scholarly journals Orthoamide, LXV [1]. Kondensationsreaktionen von Amidinen, Guanidinen, Hydrazin und Hydrazin-Derivaten mit Orthoamiden von Alkincarbonsäuren / Orthoamides,LXV [1]. Condensation Reactions of Amidines, Guanidines, Hydrazine and Hydrazine Derivatives with Orthoamides of Alkyne Carboxylic Acids

2007 ◽  
Vol 62 (8) ◽  
pp. 1015-1029 ◽  
Author(s):  
Willi Kantlehner ◽  
Jochen Mezger ◽  
Rüdiger Stieglitz ◽  
Kai Edelmann ◽  
Hansjörg Lehmann ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Carboxylic Acids ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Aromatic Acid ◽  
Hydrazine Derivative ◽  
Hydrazine Derivatives ◽  
Condensation Products ◽  
Ketene Aminals

The orthoamide derivatives 4 react with amidines 10 and guanidines 11 to give 4-dimethylaminopyrimidines 12. The 3-dimethylamino-pyrazoles 13a - c can be prepared from orthoamides 4 and hydrazine. The hydrazine derivative 14, whose constitution was established by crystal structure analysis, is obtained in low yield when hydrazine is added dropwise to a boiling solution of 4d in THF.Methyl- and phenylhydrazine, undergo reaction with the orthoamides 4a, c yielding mixtures of the isomeric pyrazoles 19 and 20. The reaction of 4c with acylhydrazines 21a - e affords the pyrazole 13b. The pyrazole 26 is produced in the reaction of 4a and acet-hydrazide according to this scheme, whereas 4a reacts with aromatic acid hydrazides 21c - e to give condensation products, which are presumably amidrazones 28. The 4,5-diaza-octatetraene derivative 30 results from the reaction of 4c with p-toluenesulfonylhydrazide. Ketene aminals 34a - c are the products of the reaction of the orthoamides 4b - d with 4,4-dimethylthiosemicarbazide 34, which cyclize on heating to give highmelting pyrazolethiones 35a - c. According to the crystal structure analysis of 35c the compounds have zwitterionic character and are associated via hydrogen bridges in the solid state.

Complexes of N-Aryltriphenylphosphinimines with Mercury(II) Halides

1999 ◽  
Vol 54 (7) ◽  
pp. 858-862 ◽  
Author(s):  
Thomas P. Braun ◽  
Paul A. Gutsch ◽  
Hans Zimmer
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Structure Analysis ◽  
Nmr Spectra ◽  
Crystal Structure Analysis ◽  
Phosphonium Salts ◽  
X Ray

The synthesis, IR and 31P NMR spectra of the complexes of various N-aryltriphenylphosphinimines with some mercury dihalides as well as the corresponding phosphonium salts are reported. It is shown by an X-ray crystal structure analysis of the complex of the unsubstituted phosphinimine with HgCl2 that in the solid state these complexes form dimers via two Hg ∙∙∙ μ2- Cl ∙∙∙ Hg bridges.

Hantzsch 1,4-dihydropyridine esters and analogs: candidates for generating reproducible one-dimensional packing motifs

2009 ◽  
Vol 65 (3) ◽  
pp. 375-381 ◽  
Author(s):  
R. S. Rathore ◽  
B. Palakshi Reddy ◽  
V. Vijayakumar ◽  
R. Venkat Ragavan ◽  
T. Narasimhamurthy
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Hydrogen Bonds ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Structural Requirements ◽  
One Dimensional ◽  
High Binding ◽  
Solid State Materials ◽  
Derivatives Of

Examination of the symmetric Hantzsch 1,4-dihydropyridine ester derivatives of the prototypical nifedipine molecule indicates the tendency of this class of molecule to form a common packing motif. Crystal structure analysis of 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylic diesters and analogs reveals that they form extended chains, characterized as the C(6) packing motif, via intermolecular (amine) N—H...O=C (C3,C5 carbonyl) hydrogen bonds. In addition, all the prepared derivatives also satisfy the basic structural requirements for their high binding efficiency to the receptor. The reproducible C(6) packing motif observed among these compounds has a use in the design of solid-state materials.

The chlorination of some 2,6-substituted 4-chlorophenols; X-ray crystal structure of (E)-(2RS,5RS)-2,4,5,6,6-Pentachloro-2-methyl-6-nitrohex-3-enoic acid

1984 ◽  
Vol 37 (9) ◽  
pp. 1963 ◽  
Author(s):  
MP Hartshorn ◽  
RJ Martyn ◽  
J Vaughan
Keyword(s):  
Crystal Structure ◽  
Acetic Acid ◽  
Hydrochloric Acid ◽  
Carboxylic Acids ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Enoic Acid ◽  
X Ray

Chlorination of 4-chloro-2-methyl-6-nitrophenol (4) with chlorine in acetic acid containing concentrated hydrochloric acid gives the epimeric acyclic carboxylic acids (6) and (7). The structure of compound (6) was determined by X-ray crystal structure analysis. No such acyclic compounds are formed in similar chlorinations of 2,4-dichloro-6-nitrophenol (13a) or 2,4-dichloro-6-methylphenol (13b). The mode of formation of compounds (6) and (7) is discussed.

Synthese und Kristallstrukturanalyse von Undecacarbonyl- (μ-trifluormethylisocyanid)trieisen, Fe3(μ-CNCF3)(CO)11 / Synthesis and Crystal Structure Determination of Undecacarbonyl(μ-trifluoromethylisocyanide)triiron, Fe3(μ-CNCF3)(CO)11

1984 ◽  
Vol 39 (6) ◽  
pp. 721-726 ◽  
Author(s):  
Irene Brüdgam ◽  
Hans Hartl ◽  
Dieter Lentz
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Structure Analysis ◽  
Structure Determination ◽  
Crystal Structure Analysis ◽  
Crystal Structure Determination ◽  
Synthesis And Crystal Structure ◽  
Infrared Data ◽  
C Nmr

AbstractThe unstable trifluorom ethylisocyanide can be stabilized on the Fe3(CO)11 framework. Infrared data suggest that the isocyanide ligand occupies bridging positions in the solid state and in solution. This fact has been confirmed by the crystal structure analysis and by 13C NMR measurements.

scholarly journals Synthesis and Solid-state Structures of 1,3- and 1,4-Bis(diethylgallyl) benzene

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1375-1380
Author(s):  
Joseph Izundu ◽  
Peter Jutzi ◽  
Beate Neumann ◽  
Henning Sielemann ◽  
Hans-Georg Stammler
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Structural Studies ◽  
X Ray ◽  
Coordination Behavior ◽  
Redistribution Reactions ◽  
Solid State Structures

The compounds 1,3-bis(diethylgallyl)benzene (3) and 1,4- bis(diethylgallyl)benzene (6) were prepared by reaction of the corresponding chloromercuriobenzenes with an excess of triethylgallium by applying pressure and higher temperatures. These compounds very easily undergo redistribution reactions in solution and in the solid state. Extremely air-sensitive crystals suitable for an X-ray crystal structure analysis were obtained from triethylgallium as solvent. The structural studies revealed the presence of tetra-coordinated carbon and gallium atoms in symmetric aryl-diethylgallyl bridging units. The coordination behavior of 3 and 6 in the solid state is quite different from that of the corresponding methyl-substituted compounds

Sign in / Sign up

Export Citation Format

Share Document