Homogeneous catalyzed reaction of carbon disulfide and o-phenylene diamine by tetrabutylammonium hydroxide in the presence of potassium hydroxide

Synthesis of 2-mercaptobenzimidazole from the reaction of o-phenylene diamine and carbon disulfide in the presence of potassium hydroxide

“…Our preliminary results (Wang and Liu, 1995, 1996a,b, 1998a,b,c, 2005a,b, 2006a,b, 2007Lam, 2004, 2006;Wang and Hsu, 2006; indicate that the synthesis of MBI from the reaction of o-phenylene diamine and carbon disulfide can be carried out in the presence of quaternary ammonium hydroxide or tertiary amine. No catalytic effect was observed when using tetrabutylammonium bromide (TBAB) as the catalyst.…”

The novel synthetic route of 3,5-dimethyl-1-(3-phenylpropyl)-1H-pyrazole under solid–liquid phase transfer catalysis conditions assisted by an ultrasound application—A study of some kinetic parameters

“…From the kinetic study of experimental results the dependencies of the kinetic data on the whole over of agitation speed, amount of the catalyst, temperature, aqueous sodium hydroxide and higher Ea value are suggestive of an interfacial mechanism [2,[38][39][40][41][42][43][44][45][46]. Primarily, the hydroxide anion deprotonates 3,5-dimethyl pyrazole at the interface, forming an ion-pair (N − Na + ).…”

A Facile and Efficient Procedure for the Synthesis of New Benzimidazole-2-thione Derivatives

“…In the case of aliphatic diamines, the treatment of the dithiocarbamate intermediate with acid gives cyclic thioureas 3 [ 3 ]. In contrast, the reaction with o -phenylenediamine under basic conditions afforded 2-mercaptobenzimidazole ( 4 ) [ 4 , 5 ] ( Figure 1 ). In recent years, cyclic thioureas and mercaptobenzimidazoles have had important industrial applications as anticorrosive agents [ 6 , 7 , 8 ], friction attenuators [ 9 ] and heavy metal adsorbents [ 10 ].…”