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Mass spectral and NMR analysis

While complete ring closure is indicated by mass spectral and NMR analysis, characterization of 5 by X-ray and neutron scattering [133], and by dynamic light scattering experiments [134] suggested this polymer has... [Pg.36]

Fractions 93-135 were combined and evaporated to dryness to yield 3 2 mg. N te Bioassay of a titration of the composite (fractions 93-135) and of the feed indicated an 80% recovery of activity. HPLC analysis of the composite showed a single major component. Mass spectral and NMR analysis identified the sample as the known antibiotic rachelmycin shown in Fig. 24. [Pg.138]

The report states that after mixing 0.1 M chloroform solutions of both monomers in the presence of polyphosphoric acid, there is an immediate coloration, and after 4 hours, a dark intractable precipitate having a conductivity of 10 S cm , which increases to 10 Scm after treatment with concentrated H2SO4. If more dilute solutions are used and the reaction is stopped by removal of the polyphosphoric acid, a soluble intermediate is isolated. Mass spectral and NMR analysis indicate that this intermediate is either 2,5- or 2,6-bis(2-pyrrolyl)l,4-benzoquinone. If a... [Pg.497]

See other pages where Mass spectral and NMR analysis is mentioned: [Pg.232]   
See also in sourсe #XX -- [ Pg.232 , Pg.233 , Pg.234 , Pg.235 , Pg.236 , Pg.237 , Pg.238 , Pg.239 , Pg.240 , Pg.241 , Pg.242 ]



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Mass spectral

Mass spectral analysis

NMR SPECTRAL ANALYSIS

NMR analyses

Spectral analysis

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