Rapid and efficient diazotization and diazo coupling reactions on silica sulfuric acid under solvent-free conditions

Heck-type reaction of aryldiazonium silica sulfates

“…In following up our research on C-C coupling reactions using ortho-palladated complexes as precatalysts [39][40][41], we have employed various arenediazonium salts synthesized previously [42][43][44] as electrophiles with styrene and methyl acrylate as olefins in Heck-type coupling reactions. The stability of aryldiazonium salts, ArN 2…”

Facile synthesis of 1-naphthol azo dyes with nano SiO₂/HIO₄ under solvent-free conditions

“…Recently HIO 4 /Al 2 O 3 has been reported by Khalilzadeh as a new system for iodination of activated aromatics and 1,3-dicarbonyl compounds [8]. There are a few reports for synthesis of stable diazonium salts at room temperature by using supported reagents [9,10]. The solvent-free approach opens up numerous possibilities for conducting selective organic functional group transformations more efficiently and expeditiously using a variety of supported reagents on mineral oxides, inorganic substances or polymers [11].…”

“…The solvent-free approach opens up numerous possibilities for conducting selective organic functional group transformations more efficiently and expeditiously using a variety of supported reagents on mineral oxides, inorganic substances or polymers [11]. Also azo dyes can be obtained under solvent free condition [10,[12][13][14]. Synthesis of azo compounds with nanosized iron-promoted reductive coupling of aromatic nitro compounds has been reported [15].…”

Environmentally green approach to synthesize azo dyes based on 1-naphthol using nano BF3·SiO2under solvent-free conditions

“…Therefore, due to the importance of the azo dyes, continuous efforts have been made to achieve simple and ecofriendly methodologies for the synthesis of these compounds. Recently, various heterogeneous solid acids have been used for the preparation of azo dyes (19)(20)(21). Although satisfactory yields of products have usually obtained, nano structure solid acids have attracted great interest in recent years due to their particular physical and chemical properties.…”