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Synthesis of 4-amino-3,5-dicyano-arylpyrazoles : part 2 : isolation and charact...

Reaction of (dicyanomethylidene-hydrazino)benzoic acids with chloroacetonitrile, under basic conditions, gave cyanomethyl-3-(7-amino-3,5-dicyano-1H-pyrazolo[4,3-d]pyrimidin-1-yl-benzoates and para substituted cyanomethyl benzoates, in addition to the expected cyanomethyl 3-(4-amino-3,5-dicyano-1H-pyrazol-1-yl)-benzoates.

Graphene nanoribbons from carbon nanotubes

Chemical functionalization of the outer graphene layer of carbon nanotubes (CNT) has been increasingly studied, aiming at the application of CNT in different areas. The functionalization of CNT using the 1,3-dipolar cycloaddition reaction, leading to the formation of cyclic amine groups on the CNT surface [1], was observed to induce the unzipping of the CNT under specific conditions. The CNTs thus functionalize...

Formation of graphene nanoribbons in solution

Recently, the formation of graphene by exfoliation of carbon nanotubes (CNT) has shown increasing interest. This process originates graphene nanoribbons (GNR) that are expected to present excellent electrical properties, depending on their width and on their edge shape [1]. Several methods for the unzipping of graphene from CNT were proposed along the past few years [2-6]. These methods often present some limit...

Functionalization of CNTS with maleic anhydride

The outstanding properties of carbon nanotubes (CNTs) [1] are mainly related with their unique structural features. However, the high π-π staking between the tubes is a major drawback for their manipulation and interaction with other materials. Chemical functionalization has been used as a convenient tool to improve their performance in various applications [2]. The work reports the functionalization of multi-...

General synthetic approach to 2-phenolic adenine derivatives

A simple and general “one pot” procedure for the synthesis of 2,9-diarylpurines with one or multiple hydroxyl groups in the 2- aryl unit is described, from the reaction of 5-amino-4-amidinoimidazoles with phenolic aldehydes.

The diels-alder cycloaddition reaction of 1,3-butadiene to MWCNTs

In this study the funtionalization of MWCNTs with 1,3-butadiene generated in situ from solfolene was investigated. The reaction was studded at two different temperatures (100ºC and 150ºC), mass ratios (CNTs:Sulfolene of 1:1 and 1:2) and different time reaction (2, 4 and 7 days). Thermogravimetric analysis (TGA) showed high degree of functionalization in a range of 10 % to 23 % in weight loss at 800 ºC. The acid...

2-Phenolic-purines : synthesis and antioxidant activity

Synthesis of 6-amino or 6-carbamoylpurines for SAR studies on adenosine receptors

6-Cyanopurines: versatile reagents to generate potentially bioactive compounds

Synthesis of new 6-carboximidamide purines with potential biological activity