Convenient and rapid diazotization and diazo coupling reaction via aryl diazonium nanomagnetic sulfate under solvent-free conditions at room temperature

Graphene Derivative As a Highly Efficient Nitrosonium Source: A Reusable Catalyst for Diazotization and Coupling Reaction

“…Among metal free catalysts, graphene oxide (GO), also known as “carbo‐catalyst”, has been reported to enable several organic transformations replacing hazardous chemical reagents . [9–15] In recent years, organic colour chemistry is undergoing the fast development as a result of the trends for dye applications in electronic devices, sensors and biomedical uses . Azo dye compounds are the most commonly used class of organic dyes due to their applications in different field such as dyeing textile, fibre, biological‐pharmacological activities, organic synthesis and as materials with excellent optical and photoelectric properties .…”

Substituent and Solvent Polarity on the Spectroscopic Properties in Azo Derivatives of 2-Hydroxynaphthalene and Their Difluoroboranes Complexes

“…In recent years, several methods have been reported for the synthesis of aromatic azo components [ 8 , 57 , 58 , 59 , 60 ]. Although remarkable developments have been achieved in this field still the most important method for the preparation of these classes of compounds is the diazotization-azo coupling reaction.…”

“…Azo compounds are attractive targets for organic synthesis methodology due to their widespread applications in many areas of technology and medicine. Azo dyes are the most important group of all synthetic dyes that are used extensively for textile dyeing [ 1 , 2 ], as pharmaceuticals [ 3 , 4 , 5 , 6 , 7 ] in organic synthesis [ 8 , 9 ]. Moreover, azobenzenes recently have been targeted for potential applications in areas of nonlinear optics [ 10 ], optical storage media [ 11 ], chemosensory [ 12 , 13 ], liquid crystals [ 14 ], photochemical molecular switches [ 15 , 16 ], and nanotubes [ 17 ].…”

“…The main motivation to undertake the current study is to describe the photochemical properties of 1-phenylazonaphthalen-2-ols difluoroboranes (5-8) (Scheme 2) in solutions of different polarity and to compare them with non-BF2 chelated pattern compounds (1)(2)(3)(4). In the present work, the synthesis of phenylazonaphthalen-2-ols (1-4) and their difluoroboranyl derivatives (5)(6)(7)(8) was successfully performed. The structures of the newly synthesized dyes were confirmed by the spectroscopic technique of 1 H, 11 B, 13 C, 15 N, and 19 F NMR.…”

Highly Efficient Synthesis of New 2H-Chromene Dyes using Cu-SBA-15

“…Azo compounds are very considerable in dyes and pigments industry 21 . They are the main class of all synthetic dyes that are widely used in the world 22 .…”