ChemInform Abstract: CARBON-13 NUCLEAR MAGNETIC RESONANCE OF N-HETEROCYCLES. PART 3. CARBON-13 CHEMICAL SHIFT ASSIGNMENTS OF THE CARBONYL GROUPS IN PENICILLINS AND CEPHALOSPORINS

1978 ◽  
Vol 9 (3) ◽  
Author(s):  
R. MONDELLI ◽  
P. VENTURA
1974 ◽  
Vol 96 (14) ◽  
pp. 4404-4410 ◽  
Author(s):  
Richard F. Sprecher ◽  
Brian E. Aufderheide ◽  
George W. Luther ◽  
James C. Carter

1974 ◽  
Vol 5 (39) ◽  
pp. no-no
Author(s):  
RICHARD F. SPRECHER ◽  
BRIAN E. AUFDERHEIDE ◽  
GEORGE W. III LUTHER ◽  
JAMES C. CARTER

2019 ◽  
Vol 14 (5) ◽  
pp. 1934578X1984361
Author(s):  
Milena G. Curcino Vieira ◽  
Raimundo Braz Filho ◽  
Ivo. J. Curcino Vieira

A novel limonoid named curcinomarcoide (1) was isolated from Trichilia hirta and characterized on the basis of its nuclear magnetic resonance and mass spectrometry spectral data and comparison with literature data.


1990 ◽  
Vol 68 (3) ◽  
pp. 371-374 ◽  
Author(s):  
Li Ya ◽  
George M. Strunz ◽  
Larry A. Calhoun

1-Desacetylwilfordine, 8, 1-desacetylwilfortrine, 9, and 2-debenzoyl-2-nicotinoylwilforine, 10, have been isolated from root extracts of the Chinese medicinal and insecticidal plant Tripterygiumwilfordii. Analysis of the 1H and 13C NMR spectra of 8 and 10, with the aid of COSY, HCCOSY, and COLOC experiments, has allowed unambiguous chemical shift assignments of all protons and carbons of these alkaloids. Keywords: alkaloids, sesquiterpene, Celastraceae, Tripterygium, NMR.


1976 ◽  
Vol 54 (23) ◽  
pp. 3766-3768 ◽  
Author(s):  
Dong Je Kim ◽  
Lawrence D. Colebrook ◽  
T. J. Adley

Previously reported 13C chemical shift assignments for C-15 and C-16 of a number of 17β-acetyl steroids related to progesterone have been shown to be reversed. Based on the revised assignment the effect of bromo- and hydroxy-substitution at C-17 on C-12, C-14, C-15, and C-16 is assessed.


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