کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5226061 | 1383565 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Polyborylation of azulenes
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In the presence of an active Ir-based catalyst, azulene underwent stepwise borylation with bis(pinacolato)diboron to produce polyborylated products. The reactivity of the ring atoms toward borylation was found to decrease in the following order: 2-position>1,3-positions>6-position>5,7-positions. Extension of the borylation to some azulenes substituted at the five-membered ring was also examined. Furthermore, the reaction of 2,6-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolanyl)azulene (3a) with an equivalent of hydrogen peroxide revealed that the oxidation proceeds preferentially at the 6-position. This indicates that the reactivity of the boryl group is governed by the Ï-polarization of the azulenyl skeleton.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tetrahedron - Volume 65, Issue 34, 22 August 2009, Pages 7115-7121
Journal: Tetrahedron - Volume 65, Issue 34, 22 August 2009, Pages 7115-7121
نویسندگان
Masayuki Fujinaga, Toshihiro Murafuji, Kei Kurotobi, Yoshikazu Sugihara,