Reactive intermediates in peptide synthesis: Molecular and crystal structures of HOAt and HOOBt, and some ester and amide derivatives of HOBt, HOAt and HOOBt

1998 ◽  
Vol 5 (4) ◽  
pp. 247-258 ◽  
Author(s):  
Marco Crisma ◽  
Giovanni Valle ◽  
Vittorio Moretto ◽  
Fernando Formaggio ◽  
Claudio Toniolo ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Peptide Synthesis ◽  
Reactive Intermediates ◽  
Amide Derivatives ◽  
Molecular And Crystal Structures ◽  
Derivatives Of

Molecular and crystal structures of some novel derivatives of 3-aryl-7-arylidene-3,3a,4,5,6,7-hexahydroindazoles

2007 ◽  
Vol 52 (2) ◽  
pp. 243-252
Author(s):  
V. V. Abakumov ◽  
S. V. Shishkina ◽  
R. I. Zubatyuk ◽  
I. M. Gella ◽  
N. S. Pivnenko ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Molecular And Crystal Structures ◽  
Derivatives Of

scholarly journals Crystal structures of two hydrazide derivatives of mefenamic acid, 3-(2,3-dimethylanilino)-N′-[(E)-(furan-2-yl)methylidene]benzohydrazide and N′-[(E)-benzylidene]-2-(2,3-dimethylanilino)benzohydrazide

2021 ◽  
Vol 77 (3) ◽  
pp. 242-246
Author(s):  
Shaaban K. Mohamed ◽  
Joel T. Mague ◽  
Mehmet Akkurt ◽  
Mustafa R. Albayati ◽  
Sahar M. I. Elgarhy ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Benzene Ring ◽  
Network Structure ◽  
Mefenamic Acid ◽  
Three Dimensional ◽  
Dimensional Network ◽  
Molecular And Crystal Structures ◽  
Derivatives Of

The conformation about the central benzene ring in the molecule of (I), C20H19N3O2, is partially determined by an intramolecular N—H...O hydrogen bond. In the crystal, chains parallel to the c axis are generated by intermolecular N—H...O hydrogen bonds with the chains assembled into a three-dimensional network structure by intermolecular C—H...O hydrogen bonds and C—H...π(ring) interactions. The molecule of (II), C22H21N3O, differs from (I) only in the substituent at the hydrazide N atom where a phenylmethylene moiety for (II) is present instead of a furanmethylene moiety for (I). Hence, molecules of (I) and (II) show similarities in their molecular and crystal structures. The conformation of the central portion of the molecule of (II) is also therefore partially determined by an intramolecular N—H...O hydrogen bond and intermolecular N—H...O hydrogen bonds form chains parallel to the c axis. Likewise, the chains are connected into a three-dimensional network by C—H...O hydrogen bonds and C—H...π(ring) interactions.

Reactive Intermediates in Peptide Synthesis:  First Crystal Structures andab InitioCalculations of 2-Alkoxy-5(4H)-oxazolones from Urethane-Protected Amino Acids

1997 ◽  
Vol 119 (18) ◽  
pp. 4136-4142 ◽  
Author(s):  
Marco Crisma ◽  
Giovanni Valle ◽  
Fernando Formaggio ◽  
Claudio Toniolo ◽  
Alessandro Bagno
Keyword(s):  
Amino Acids ◽  
Crystal Structures ◽  
Peptide Synthesis ◽  
Reactive Intermediates

Synthesis, molecular and crystal structures of arene derivatives of [Ru6C(CO)17]

1993 ◽  
pp. 2951 ◽  
Author(s):  
Dario Braga ◽  
Fabrizia Grepioni ◽  
Emilio Parisini ◽  
Paul J. Dyson ◽  
Alexander J. Blake ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Molecular And Crystal Structures ◽  
Derivatives Of

scholarly journals Crystal structures of 1-bromo-3,5-bis(4,4-dimethyl-1,3-oxazolin-2-yl)benzene 0.15-hydrate and 3,5-bis(4,4-dimethyl-1,3-oxazolin-2-yl)-1-iodobenzene

2015 ◽  
Vol 71 (10) ◽  
pp. 1125-1131
Author(s):  
Timo Stein ◽  
Frank Hoffmann ◽  
Michael Fröba
Keyword(s):  
Hydrogen Bonding ◽  
Crystal Structures ◽  
Ring Systems ◽  
Π Interactions ◽  
Molecular And Crystal Structures ◽  
Almost All ◽  
Derivatives Of

The bromo and iodo derivatives of ameta-bis(1,3-oxazolin-2-yl)-substituted benzene, C16H19BrN2O2·0.15H2O (1) and C16H19IN2O2(2), have been prepared and studied in terms of their molecular and crystal structures. While the former crystallizes as a sub-hydrate, with 0.15 formula units of water and shows an almost all-planar arrangement of the three ring systems, the latter crystallizes solvate-free with the flanking heterocycles twisted considerably with respect to the central arene. Non-covalent contacts include parallel-displaced π–π interactions and (non-classical) hydrogen bonding for both (1) and (2), as well as relatively short I...N contacts for (2).

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