• 제목/요약/키워드: solvent-free

검색결과 616건 처리시간 0.028초

Styryl-6-Methoxy-2-Naphthyl Ketone 유도체의 합성 및 특성 분석 (Synthesis, Characterization and Correlation Analysis in Styryl 6-Methoxy-2-Naphthyl Ketones)

  • Thirunarayanan, G.
    • 대한화학회지
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    • 제51권2호
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    • pp.115-124
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    • 2007

  • α, β-불포화 케톤 유도체를 실리카-황산 촉매 하에서 비용매 교차 알돌 응축 반응법을 이용하여 합성하였다. 합성 수율은 90% 이상이었으며, 사용된 촉매는 회수 가능하였다. 합성돤 화합물들의 물리화학적인 특성은 IR, NMR, Mass 등의 분광학적 분석 방법을 이용하여 결정하였다. 케톤 생성물에 미치는 치환기 효과는 측정된 분광 데이터와 Hammet 치환기 상수간의 상관관계로 표현되는 다중 상관계수 방정식에 의하여 잘 설명될 수 있었다.

  • https://doi.org/10.5012/jkcs.2007.51.2.115 인용 PDF KSCI KPUBS HTML

An Efficient and Green Approach for the Esterification of Aromatic Acids with Various Alcohols over H3PO4/TiO2-ZrO2

  • Kalbasi, Roozbeh Javad;Massah, Ahmad Reza;Barkhordari, Zeynab
    • Bulletin of the Korean Chemical Society
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    • 제31권8호
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    • pp.2361-2367
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    • 2010

  • $TiO_2-ZrO_2$ was prepared with surfactant through a sol-gel method. Catalysts containing 5 - 35% $H_3PO_4$ were prepared using these oxides. Subsequently the catalytic performance of prepared catalysts was determined for liquid phase esterification of aromatic acids. $H_3PO_4/TiO_2-ZrO_2$ has been used as catalyst to synthesize various novel esters by esterification of some aromatic acids with aliphatic alcohols (2-propanol, 1-butanol, iso butanol, 3-pentanol, 1-hexanol, heptanol, cyclo heptanol, octanol and decanol). Under optimized conditions, maximum yields and selectivity (100%) to the corresponding ester, was obtained by using 25 wt % $H_3PO_4/TiO_2-ZrO_2$ as catalyst. The Catalyst can be easily recycled after reaction and can be reused without any significant loss of activity/selectivity performance. No by-product formation, high yields, short reaction times, mild reaction conditions, operational simplicity with reusability of the catalyst are the salient features of the present synthetic protocol. The reaction was carried out under solvent-free condition.

  • https://doi.org/10.5012/bkcs.2010.31.8.2361 인용 PDF KSCI