A Cross-Polarization Magic-Angle Spinning 13C NMR Characterization of the Stable Solid-State Forms of Cimetidine

1997 ◽  
Vol 86 (12) ◽  
pp. 1400-1402 ◽  
Author(s):  
David A. Middleton ◽  
Cecile S. Le Duff ◽  
Frederic Berst ◽  
David G. Reid
Keyword(s):  
Solid State ◽  
13C Nmr ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Cross Polarization ◽  
Nmr Characterization ◽  
Angle Spinning

scholarly journals Facile Characterization of Polymer-Supported Reagents Using Cross Polarization Magic Angle Spinning Method in Solid State 13C-NMR

2004 ◽  
Vol 52 (7) ◽  
pp. 864-865
Author(s):  
Kazuaki Shikii ◽  
Hiroko Seki ◽  
Kentaro Yamaguchi ◽  
Wannaporn Disadee ◽  
Toshiko Watanabe ◽  
...  
Keyword(s):  
Solid State ◽  
13C Nmr ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Cross Polarization ◽  
Polymer Supported ◽  
Angle Spinning ◽  
Solid State 13C Nmr

Solid State NMR Characterization of Crosslinked Brominated Poly(Isobutylene-co-4-Methylstyrene)

1993 ◽  
Vol 66 (1) ◽  
pp. 109-120 ◽  
Author(s):  
R. R. Eckman ◽  
I. J. Gardner ◽  
H-C. Wang
Keyword(s):  
Solid State ◽  
Functional Groups ◽  
Solid State Nmr ◽  
Phenyl Ring ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Crosslinked Polymers ◽  
Nmr Characterization ◽  
Angle Spinning

Abstract The curing of brominated poly(isobutylene-co-4-methylstyrene) was studied using solid-state magic-angle-spinning NMR, a technique which is uniquely suited to investigate cured or crosslinked polymers. This brominated copolymer contains 4-bromomethylstyryl and 4-methylstyryl functional groups and was compression cured with pure ZnO. It was proposed that a precomplex is formed between zinc and the 4-bromomethylstyryl group, which generates a benzylic carbocationic intermediate. Crosslinking predominantly occurs by alkylation of the phenyl ring of another 4-bromomethylstyryl group by the benzylic intermediate. The ZnO brings the two bromides of these groups into proximity. The dependence of the cure chemistry on the concentration of 4-bromomethylstyryl functional groups was studied. Conversion of some 4-bromomethylstyryl groups to oxygenated species upon curing was also observed.

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