کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1307795 975154 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The epimerization of chiral half sandwich 2-phenylpyridine-based ruthenacycle
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
The epimerization of chiral half sandwich 2-phenylpyridine-based ruthenacycle
چکیده انگلیسی

The reaction of a chiral terpenic 2-phenylpyridine with mercury (II) acetate afforded a new ortho-chloromercurated substrate, which was treated with [(η6-cymene)RuCl2]2 to afford two diastereomers of the corresponding half-sandwich cyclochlororuthenated terpenic ligand. The latter two complexes were successfully separated by conventional chromatography and their configurational stability investigated by 1H NMR and CD spectroscopy. It was found that both isolated diastereomers displayed a fair configurational stability in CH2Cl2 while when dissolved in MeOH they epimerize. It was shown that the rate of epimerization is rather slow in pure MeOH, whereas in the presence of an excess of Lewis acid such as HgCl2 it was notably accelerated suggesting that the decoordination of the chloride from the Ru(II) center is a key step in the epimerization process.

Two isolated diastereomers of a cycloruthenated terpenic 2-phenylpyridine displayed a fair configurational stability in CH2Cl2 whereas in MeOH they epimerize.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Inorganica Chimica Acta - Volume 359, Issue 6, 10 April 2006, Pages 1754–1760
نویسندگان
, , , ,