Read e-book online Anomeric Effect. Origin and Consequences PDF

By Walter A. & Derek Horton (eds.) Szarek

ISBN-10: 0841204705

ISBN-13: 9780841204706

ISBN-10: 0841205973

ISBN-13: 9780841205970

content material: The interplay among the ring-oxygen p-type lone pair and adjoining [sigma]-bonds in pyranose derivatives / Serge David --
The exo-anomeric influence / R.U. Lemieux, S. Koto, and D. Voisin --
Proton spin-lattice leisure : a brand new, quantitative degree of aglycon-sugar interactions / J.M. Berry, L.D. corridor, D.G. Welder, and K.F. Wong --
The structural homes of the anomeric middle in pyranoses and pyranosides / G.A. Jeffrey --
elements of conformational research of pentopyranosyl acetates, benzoates, and halides / Hans Paulsen, Peter Luger, and Fred R. Heiker --
The impact of reactant constitution and solvent on glycoside synthesis / Conrad Schuerch --
Conformational interactions in 1,4-heterobutane segments / Ernest L. Eliel and Eusebio Juaristi.

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And Shatkina, T. , Tetrahedron, (1962) 18, 237. 11. Tardella, P. , Tetrahedron Letters, (1969) 14, 1117. 12. House, H. , Czuba, L. , and Olmstead, H. , J. Org. , (1969) 34, 2324. 13. Eliel, E. , Martin, R. J. , Org. , (1967) 47, 16. 14. Johnson, W. S. , J. Am. Chem. , (1947) 69, 1361. 15. , Bull. Soc. , France, (1950) 17, 631. 16. , Progr. Nucl. Magn. , (1969) 5, 149. 17. Lemieux, R. , Bundle, D. , and Baker, D. , J. Am. Chem. , (1975) 97, 4076 18. Painter, T. , J. Chem. , Perkin Trans. II, (1976) 215.

Not s u r p r i s i n g l y , t h e r e i s e x c e l l e n t a g r e e m e n t between t h e v a l u e s c a l c u l a t e d from the n o n - s e l e c t i v e and s i n g l e - s e l e c t i v e r e l a x a t i o n rates. Because o f t h e poor d i s p e r s i o n o f the p r o t o n s p e c t r a o f t h e methyl D - g l u c o p y r a n o s i d e s i n aqueous s o l u t i o n t h e above d e u t e r a t i o n experiment o n l y i d e n t i f i e d the methoxyl r e l a x a t i o n con­ t r i b u t i o n i n t o t h e H-l r e s o n a n c e .

Ch003 [ ft on • S t U c U v t , two -puUc uyunc* Partial 100-MHz *H NMR spectra of methyl p-D-glucopyranoside, showing a two-pulse nonselective inversion-recovery determination of the spinlattice relaxation rates. 5 sec. The time interval (sec) between the 180°- and 190°-pulses are indicated to the right of the respective spectra. Figure 2. 3. BERRY E T A L . 0 Figure 3. Partial 100-MHz H NMR spectra of methyl (3-D-glucopyranoside, showing the single selective determination of the spin-lattice relaxation rate of H-l using a two-pulse inversion-recovery sequence.

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Anomeric Effect. Origin and Consequences by Walter A. & Derek Horton (eds.) Szarek

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