کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5277066 | 1385572 | 2007 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The rotation of pentaphenylphenyl groups and their terminal phenyl groups: a variable-temperature 1H NMR study on an albatrossene and a three-bladed molecular propeller
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The rotation of pentaphenylphenyl groups and their terminal phenyl groups: a variable-temperature 1H NMR study on an albatrossene and a three-bladed molecular propeller The rotation of pentaphenylphenyl groups and their terminal phenyl groups: a variable-temperature 1H NMR study on an albatrossene and a three-bladed molecular propeller](/preview/png/5277066.png)
چکیده انگلیسی
Dynamic NMR of 1-phenylethynyl-3,5-bis(pentaphenylphenyl)benzene (1) and 1,3,5-tris(pentaphenylphenyl)benzene (2) allows us to determine two rotational barriers for each compound. For 1, a first process exhibits ÎGâ¡Â = 39.2 kJ/mol followed by a second one with a ÎGâ¡ value of 69.9 kJ/mol. Two processes with similar rotational barriers are found for 2 (70.9 and 75.3 kJ/mol). Motional processes which can be related to these barriers are 60° and 180° rotations of the pentaphenylphenyl units about the single bond with the core benzene ring and rotation of the terminal phenyl rings of the pentaphenylphenyl units. The results are discussed considering the consequences of these processes on the NMR spectra.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tetrahedron Letters - Volume 48, Issue 15, 9 April 2007, Pages 2655-2659
Journal: Tetrahedron Letters - Volume 48, Issue 15, 9 April 2007, Pages 2655-2659
نویسندگان
Hartmut Komber, Katrin Stumpe, Brigitte Voit,