کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
68428 48514 2006 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of 1,8-cineole and 1,4-cineole by isomerization of α-terpineol catalyzed by heteropoly acid
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Synthesis of 1,8-cineole and 1,4-cineole by isomerization of α-terpineol catalyzed by heteropoly acid
چکیده انگلیسی

The isomerization of α-terpineol (1) catalyzed by heteropoly acid H3PW12O40 (PW) in homogeneous and heterogeneous systems yields 1,8-cineole (2) and 1,4-cineole (3), both useful for flavoring and pharmaceutical applications. In the homogeneous system, 2 and 3 were obtained with 25% and 23–27% selectivity, respectively, at 50–90% α-terpineol conversion (in a nitrobenzene solution, 40 °C). In the heterogeneous system, 35% of 2 and 25% of 3 were obtained at 70–100% conversion in a cyclohexane solution at 60 °C using silica-supported PW as a solid acid catalyst, and the catalyst could be recycled. PW showed a higher catalytic activity and selectivity than conventional acid catalysts such as H2SO4 and Amberlyst-15.

The isomerization of α-terpineol (1) catalyzed by dissolved or silica-supported heteropoly acid H3PW12O40 (PW) yields 1,8-cineole (2) and 1,4-cineole (3), both useful for flavoring and pharmaceutical applications, with a 50–60% combined selectivity. PW showed a higher catalytic activity and selectivity than conventional acid catalysts such as H2SO4 and Amberlyst-15. Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 259, Issues 1–2, 15 November 2006, Pages 99–102
نویسندگان
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