Nuclear magnetic resonance studies of tertiary phosphine hydrobromides

1968 ◽  
Vol 46 (12) ◽  
pp. 2071-2074 ◽  
Author(s):  
Samuel O. Grim ◽  
William McFarlane
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Chemical Shifts ◽  
Group Contributions ◽  
Tertiary Phosphine ◽  
Magnetic Resonance Studies ◽  
Magnetic Resonance Data ◽  
Tertiary Phosphines ◽  
Resonance Data ◽  
Proton Magnetic Resonance Data

Phosphorus and proton magnetic resonance data are presented for hydrobromides of 15 tertiary phosphines, of which 5 are trialkylphosphines, 5 are dialkylphenylphosphines, and 5 are diphenylalkylphosphines. The 31P chemical shifts of each of these series of phosphonium compounds are linearly related to the sum of the group contributions (g.c.) of the organic groups on the respective phosphines.

Proton magnetic resonance studies of 2′-deoxynucleosides and nucleotides in the syn conformation

1978 ◽  
Vol 56 (9) ◽  
pp. 1170-1176 ◽  
Author(s):  
Arthur L. George ◽  
Frank E. Hruska ◽  
Kelvin K. Ogilvie ◽  
Antonin Holy
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Repulsive Interaction ◽  
Nucleotide Level ◽  
Magnetic Resonance Studies ◽  
Magnetic Resonance Data ◽  
Resonance Data ◽  
Sugar Ring ◽  
Derivatives Of ◽  
Proton Magnetic Resonance Data

Proton magnetic resonance data for 6-methyl-2′-deoxyuridine and its 3′- and 5′-monophosphate derivatives are obtained in aqueous solution and compared with data for corresponding thymine derivatives. The data show that the derivatives of the 6-methyluracil base occupy the syn conformation. The presence of the syn base leads to a flattening of the sugar ring and destabilization of the g+ conformer about the C(4′)—C(5′) bond. This destabilization is particularly large at the 5′-nucleotide level and is discussed in terms of a repulsive interaction involving the 2-keto oxygen of the base and the negatively charged 5′-group.

Cycloaddition d'ylures d'azométhine dérivés de la 3,4-dihydro-6,7-diméthoxy-3-méthoxycarbonyl-isoquinoléine

1991 ◽  
Vol 69 (7) ◽  
pp. 1156-1160 ◽  
Author(s):  
Tahar Lakhlifi ◽  
Ahmed Sedqui ◽  
Bernard Laude ◽  
Nguyen Dinh An ◽  
Joël Vebrel
Keyword(s):  
Magnetic Resonance ◽  
Key Words ◽  
Proton Magnetic Resonance ◽  
Azomethine Ylide ◽  
Magnetic Resonance Data ◽  
Resonance Data ◽  
Azabicyclic Compounds ◽  
Derivatives Of ◽  
Proton Magnetic Resonance Data

Three azomethine ylide precursors including the methyl 3,4-dihydro-6,7-dimethoxyisoquinoline-3carboxylate moiety were synthesized. The 1,3-dipolar species formed from these products react with activated dipolarophilic olefines leading diastereospecifically to derivatives of 4′,5′-dimethoxy-1,2-benzo-4,7-imino-4-methoxycarbonyl-1-cycloheptene. Proton magnetic resonance data allowed the determination of the stereochemistry of the cycloadducts. Key words: cyclic azomethine ylide, azabicyclic compounds, stereochemistry.

A Comparative Proton Magnetic Resonance Study of the Molecular Conformation of Uracil and 6-Aza Uracil Nucleosides and Nucleotides

1973 ◽  
Vol 51 (15) ◽  
pp. 2571-2577 ◽  
Author(s):  
Donald J. Wood ◽  
Frank E. Hruska ◽  
Richard J. Mynott ◽  
Ramaswamy H. Sarma
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Molecular Conformation ◽  
Three Dimensional ◽  
Magnetic Resonance Study ◽  
Magnetic Resonance Data ◽  
Ribose Phosphate ◽  
Resonance Data ◽  
Proton Magnetic Resonance Study ◽  
Proton Magnetic Resonance Data

Proton magnetic resonance data for uridine and uridine-5′-monophosphate, and the corresponding 6-azauracil analogs, are presented and discussed in terms of their overall three dimensional conformations in aqueous solution. The data reveal a destabilizing influence of the 6-aza base upon the gog and g′–g′ conformation of the ribose phosphate moiety.

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