NMR study of spirophosphoranes derived from 2-aminophenols

✍ Scribed by Julio Hernández-Díaz; Rosalinda Contreras; Bernd Wrackmeyer

• Book ID: 101260769
• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 181 KB
• Volume: 11
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/(sici)1098-1071(2000)11:1<11::aid-hc3>3.0.co;2-n

✦ Synopsis

Multinuclear magnetic resonance experiments were performed ( 1 H, 13 C, 31 P, and 15 N) for P-H phosphoranes derived from 2-aminophenol, 4tert-butyl-2-aminophenol, and 4,6-di-tert-butyl-2-aminophenol. Selective heteronuclear 1 H{ 15 N} double resonance experiments and two-dimensional 15 N/ 1 H HETCOR experiments enabled us to determine various signs of coupling constants (e.g., 2 J( 31 P, N, 1 H) Ͼ 0; 1 J( 31 P, 15 N) Ͻ 0). The 1 H-coupled 15 N NMR spectrum recorded by the INEPT pulse sequence shows the splitting due to 1 J( 31 P, 15 N) and 2 J( 15 N, P, 1 H). The latter value is useful for polarization transfer experiments from 1 H to 15 N, once the hydrogen atoms of the N-H functions are replaced by other groups. Isotope-induced chemical shifts 1 D 14/15 N( 31 P) were measured by using the INEPT-HEED pulse sequence.