Seung Un Park ) 건국대학교 기초과학연구소 1989 理學論集 Vol.14 No.-
A new aminothiazole derivative, 2-amino-4-methoxylmmoethyl-5-carbomethoxythiazole, was synthesized in 4 steps from 2,3-butanedione monoxime as a starting material in ca. 20% overall yield. In this multi-step synthesis the structures of intermediates were identified using H-NMR spectroscopy, and some details of reactions were also discussed.
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2', 3'-Diazaterphenyl-4-carboxylate 액정의 합성
박승언,정화식 建國大學校基礎科學硏究所 1999 理學論集 Vol.24 No.-
4"-((S)-2-methylbutyl)-2',3' -diaza-1,1': 4'1"-terphenyl-4-carboxylate ester 유도체 화합물 CnH₂n+₁,n=6-12을 bromobenzene과 (S)-2-methylbutanol로부터 11 단계의 합성과정을 거쳐 26%의 수율로 합성하고, DSC 및 편광현미경을 이용하여 상전이를 조사한 결과 이들은 Smectic A(SА)상을 지니는 액정 화합물임을 확인하였다. 4"-((S)-2-methylbutyl)-2',3' -diaza-1,1': 4'1"-terphenyl-4-carboxylate ester (CnH₂n+₁,n=6-12) derivatives were synthesized via 11 steps from bromobenzene and (S)-2-methylbutanol in 26% overall yield. DSC measurements and polarizing microscopic observations of these compounds show that they have the Smectic A(SА) phases.
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박승언,이재승 건국대학교 기초과학연구소 2000 理學論集 Vol.25 No.-
3-p-아실옥시페닐-6-(p-((S)-2-메틸부틸)페닐피리다진 유도체들(CnH2n+1COO, n=6-11)을 합성하였다. 이들 화합물을 DSC 및 편광현미경을 이용하여 상전이를 조사한 결과 이들은 Smectic C*(Sc*) 상을 지니는 액정 화합물인 것을 확인하였다. 이 화합물을 합성하기 위하여 p-((S)-2-methylbutyl)phenacyl chloride(□)와 β-keto seter(□)를 각각 (S)-2-methylbutanol로부터 3단계, 그리고 페놀로부터 4단계 과정을 거쳐 얻었고, 화합물(□)와 화합물(□)로부터 5단계의 합성과정을 거쳐 최종 목표 화합물을 얻을 수 있었다. 3-p-acyloxyphenyl-6(p-((S)-2-methybutyl)phenyl)pyridazine derivatives (CnH2+1COO, n=6-11) were synthesized. These compounds showed smectic C*(Sc*) mesophases by the DSC measurements and the polarizing microscopic observation. In this synthesis p-((S)-2-methylbutyl)phenacyl chloride(□) and β-keto seter(□) were synthesized from (S)-2-methylbutanol in 3 steps, and from phenol in 4 steps, respectively. The target compounds were synthesized from the compound(□) and (□) in 5 steps.
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4-Pentenyl 라디칼의 전구물질 합성에 관한 연구
박승언 건국대학교 1990 學術誌 Vol.34 No.2
2,2-Dimethyl-1,3-propanediol을 출발물질로 하여 6단계의 반응을 거쳐서 4-Pentenyl 라디칼의 전구물질인 5-cyano-2,2-dimethyl-4-pentenyl bromide를 함성하였다. 또한 각 단계의 반응 생성물의 구조를 핵자기공명 분광법과 GC-MS를 이용하여 확인하였다. 5-Cyano-2,2-dimethyl-4-pentenyl bromide as a radical precursor was synthesized via six stems from 2,2-dimethyl-1,3-propanediol. The identifications of reaction products were also performed using H-NMR spectroscopic and GC-MS techniques.
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박영수,박승언 建國大學校基礎科學硏究所 1991 理學論集 Vol.16 No.-
Pyridazine 액정을 합성하기 위한 예비실험으로서 toluene과 phenol로부터 9단계의 짧은 반응과정을 거쳐서 3-(4-methylphenyl)-6-(4-methoxyphenyl)pyridazine을 12%의 수율로 합성하였다. 이 합성과정의 중요한 단계는 2-bromo-4'-methoxyacetophenone과 methyl 4-met-hylbenzoylacetate의 coupling 반응이다. 또한 여러가지 중간체 합성반응에 대하여 검토하였다. 3-(4-Methylphenyl)-6-(4-methoxyphenyl)pyridazine as a model of pyridazine type liquid crystal was conveniently synthesized in 12% yield via 9 steps from toluene and phenol. The key step of this synthetic pathway was a C-C coupling reaction of 2-bromo-4'-alkoxyacetophenone with methyl 4-alkylbenzoylacetate. The reaction conditions for the preparation of the key intermediates were also discussed.
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Synthesis of 2-Aminothiazole derivatives
Park,Seung Un 建國大學校基礎科學硏究所 1989 理學論集 Vol.14 No.-
새로운 Aminothiazole 유도체인 2-amino-4-methoxyiminoethyl-5-carbomethoxythiazole을 2, 3-butanedione monoxime을 출발물질로 하여 4단계의 합성과정을 거쳐서 출발물질로부터 약 20%의 수율로 합성하였다. 중간 생성물들의 구조는 핵자기 공명 분광법을 이용하여 확인하였으며, 또 각각의 반응에 대하여 검토하였다. A new aminothiazole derivative, 2-amino-4-methoxyiminoethyl-5-carbomethoxythiazole, was synthesized in 4 steps from 2, 3-butanedione monoxime as a starting material in ca. 20% overall yield. In this multi-step synthesis the structures of intermediates were identified using H-NMR spectroscopy, and some details of reactions were also discussed.
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박승언,이찬재 建國大學校基礎科學硏究所 1993 理學論集 Vol.18 No.-
Pyrimidine계 액정 화학물 합성 과정의 중요한 전구물질인 1-dimethylamino-3-dimethylimino-2-(4-hydroxyphenyl)propene perchlorate와 4-((S)-2-methylbutyl)Phenylamidine hydrochloride를 합성하였다. Amidinium염은 4-((S)-2-methylbutyl)acetophenone으로부터 합성하였다. Amidine염과 perchlorate염의 반응에서 얻은 pyrimidine 유도체는 편광현미경과 DSC를 이용하여 분석한 결과 강유전성을 지니는 액정 화합물임을 알 수 있었다. The two synthetic intermediates for the preparation of pyrimidine type liquid crystals, 1-dimethylamino-3-dimethylimino-2-(4-hydroxyphenyl)propene perchlorate and 4-((S)-2-methylbutyl)phenylamidine hydrochloride, were synthesized. 1-Dimethylamino-3-dimethylimino-2-(4-hydroxyphenyl)propene perchlorate was prepared from the Vilsmeier reaction of 4-hydroxypheylacetic acid, and 4-((S)-2-methylbutyl)phenylamidine hydrochloride was prepared via 4 steps from 4-((S)-2-methylbutyl)acetophenone, respectively. The pyrimidine derivatives prepared from the amidine salt and perchlorate salt showed ferrolelectric mesophases by the DSC and polarized microscopic analysis.
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