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Probing the Structure and Crystallinity of a Lithium Silicate Glass by 29Si Magic-Angle-Spinning NMR Spectroscopy

✍ Scribed by Prof. Dr. C. N. R. Rao; Prof. Dr. John M. Thomas; Dr. Jacek Klinowski; U. Selvaraj; Dr. K. J. Rao; Dr. G. Robert Millward; Dr. Subramaniam Ramdas

Publisher: John Wiley and Sons
Year: 1985
Tongue: English
Weight: 240 KB
Volume: 24
Category: Article
ISSN: 0044-8249
DOI: 10.1002/anie.198500611

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✦ Synopsis

cyanocyclopentadienyl moiety appear as two doublets and a singlet, respectively. These results, together with the mass and "C-NMR spectroscopic data('], suggest that 3 is a n azulenofulvene derivative"' with two tert-butylthio groups and two cyano groups.

A formation scheme involving 1) attack by the 2-position of 2 at the 5-position of 1 , 2) opening of the threemembered ring, 3) proton transfer, 4) disrotatory 1071-electrocyclic reaction, and finally 5 ) dehydrogenating aromatization is shown in Scheme 2I8l. Table I . Spectral data for 3 and 4. 1R (KBr) UV (CH2C12) 'H-NMR (CDCI,) [a] [cm ~ ' 1

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