کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9765842 | 1499371 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis, 17O NMR spectroscopy and structure of 2-trifluoroacetyl-1-methoxycycloalkenes
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی معدنی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Among the synthesis of a series of five well-known 2-trifluoroacetyl-1-methoxycycloalkenes derived from cyclopentanone and substituted cyclohexanones, this paper describes the synthesis of three new 2-trifluoroacetyl-1-methoxycycloalkenes derived from cycloheptanone, cyclooctanone and cyclododecanone in 60-68% yield. Subsequently, the 17O NMR chemical shift analysis of the carbonyl and the methoxy groups for these cyclic molecules clearly showed the electron push-pull phenomenon and revealed large and irregular variations of 17O NMR chemical shifts with the ring size. Finally, a more stable conformation of these trifluoroacetyl-containing cycloalkenes was determined by energy minimization calculations using Austin Model 1 (AM1) semi-empirical method and correlations between 17O NMR data and torsion angles or oxygen net charge calculated by AM1 semi-empirical method were performed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Fluorine Chemistry - Volume 126, Issues 9â10, October 2005, Pages 1396-1402
Journal: Journal of Fluorine Chemistry - Volume 126, Issues 9â10, October 2005, Pages 1396-1402
نویسندگان
Helio G. Bonacorso, Michelle B. Costa, Sidnei Moura, Lucas Pizzuti, Marcos A.P. Martins, Nilo Zanatta, Alex F.C. Flores,