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[R3Si-arene]+ σ Complexes in the Gas Phase

✍ Scribed by Prof. Fulvio Cacace; Prof. Marina Attinà; Prof. Simonetta Fornarini

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
272 KB
Volume
34
Category
Article
ISSN
0044-8249

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✦ Synopsis

Fig. 3. 100 MHz 13C NMR difference spectrum of unlabeled urocanase (afterbefore) addition of 2 pmol of (5'-'3C)imidazolepropionic acid. The broad signal at 6 = 87.5 arises from the NAD' -(5'-13C)imidazolepropionate adduct; the sharp signal at 6 = 117 corresponds to free (5'-'3C)imidazolepropionic aad. Approximately 150 mg (1.22 pmol) of urocanase in 2 mL of 50 mM K,HPO, buffer, pH 7.5. H,O/D,O 8:1,10 mm NMR tube, 'H-broadband decoupled, NOE unsuppressed, line broadening = 10 Hz, T = 297 K, 52000 scans. zole ring. Evidence for an equilibrium between 4 a and 4 is provided by the previously observed urocanase-catalyzed exchange of the H-5 atom of imidazole propionate with solvent protons.16, '3 "1

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