3,4-ِdihydropyrano[c]chromene derivatives were synthesized using sulfonic acid functionalized silica (sio2-pr-so3h) as a highly efficient heterogenous solid acid catalyst via one-pot three-component condensation of aromatic aldehydes with malononitrile and 4-hydroxycoumarin in excellent yields.

sulfuric acid ([3-(3-silicapropyl)sulfanyl]propyl]ester (saspspe) is employed as a recyclable catalyst for the silylation of hydroxyl groups. a good range of primary, secondary alcohols and phenolic hydroxyl groups were effectively converted into their corresponding trimethylsilyl ethers with hexamethyldisilazane in the presence of catalytic amounts of saspspe at room temperature with short rea...

3,4-ِDihydropyrano[c]chromene derivatives were synthesized using sulfonic acid functionalized silica (SiO2-Pr-SO3H) as a highly efficient heterogenous solid acid catalyst via one-pot three-component condensation of aromatic aldehydes with malononitrile and 4-hydroxycoumarin in excellent yields.

Mechanochemical method is effective in manufacturing active sites of solid catalyst, which has great potential to improve the activity heterogenous catalyst advanced oxidative processes organic wastewater....

introduction: dye removal from industrial wastewater has been considered as one of the most environmental issues. recently, new methods of treatment such as catalytic ozonation have been used to increase dye removal efficiency. so, the efficiency of catalytic ozonation by copper coated zeolite as a catalyst in the removal of reactive red 198 was investigated. materials & methods: in order to re...

AlPO4 solid acid catalyst was prepared in order to use it transesterification reaction of edible oil after supporting with tungsten oxide. The maximum conversion obtained 78.78% at concentration (5gm.), temperature 70°Ϲ, 30/1 methanol/edible molar ratio, and time 5hr. study kinetics the indicates that has an 3/2, while value activation energy for is 51.367 kJ/mole frequency factor equal 26219.1...

Biodiesel is one of the renewable energy sources that an alternative to fossil diesel non-toxic and produces less CO emissions. Transesterification process a conventional mechanism produce biodiesel from vegetable oil with homogeneous or heterogenous catalyst. However, catalysts are considered as more efficient than homogenous catalysts. Recently, TiO2/CaO has been used compound catalyst palm o...

Glycerol valorisation is crucial for long-term economic viability due to the rise in biodiesel synthesis on a global scale. Therefore, it highly desirable convert bioglycerol into platform chemicals like solketal, fuel additive which will help sustain industry. Herein, glycerol transformed solketal utilising heterogeneous catalyst derived from SO3H-functionalized aromatic carbonaceous material ...

In the past few years multi component reactions have captured the attention of synthetic chemists as they provide  easy  access  to diverse  complex  organic molecules through  carbon -  carbon   and  carbon - heteroatom  bond  formations  in tandem manner with simple easy  to carry out  reaction  conditions in short  time. 1,8-dioxo-octahydroxanthene is a significant class of oxygen containing...

Tremendous growth in the number of automobiles developed and developing global economies has exorbitantly boosted competition for petroleum products. Petroleum products derived from fossil fuels are predominantly responsible environmental pollution as unburnt hydrocarbon (HC), carbon monoxide (CO), oxides nitrogen (NOx) & dioxide (CO2) emissions released fuel combustion. In view increasing stri...