Further 13C nuclear magnetic resonance studies of glycals (1,5-anhydro-hex-1-enitols)

1980 ◽  
Vol 33 (5) ◽  
pp. 1037 ◽  
Author(s):  
RD Guthrie ◽  
RW Irvine
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Factors Affecting ◽  
Magnetic Resonance Studies ◽  
13C Nuclear Magnetic Resonance ◽  
Derivatives Of ◽  
Nuclear Magnetic

Study of 24 derivatives of D-glucal and D-allal have been used as models to test the findings of Fliszar et al. with respect to factors affecting the 13C n.m.r. shifts for saturated and unsaturated carbon atoms.

13C Nuclear Magnetic Resonance Studies of Organometallic Compounds. IV. cis-Dimethylplatinum(II) Derivatives

1974 ◽  
Vol 52 (7) ◽  
pp. 1165-1170 ◽  
Author(s):  
Howard Charles Clark ◽  
Leo Ernest Manzer ◽  
John Edward Henry Ward
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Organometallic Compounds ◽  
Methyl Groups ◽  
Magnetic Resonance Studies ◽  
Trans Influence ◽  
13C Nuclear Magnetic Resonance ◽  
Cis And Trans ◽  
Derivatives Of ◽  
Nuclear Magnetic

Data derived from the 13C n.m.r. spectra of seven neutral cis-dimethylplatinum(II) derivatives of the type cis-(CH3)2PtL2 and cis-(CH3)2Pt(L—L) (where L and L—L are neutral donors) are discussed and compared with data derived from the 1H n.m.r. spectra of the complexes. Simultaneous variations in L or L—L reveal that the n.m.r. trans-influence rather than the n.m.r. cis-influence is dominant. The suggestion that the n.m.r. cis- and trans-influences may be additive is discussed. In contrast with data obtained by other workers, it is shown that the 1JCH values of the platinum methyl groups are essentially insensitive to variations in the remaining ligands.

13C Nuclear Magnetic Resonance Studies. Part 48. 13C Spectra of a Variety of Bicyclic Ketones

1975 ◽  
Vol 53 (9) ◽  
pp. 1351-1361 ◽  
Author(s):  
S. H. Grover ◽  
D. H. Marr ◽  
J. B. Stothers ◽  
C. T. Tan
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Important Influence ◽  
Magnetic Resonance Studies ◽  
Methyl Substitution ◽  
13C Nuclear Magnetic Resonance ◽  
Bicyclic Ketones ◽  
Methyl Derivatives ◽  
Derivatives Of ◽  
Nuclear Magnetic

The 13C n.m.r. spectra of a series of 37 bicyclic ketones have been recorded to examine the variations in 13C shieldings with structure and with methyl substitution. Several examples of six skeletal types were included: bicyclo[4.4.0]decanones, bicyclo[4.1.0]heptanones, bicyclo-[3.1.0]hexanones, bicyclo[3.2.2]nonanones, bicyclo[3.2.1]- and -[3.3.0]octanones as well as bicyclo[2.1.1]hexan-2-one, nopinone (6,6-dimethylbicyclo[3.1.1]heptan-2-one), and two methyl derivatives of the latter. The observed trends associated with methyl substitution follow well-defined patterns and offer further support for the application of 13C shieldings as aids for stereochemical assignments especially through the well known γ effects. The variation in the shieldings of the carbonyl carbons in these systems suggested that bond eclipsing interactions have an important influence on this parameter. With this notion, the heretofore puzzling variations observed for the cycloalkanones are readily interprétable in terms of their favored conformations.

13C Nuclear Magnetic Resonance Studies of Organometallic Compounds. III. cis-Methylplatinum(II) Derivatives

1974 ◽  
Vol 52 (4) ◽  
pp. 570-578 ◽  
Author(s):  
H. C. Clark ◽  
J. E. H. Ward
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Organometallic Compounds ◽  
Neutral Ligand ◽  
Magnetic Resonance Studies ◽  
13C Nuclear Magnetic Resonance ◽  
Related Series ◽  
Cis And Trans ◽  
Derivatives Of ◽  
Nuclear Magnetic

Eight new cis-methylplatinum(II) derivatives of the type DIARSPt(CH3)X (DIARS abbreviates o-phenylenebis(dimethylarsine), where X is an anionic substituent, and [DIARSPt(CH3)L]+PF6−, where L is a neutral ligand, have been prepared. Data derived from the 13C n.m.r. spectra of these complexes are discussed and compared with data derived from the 1H n.m.r. spectra of the complexes. Comparisons with the 13C n.m.r. parameters obtained from related series of trans-methylplatinum(II) derivatives reveal marked differences between the n.m.r. cis- and trans-influences. It appears that the n.m.r. cis-influence may in part be related to a ligand's "steric bulk".

X-Ray crystallographic and 13C nuclear magnetic resonance studies of 3,4,5,6-tetrahydro-2H-1,3,4-oxadiazin-2-ones derived from ephedrine and pseudoephedrine

Tetrahedron ◽  
2001 ◽  
Vol 57 (49) ◽  
pp. 9789-9798 ◽  
Author(s):  
Shawn R Hitchcock ◽  
George P Nora ◽  
David M Casper ◽  
Michael D Squire ◽  
Christopher D Maroules ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Studies ◽  
X Ray ◽  
13C Nuclear Magnetic Resonance ◽  
Nuclear Magnetic
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