Heteropoly acid catalysis for the isomerization of biomass-derived limonene oxide and kinetic separation of the trans-isomer in green solvents
作者:Rafaela F. Cotta、Rafael A. Martins、Matheus M. Pereira、Kelly A. da Silva Rocha、Elena F. Kozhevnikova、Ivan V. Kozhevnikov、Elena V. Gusevskaya
DOI:10.1016/j.apcata.2019.117173
日期:2019.8
an abundant class of natural products, which is important for flavor and fragrance industry. Many acid catalyzed reactions used for upgrading terpenes still involve mineral acids as homogeneous catalysts and/or toxic solvents. Heteropolyacids represent a well-established eco-friendly alternative to conventional acidcatalysts. As these reactions are usually performed in the liquid phase, solvents play
Heteropoly acid catalysts for the synthesis of fragrance compounds from biorenewables: isomerization of limonene oxide
作者:Vinícius V. Costa、Kelly A. da Silva Rocha、Ivan V. Kozhevnikov、Elena F. Kozhevnikova、Elena V. Gusevskaya
DOI:10.1039/c2cy20526b
日期:——
isomerization of limonene oxide was studied in the presence of heteropolyacidcatalysts in aprotic solvents in homogeneous and heterogeneous systems. Among the catalysts were bulk and silica-supported tungstophosphoric acid H3PW12O40 and its acidic Cs salt Cs0.5H0.5PW12O40 (CsPW). The reaction gave dihydrocarvone, a valuable fragrance intermediate, as the main product with turnover numbers of up to
液相异构化 氧化烯在均相和非均相系统中,在质子惰性溶剂中存在杂多酸催化剂的条件下,进行了研究。在催化剂中有本体和负载二氧化硅的钨磷酸H 3 PW 12 O 40及其酸性Cs盐Cs 0.5 H 0.5 PW 12 O 40(CsPW)。反应产生二氢香芹酮,一种有价值的香料中间体,作为主要产品,营业额高达8000。溶剂的性质对反应速率和选择性有很强的影响。发现CsPW(0.1 mol%)是该反应的高效且真正多相的催化剂,可提供82%的CsPW二氢香芹酮 在 1,4-二恶烷在环境条件下用作溶剂。这种简单的催化方法代表了从容易从香精油获得的生物可再生底物开始,向工业上重要的化合物发展的经济诱人途径。
Acidity and Catalytic Activity of Iron(II) Sulfate Heat-treated at High Temperature
作者:Kazushi Arata、Makoto Hino
DOI:10.1246/bcsj.53.535
日期:1980.2
Acidity and catalytic activity of FeSO4 calcined at 500–900 °C were studied. The product obtained by calcination at 700 °C showed maximum acidity at H0≤1.5 and activity for isomerization of d-limonene oxide, polymerization of isobutyl vinyl ether and dehydration of 2-propanol. When calcined at 750 °C the product showed no acidity or activity.
研究了在 500–900 °C 下煅烧的 FeSO4 的酸度和催化活性。 700℃煅烧所得产物在H0≤1.5时显示最大酸性,并具有d-柠檬烯氧化物异构化、异丁基乙烯基醚聚合和2-丙醇脱水活性。当在 750 °C 下煅烧时,该产品没有表现出酸性或活性。
Volcho; Tatarova; Korchagina, Russian Journal of Organic Chemistry, 2000, vol. 36, # 1, p. 32 - 39