The synthesis of heterogeneous 7-amino-1-naphthalene sulfonic acid immobilized silica nanoparticles and its catalytic activity was written by Adam, Farook;Hello, Kasim Mohammed;Ben Aisha, Maysun Ramadan. And the article was included in Journal of the Taiwan Institute of Chemical Engineers in 2011.Category: esters-buliding-blocks This article mentions the following:
7-Amino-1-naphthalene sulfonic acid (ANSA) was immobilized onto silica via a simple sol-gel technique to form strong Bronsted acid site, RHANPSO3H. Spherical nano sized catalyst particles were obtained in this study. The 29Si MAS NMR showed the presence of T3, T2, Q3 and Q4 silicon centers. The 13C MAS NMR anal. showed the presence of three chem. shifts consistent with the three carbon atoms of the Pr group. Chem. shifts in the range 122.2-138.9 ppm indicate the presence of the naphthalene ring. The catalytic performance of RHANPSO3H was tested in the esterification of Bu alc. with different mono and di-acids at 117 °C with 88% conversion of resp. alcs. and 100% selectivity towards the ester. The catalyst could be regenerated by washing with ethanol and drying at 180 °C for 24 h. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Category: esters-buliding-blocks).
malonic acid dibutyl ester (cas: 1190-39-2) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Category: esters-buliding-blocks
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics