C-13 AND N-15 CROSS-POLARIZATION MAGIC-ANGLE-SPINNING NMR-SPECTRA OF N-15-ENRICHED 2-PHENETHYLAMINE ABSORBED ON AN ACTIVATED CLAY

The cross-polarization magic angle spinning (CPMAS) C-13 NMR spectra o f N-15-enriched 2-phenethylamine as the ammonium salt and adsorbed on an aluminum-exchanged clay are compared with spectra for natural abund ance 2-phenethylamine. An important gain in resolution is observed in the beta carbon chemical shift region of the C-13 CPMAS of the N-15-en riched material relative to either the natural abundance material or t he C-13-enriched amine. The CPMAS N-15 NMR spectra of N-15-enriched 2- phenethylamine adsorbed on the aluminum-exchanged clay reveal the pres ence of multiple Bronsted sites for adsorption.