ChemInform Abstract: CYCLIC PEPTIDES. 15. LANTHANIDE-ASSISTED CARBON-13 AND PROTON NMR ANALYSIS OF F PREFERRED SIDE-CHAIN ROTAMERS IN PROLINE-CONTAINING CYCLIC DIPEPTIDES

1976 ◽  
Vol 7 (46) ◽  
pp. no-no
Author(s):  
P. E. YOUNG ◽  
V. MADISON ◽  
E. R. BLOUT
1994 ◽  
Vol 35 (11) ◽  
pp. 1925-1931
Author(s):  
R K Adosraku ◽  
G T Choi ◽  
V Constantinou-Kokotos ◽  
M M Anderson ◽  
W A Gibbons

1978 ◽  
Vol 56 (6) ◽  
pp. 789-793 ◽  
Author(s):  
Donald C. Wigfield ◽  
Steve Feiner

The stereoisomers of 2-methyltetrahydropyran-4-ol have been separated and identified by carbon-13 and proton nmr analysis of the trideuteriomethyl-2,6,6-trideuterio analogue. Stereoisomeric product ratios of reduction of 2-methyltetrahydropyran-4-one (1) by NaBH4, KBH4, L-Selectride, K-Selectride, and LiBH(nBu)3 have been determined and compared with reductions of 3-methylcyclohexanone. Product ratios in the reduction of the two substrates by the borohydride reducing agents are similar but are quite different in the reduction by the Selectride reducing agents, 1 being reduced by Selectride to give 73% equatorialalcohol. Two possible mechanisms of reduction of 1 are proposed, involving intramolecular assistance by the cyclic ether oxygen.


2006 ◽  
Vol 12 (6) ◽  
pp. 705-710 ◽  
Author(s):  
Heide L Kirschenlohr ◽  
Julian L Griffin ◽  
Sarah C Clarke ◽  
Ranyl Rhydwen ◽  
Andrew A Grace ◽  
...  

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