Comparative study of ribonucleotides, deoxyribonucleotides, and hybrid oligonucleotide helixes by nuclear magnetic resonance

Biochemistry ◽  
1981 ◽  
Vol 20 (14) ◽  
pp. 3986-3996 ◽  
Author(s):  
Arthur Pardi ◽  
Francis H. Martin ◽  
Ignacio Tinoco
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Comparative Study ◽  
Nuclear Magnetic

Conformations of Bridged Diphenyls. V. A Nuclear Magnetic Resonance Comparative Study of the Conformations of Identically Substituted Diphenyl Ethers, Sulfides, Methanes, Ketones, Sulfoxides, and Sulfones

1974 ◽  
Vol 52 (4) ◽  
pp. 597-609 ◽  
Author(s):  
Harm Benjamins ◽  
W. David Chandler
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Comparative Study ◽  
Dihedral Angle ◽  
The Other ◽  
Central Plane ◽  
Ortho Hydrogen ◽  
Diphenyl Ethers ◽  
Nuclear Magnetic

Using n.m.r. methods developed in earlier papers, the conformations of two series, one doubly ortho-substituted and one triply ortho-substituted, of six identically substituted bridged diphenyls were compared. The ethers, sulfides, and methanes have been shown to adopt the same conformation in which the di-ortho-substituted ring is perpendicular to the central bridge plane while the other ring lies in that plane and an ortho hydrogen takes up the "inside" or "proximal" position. The benzophenones and sulfoxides prefer a conformation in which the dihedral angle between each ring and the central plane is about 40–50° and an ortho hydrogen adopts the "outside" or "distal" position. The sulfones adopt a conformation in which the two rings are more nearly perpendicular to the central plane.

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