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Chemija / Chemistry

ISSN 0235-7216
ISSN 2424-4538 (online)

2013 m. Nr. 1

The green synthesis of new azo dyes derived from salicylic acid derivatives catalyzed via baker’s yeast and solid acid catalysis
bbas TEIMOURI, Alireza Najafi CHERMAHINI, Mohammad Hassan GHORBANI

The synthesis of a series of new azo dyes containing 4-sulfonyl azide benzenediazonium salt, salicylic acid, 2-hydroxy benzoic acid, and 2,4-dihydroxy benzoic acid derivatives over eco-friendly baker’s yeast, modified montmorilonite K10, zeolites and sulphated zirconia are described. These inexpensive, noncorrosive and reusable catalysts were found to exhibit bifunctional catalytic properties for these reactions. No considerable decrease in the efficiency of the catalysts was observed after four cycles of operation. The new method totally avoids the use of acid, alkali or toxic solvents in diazotization and azocoupling reactions.

Keywords: environmental compatibility, diazotization, azocoupling, dyes, baker’s yeast, clays, zeolite, sulfated zirconia

Issues:

2017 - Vol.28
No. 1, No. 2, No. 3, No. 4

2016 - Vol.27
No. 1, No. 2, No. 3, No. 4

2015 - Vol.26
No. 1, No. 2, No. 3, No. 4

2014 - Vol.25
No. 1, No. 2, No. 3, No. 4

2013 - Vol.24
No. 1, No. 2, No. 3, No. 4

2012 - Vol.23
No. 1, No. 2, No. 3, No. 4

2011 - Vol.22
No. 1, No. 2, No. 3, No. 4

2010 - Vol.21
No. 1, No. 2-4

2009 - Vol.20
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2008 - Vol.19
No. 1, No. 2, No. 3-4

2007 - Vol.18
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2006 - Vol.17
No. 1, No. 2-3, No. 4

2005 - Vol.16
No. 1, No. 2, No. 3-4

2004 - Vol.15
No. 1, No. 2, No. 3, No. 4

2003 - Vol.14
No. 1, No. 2, No. 3, No. 4

2002 - Vol.13
No. 1, No. 2, No. 3, No. 4

2001 - Vol.12
No. 1, No. 2, No. 3, No. 4