Self-assembly of d–f coordination frameworks based on 1H-benzimidazole-5-carboxylic acid: synthesis, structure and luminescence

CrystEngComm ◽  
2011 ◽  
Vol 13 (11) ◽  
pp. 3852 ◽  
Author(s):  
Li Ma ◽  
Yong-Cai Qiu ◽  
Guo Peng ◽  
Jin-Biao Cai ◽  
Hong Deng ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Self Assembly ◽  
Acid Synthesis ◽  
Coordination Frameworks

Self-Assembly of Chiral Organoplatinum(IV) Complexes with Both Carboxylic Acid and Amide Groups

2009 ◽  
Vol 28 (17) ◽  
pp. 5052-5060 ◽  
Author(s):  
Richard H. W. Au ◽  
Michael C. Jennings ◽  
Richard J. Puddephatt
Keyword(s):  
Carboxylic Acid ◽  
Self Assembly

scholarly journals UNUSUAL WAY OF REACTION OF 3-AMINO-4-(5-CHLOROMETHYL-1,2,4-OXADIAZOLE-3-YL)-FURAZAN WITH HYDRAZINE

2017 ◽  
Vol 60 (4) ◽  
pp. 26
Author(s):  
Elena V. Stepanova ◽  
Andrei I. Stepanov
Keyword(s):  
Carboxylic Acid ◽  
Catalytic Amount ◽  
Acid Synthesis ◽  
Chloromethyl Group ◽  
One Pot ◽  
Isolation And Purification ◽  
Long Duration ◽  
Reaction Proceeds ◽  
Selective Reactivity ◽  
Hydrolysis Of

The results of our study of the pathways of selective reactivity of 3-amino-4-(5-chloromethyl-1,2,4-oxadiazole-3-yl)furazan versus 5-unsubstituted or 5-methyl and 5-trifluoromethyl substituted 4-(5R-1,2,4-oxadiazole-3-yl)furazans (R = H, Me, CF3) towards the action of hydrazine are discussed. If the reductive opening of 1,2,4-oxadiazole ring in unsubstituted at the С-5 atom (1,2,4-oxadiazol-3-yl)furazan derivatives under the treatment with hydrazine can be used as a method for the preparation of a range of amidrazones of 4-R-furazan-3-carboxylic acid. 3-amino-4-(5-trifluoromethyl-1,2,4-oxadiazol-3-yl)furazan with hydrazine gives amidoxime of 4-aminofurazan-3-carboxylic acid. 3-amino-4-(5-methyl-1,2,4-oxadiazol-3-yl) furazan is inert to the action of hydrazine, on the contrary the reaction of 3-amino-4-(5-chloromethyl-1,2,4-oxadiazole-3-yl)furazan with hydrazine leads to oxidation of chloromethyl group of titled compound to the carbonyl one. In this case the product of reaction of 3-amino-4-(5-chloromethyl-1,2,4-oxadiazole-3-yl)furazan with hydrazine was isolated in a form of corresponding hydrazonomethyl derivative notably as 3-amino-4-(5-hydrazonomethyl-1,2,4-oxadiazole-3-yl)furazan. A possible reaction mechanism for the formation of hydrazonomethyl group by oxidation reaction of chloromethyl group by hydrazine is proposed. 3-Amino-4-(5-hydrazonomethyl-1,2,4-oxadiazol-3-yl)furazan undergoes a transhydrazination reaction with semicarbazide and thiosemicarbazide. But our attempts to its hydrolysis for the purpose to obtain free aldehyde were unsuccessful. Thus, hydrolysis of hydrazonomethyl derivative in acetic acid in the presence of catalytic amount of sulfuric acid results in azine – N,N'-bis(3-(4-aminofurazan-3-yl)-1,2,4-oxadiazol-5-ylmethylyden)hydrazine – precipitation, long-duration boiling in hydrochloric acid leads to Kishner-Wolff reduction of the carbonyl group to 3-amino-4-(5-methyl-1,2,4-oxadiazol-3-yl)furazan, and hydrolysis in alkaline medium leads to 1,2,4-oxadiazole ring opening to amidoxime of 4-aminofurazan-3-carboxylic acid. Synthesis of 3-amino-4-(5-chloromethyl-1,2,4-oxadiazole-3-yl)furazan (R = CH2Cl) was carried out by condensation of amidoxime of 4-aminofurazan-3-carboxylic acid with an excess of chloroacetyl chloride in toluene at elevated temperature. The reaction proceeds through formation of intermediate product – 3-chloromethylamino-4-(5-chloromethyl-1,2,4-oxadiazol-3-yl)furazan. Removing of N-chloroacetyl group in such obtained intermediate was performed by hydrolysis in acidic media. One-pot synthesis without the need for isolation and purification of intermediate is allowed. The structures of obtained compounds were proved by modern methods of physical-chemical analysis (1H, 13C NMR, IR and MS spectroscopy).Forcitation:Stepanova E.V., Stepanov A.I. Unusual way of reaction of 3-amino-4-(5-chloromethyl-1,2,4-oxadiazole-3-yl)furazan with hydrazine. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2017. V. 60. N 4. P. 26-32.      

scholarly journals On the Application of Oxidative Degradation Reactions in Carboxylic Acid Synthesis.

1969 ◽  
Vol 23 ◽  
pp. 1442-1443 ◽  
Author(s):  
Nguyen Dinh-Nguyen ◽  
Aino Raal ◽  
P. H. Nielsen ◽  
P. H. Nielsen ◽  
Alf A. Lindberg ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Oxidative Degradation ◽  
Acid Synthesis ◽  
Degradation Reactions

Preparation and self-assembly of carboxylic acid-functionalized silica

2007 ◽  
Vol 311 (2) ◽  
pp. 507-513 ◽  
Author(s):  
Yanqing An ◽  
Miao Chen ◽  
Qunji Xue ◽  
Weimin Liu
Keyword(s):  
Carboxylic Acid ◽  
Self Assembly ◽  
Functionalized Silica

Microtribologic Properties of a Covalently Attached Nanostructured Self-Assembly Film Fabricated from Fullerene Carboxylic Acid and Diazoresin

Langmuir ◽  
2002 ◽  
Vol 18 (13) ◽  
pp. 5186-5189 ◽  
Author(s):  
Tingbing Cao ◽  
Fang Wei ◽  
Yanlian Yang ◽  
Lan Huang ◽  
Xinsheng Zhao ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Self Assembly

Size-Defined Cracked Vesicle Formation via Self-Assembly of Gold Nanoparticles Covered with Carboxylic Acid-Terminated Surface Ligands

Langmuir ◽  
2018 ◽  
Vol 34 (41) ◽  
pp. 12445-12451 ◽  
Author(s):  
Jinjian Wei ◽  
Hideyuki Mitomo ◽  
Takeharu Tani ◽  
Yasutaka Matsuo ◽  
Kenichi Niikura ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Carboxylic Acid ◽  
Self Assembly ◽  
Vesicle Formation ◽  
Surface Ligands

Self-Assembly of Polymer and Sheet Structures in Palladium(II) Complexes Containing Carboxylic Acid Substituents

2002 ◽  
Vol 41 (20) ◽  
pp. 5174-5186 ◽  
Author(s):  
Zengquan Qin ◽  
Michael C. Jennings ◽  
Richard J. Puddephatt ◽  
Kenneth W. Muir
Keyword(s):  
Carboxylic Acid ◽  
Self Assembly
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