scholarly journals Synthesis and Solid State Conformation of Tetrapeptide Amides Containing two Aib and two ( α Me)Phe Residues – Use of Enantiomerically Pure 2‐Benzyl‐2‐methyl‐2 H ‐azirin‐3‐amines as ( α Me)Phe‐Synthons

2020 ◽  
Vol 17 (7) ◽  
Author(s):  
Christoph B. Bucher ◽  
Anthony Linden ◽  
Heinz Heimgartner
Keyword(s):  
Solid State ◽  
Enantiomerically Pure ◽  
Solid State Conformation

Significantly Contrasting Solid State Dynamics of the Racemic and Enantiomerically Pure Crystalline Forms of an Amino Acid

2005 ◽  
Vol 109 (48) ◽  
pp. 22808-22813 ◽  
Author(s):  
Simon J. Kitchin ◽  
Gianina Tutoveanu ◽  
Matthew R. Steele ◽  
Elaine L. Porter ◽  
Kenneth D. M. Harris
Keyword(s):  
Amino Acid ◽  
Solid State ◽  
Enantiomerically Pure ◽  
Crystalline Forms

A solution and solid state conformation of 2-diphenylphosphinoyl-1,3-dioxanes. The nature of O-C-P anomeric interactions.

Tetrahedron ◽  
1992 ◽  
Vol 48 (20) ◽  
pp. 4209-4230 ◽  
Author(s):  
Marian Mikołajczyk ◽  
Piotr P. Graczyk ◽  
Michał W. Wiecorek ◽  
Grzegorz Bujacz
Keyword(s):  
Solid State ◽  
Solid State Conformation

Bicyclic peptides: Solid state conformation of cyclo(Glu-Leu-Pro-Gly-Lys-Leu-Pro-Gly)cyclo(1?-5?)Gly

Biopolymers ◽  
1990 ◽  
Vol 30 (5-6) ◽  
pp. 509-516 ◽  
Author(s):  
Benedetto Di Blasio ◽  
Ettore Benedetti ◽  
Vincenzo Pavone ◽  
Carlo Pedone ◽  
Michele Saviano ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Conformation

scholarly journals Solid State Structure of 2,2,4,4,6,6-Hexa(β-naphthyloxo)cyclophosphazatriene and Dipole Moments of Hexa(aryloxo)cyclophosphazatrienes

1989 ◽  
Vol 44 (5) ◽  
pp. 575-581 ◽  
Author(s):  
Giuliano Bandoli ◽  
Umberto Casellato ◽  
Mario Gleria ◽  
Antonio Grassi ◽  
Enzo Montoneri ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Solid State ◽  
Crystal And Molecular Structure ◽  
Dipole Moments ◽  
X Ray ◽  
Substituent Group ◽  
Cell Dimensions ◽  
Unit Cell Dimensions ◽  
Solid State Conformation ◽  
Do So

The crystal and molecular structure of [NP(OC10H7)2]3 was determined by X-ray analysis.The dipole moments of this compound and of the hexa(phenoxo)cyclotriphosphazatrienes of formula [NP(OC6H3XX′Y)2]3 (X = X′ = H, Y = p-Br; X = m-CH3,. X′ = H. Y = p-Cl; X = X′ = m-CH3, Y = p-Cl; X = X′ = m-CH3, Y = H; X = X′ = H, Y = p-CH(CH3)2; X = X′ = H, Y = p-C(CH3)3) were measured in benzene at 25°C. Crystals of [NP(OC10H7)2]3 are monoclinic with unit cell dimensions a = 24.870(15), b = 7.712(8), c = 27.687(14) Å, β = 115.85(7)°; space group P21/c. The structure was refined to an agreement factor of 0.09. The phosphazene ring deviates (max. deviation 17°) from planarity. and mean distances (A) and angles (°) are P-N 1.58(1). P-O 1.58(1), O-C 1.41(2); P-N-P 120(1), N-P-N 119(1), P-O-C 124(2). The conformations of the naphthyloxo groups at P(2) and P(3) are similar, and different from the group at P(1).Dipole moment analysis showed that the solid state conformation changes in the solution state. The measured value was in agreement with a symmetric conformation in which at the O-P-O plane each naphthyloxo group is rotated by ca. 40-50° from the anti-coplanar arrangement relative to this plane. The dipole moment data for the p-substituted phenoxo derivatives agree with such a conformation, but the analysis of the dipole moment values of phosphazenes having phenoxo groups bearing more than one substituent group and p-CH(CH3)2 substituent failed to do so due to the inherent limitations of the method.

Bayesian methods for the conformational classification of eight-membered rings

2005 ◽  
Vol 61 (5) ◽  
pp. 585-594 ◽  
Author(s):  
J. Pérez ◽  
K. Nolsøe ◽  
M. Kessler ◽  
L. García ◽  
E. Pérez ◽  
...  
Keyword(s):  
Solid State ◽  
Bayesian Methods ◽  
Canonical Forms ◽  
Previous Knowledge ◽  
Data Set ◽  
Torsion Angles ◽  
Structural Database ◽  
Using Data ◽  
Solid State Conformation

Two methods for the classification of eight-membered rings based on a Bayesian analysis are presented. The two methods share the same probabilistic model for the measurement of torsion angles, but while the first method uses the canonical forms of cyclooctane and, given an empirical sequence of eight torsion angles, yields the probability that the associated structure corresponds to each of the ten canonical conformations, the second method does not assume previous knowledge of existing conformations and yields a clustering classification of a data set, allowing new conformations to be detected. Both methods have been tested using the conformational classification of Csp 3 eight-membered rings described in the literature. The methods have also been employed to classify the solid-state conformation in Csp 3 eight-membered rings using data retrieved from an updated version of the Cambridge Structural Database (CSD).

Solid-state conformation of the 1,3,2-oxazaphospholane ring in 2-dialkylamino-3,4-dimethyl-5-phenyl-1,3,2-oxazaphospholane sulfides

2001 ◽  
Vol 12 (3) ◽  
pp. 146-150 ◽  
Author(s):  
Rafal Kruszynski ◽  
Tadeusz J. Bartczak ◽  
Piotr Majewski
Keyword(s):  
Solid State ◽  
Solid State Conformation
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