کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1403071 1501777 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and spectroscopic analysis of substituted 2-aminothiazolines
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Synthesis and spectroscopic analysis of substituted 2-aminothiazolines
چکیده انگلیسی

2-Aminothiazolines can exist in two tautomeric species, amino and imino forms, which can theoretically exist as two stereoisomers. Several methods and techniques have been used to evaluate tautomeric process, but in this case 15N NMR spectroscopy was used due to tautomeric process involves two nitrogen atoms. In this paper, we present the synthesis and a HMBC 1H-15N study of four 2-substituted aminothiazolines. It was observed from HMBC contour plot correlation between five membered ring CH2 groups with sp2 nitrogen around 250 ppm, while aliphatic hydrogen correlates with sp3 nitrogen around 90 ppm, suggesting that amino form is the major or the unique tautomer present in solution. Theoretical calculations at the M06-2X/cc-pVDZ level were performed and indicated that amino tautomer is slightly more stable (∼1 kcal mol−1) than imino one.

Figure optionsDownload as PowerPoint slideHighlights
► Synthesis and spectrometric characterization of four new aminothiazolines.
► Study of the tautomerism phenomenon by 1H-15N HMBC.
► Theoretical calculation was performed and suggested that amino tautomer is around 1 kcal mol−1more stable than iminoform.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 1037, 10 April 2013, Pages 186–190
نویسندگان
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