Study of restrained amide rotation in ?,??-substituted ?3-piperideine and interconversions of substituted 10-sila-2-azaanthracene by the method of analysis of form of NMR lines

1986 ◽  
Vol 26 (5) ◽  
pp. 819-820
Author(s):  
A. �. Aliev ◽  
V. A. Rezakov ◽  
A. A. Fomichev
Keyword(s):  
Amide Rotation

Free Activation Energies and Activation Volumes for the Amide Rotation in Some Peptides Studied by High Pressure 1H-High Resolution NMR

1982 ◽  
Vol 37 (1-2) ◽  
pp. 51-56 ◽  
Author(s):  
H. Hauer ◽  
H.-D. Lüdemann ◽  
R. Jaenicke
Keyword(s):  
High Pressure ◽  
High Resolution ◽  
Pressure Dependence ◽  
Nmr Spectra ◽  
Conformational Transition ◽  
Activation Energies ◽  
High Resolution Nmr ◽  
Maximum Contribution ◽  
The Given ◽  
Amide Rotation

From the pressure dependence of 1H high resolution NMR spectra of two dipeptides (glycylsarcosine and N-acetyl-ʟ-proline-NH-methylamide in the range 0.1 MPa ≤p ≤ 150 MPa the activation volumes ⊿V≠ for the amide rotation are derived. This conformational transition is characterized for glycylsarcosine by ⊿V≠ = 4 ± 1 cm3 · mol-1 and for. the proline derivative by ⊿V≠ = 7.5±1 cm3 · mol-1. From the given results the maximum contribution of proline cis ⇌ trans isomerisation to the pressure dependence of the rate of reactivation of proteins can be estimated to ~ - 30% per MPa and proline present.

Triaziridines. Part V. A semiempirical MNDO study of nitrogen inversion and amide rotation in Formyltriaziridines

1986 ◽  
Vol 69 (6) ◽  
pp. 1461-1468 ◽  
Author(s):  
Jos� Kaneti ◽  
Lienhard Hoesch ◽  
Andr� S. Dreiding
Keyword(s):  
Nitrogen Inversion ◽  
Amide Rotation ◽  
Semiempirical Mndo

Chemistry of cyclic aminooxycarbenes

1997 ◽  
Vol 75 (9) ◽  
pp. 1281-1294 ◽  
Author(s):  
Philippe Couture ◽  
John Warkentin
Keyword(s):  
Activation Energy ◽  
Phenyl Isocyanate ◽  
Dimethyl Acetylenedicarboxylate ◽  
Methyl Propiolate ◽  
Amide Rotation

A series of oxazolidin-2-ylidenes and one tetrahydro-1,3-oxazin-2-ylidene, generated by thermolysis of Δ3-1,3,4-oxadiazolines in benzene at 90 °C, were intercepted by insertion into the OH bond of phenols. In two cases the initial products rearranged to N-(2-aryloxyethyl)-N-methylformamides. The activation energy for rotation about the amide CN bond of those ultimate products was measured as 20.4 kcal/mol. The aminooxycarbenes reacted with two equivalents of methyl or phenyl isocyanate to give spiro-fused hydantoins. Major products from the reactions of the N-carbonyl carbenes with dimethyl acetylenedicarboxylate or with methyl propiolate were 2-oxazolines resulting from apparent acyl transfers from N to C in the proposed dipolar intermediates; minor products of 1:2 (carbene:trap) stoichiometry were also observed. Keywords: nucleophilic carbene, aminooxycarbene, oxadiazoline, amide rotation, oxazolidine.

scholarly journals Amide rotation trajectories probed by symmetry

2017 ◽  
Vol 15 (32) ◽  
pp. 6764-6772 ◽  
Author(s):  
Vladimir Kubyshkin ◽  
Nediljko Budisa
Keyword(s):  
Amide Rotation

Here we utilized symmetric proline analogues in order to mimic trajectories of the amide rotation and characterize differences in the rotation scenarios.

Tertiary Amide Rotation in a Nanoscale Host

2007 ◽  
Vol 2007 (16) ◽  
pp. 2722-2728 ◽  
Author(s):  
Riccardo Salvio ◽  
Lionel Moisan ◽  
Dariush Ajami ◽  
Julius Rebek
Keyword(s):  
Tertiary Amide ◽  
Amide Rotation

Barriers to amide rotation in piperidides and related systems. Unambiguous assignments using carbon-13 magnetic resonance

1975 ◽  
Vol 40 (24) ◽  
pp. 3547-3550 ◽  
Author(s):  
Jerry A. Hirsch ◽  
Robert L. Augustine ◽  
Gabor Koletar ◽  
Harold G. Wolf
Keyword(s):  
Magnetic Resonance ◽  
Amide Rotation
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