THE PREPARATION OF 4,6-O-BENZYLIDENE-D-GLUCAL AND THE REACTION OF METHYLLITHIUM WITH METHYL 2,3-ANHYDRO-4,6-O-BENZYLIDENE-α-D-ALLOPYRANOSIDE

1966 ◽  
Vol 44 (23) ◽  
pp. 2825-2835 ◽  
Author(s):  
M. Sharma ◽  
R. K. Brown
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Unsaturated Compound ◽  
First Order ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

4,6-O-Benzylidene-D-glucal has been prepared by the reaction of benzaldehyde with D-glucal. The reaction of commercial methyllithium with methyl 2,3-anhydro-4,6-O-benzylidene-α-D-allopyranoside produces the C2-methylated 1,2-unsaturated compound 4,6-O-benzylidene-1,2-didehydro-1,2-dideoxy-2-methyl-D-ribo-hexopyranose. Their structures have been proven by first-order analyses of their nuclear magnetic resonance spectra.

The nuclear magnetic resonance spectra of the codeine isomers and their derivatives

1965 ◽  
Vol 18 (11) ◽  
pp. 1799 ◽  
Author(s):  
TJ Batterham ◽  
KH Bell ◽  
U Weiss
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Double Bond ◽  
Magnetic Resonance ◽  
Chemical Shift ◽  
Heterocyclic Ring ◽  
First Order ◽  
Nuclear Magnetic Resonance Spectra ◽  
First Order Methods ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The nuclear magnetic resonance spectra of codeine, isocodeine, pseudocodeine, allopseudocodeine, neopine, isoneopine, and some of their derivatives have been studied and the patterns produced by the protons on dl rings except the N-heterocyclic ring have been analysed by first-order methods. Allylic, homoallylic, and other long-range couplings have been observed. Differences in chemical shift between protons in different isomers have been explained in terms of the anisotropy of the double bond or the aromatic ring.

meso- and dl - .alpha.,.alpha.' -Bis(difluoramino)bibenzyls. Preparation and nuclear magnetic resonance spectra

1967 ◽  
Vol 32 (2) ◽  
pp. 466-468 ◽  
Author(s):  
Frederic Allan Johnson ◽  
Carolyn Haney ◽  
Travis Edward Stevens
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic
Sign in / Sign up

Export Citation Format

Share Document