Two macrocyclic polyether isomers were obtained by radical cyclization of (E)-8-iodo-3,6-dioxaoctyl-3ethoxycarbonylpropenoate and separated by liquid-solid chromatography over silica gel. They were characterized, for the Ðrst time, by two-dimensional NMR ; notably, the HMBC experiment gave access to
Structure and Conformational Exchange of PtCl2[Bis(undecenylseleno)ferrocene] Studied by NMR Spectroscopy
✍ Scribed by Xi-An Mao; Jun-Zhi Yao; Bing-Shou Tian; Yuan-Yin Chen
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 483 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
One-and two-dimensional NMR techniques were applied to the study of the structure and the intramolecular exchange dynamics of the newly synthesized complex cis-PtCI, 1 ,l'-bis(undeceny1seleno)ferrocenel in CDCl, solution. COSY, HMQC and NOESY experiments were performed. Unambiguous assignments for the cyclopentadienyl ring protons were achieved and the dl-meso exchange rate constants were determined.
KEY WORDS platinum(I1) complex; intramolecular dl-meso exchange; rate constants
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