%0 Journal Article
%T A general and efficient synthesis of pyrazoles catalyzed by Sc(OTf)3 under solvent-free conditions
%A Xiong
%A Wei
%A Chen
%A Jiu-Xi
%A Liu
%A Miao-Chang
%A Ding
%A Jin-Chang
%A Wu
%A Hua-Yue
%A Su
%A Wei-Ke
%J Journal of the Brazilian Chemical Society
%D 2009
%I Sociedade Brasileira de Qu¨Şmica, SBQ
%R 10.1590/S0103-50532009000200023
%X pyrazoles were prepared in excellent yields via solventless condensation of various 1,3-diketones (r1cochxcoch3, r1 = me, ph; x = h, me, cl) and hydrazines, acylhydrazines or sulfonyl hydrazines in the presence of a catalytic amount of sc(otf)3 at room temperature. additionally, the catalyst could be recovered easily after the reactions and reused without evident loss in activity.
%K scandium(iii) triflate
%K pyrazoles
%K 1
%K 3-diketones
%K hydrazines
%K hydrazides
%K solvent-free.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532009000200023&lng=en&nrm=iso&tlng=en