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The one-pot multicomponent synthesis of 4,4’-arylmethylene-bis(3-methyl-1-phenyl-1H-pyrazol-5-ol) was performed effectively by tandem Knoevenagel-Michael reaction of aryl aldehydes and 5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one in the presence of a catalytic amount of cellulose sulfuric acid as an environmentally friendly biopolymer-based solid acid catalyst at reflux conditions. All of obtained compounds were characterized by FT IR, 1 H and 13 C NMR. This new methodology is of interest due to minimizing the cost operational hazards and environmental pollution, high yields, short reaction time, cost effective and simple work-up. Keywords: Cellulose sulfuric acid, biopolymer, 4,4’-(arylmethylene)bis(3-methyl-1-phenyl-1H-pyrazol-5-ols), 5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one, environmentally friendly. e-mail address: mosaddegh_e@yahoo.com 1. introduCtion Green chemistry emphasizes the development of environmentally benign chemical processes and technologies. 1 Recently, the direction of science and technology has been shifting more towards eco-friendly, natural product resources and reusable catalysts. Thus, natural biopolymers are attractive candidates in the search for such solid support catalysts.

journal of the chilean chemical society

CELLULOSE SULFURIC ACID AS A NEW, BIODEGRADABLE AND ENVIRONMENTALLY FRIENDLY BIO-POLYMER FOR SYNTHESIS OF 4,4'-(ARYLMETHYLENE)BIS(3-METHYL-1-PHENYL-1H-PYRAZOL-5-OLS)