Previous work from this laboratory (1, 2) has demonstrated that the vasopressin from beef posterior pituitary lobes, after partial purification by the procedure of Kamm et al. (3), can be obtained in a high degree of purity by means of countercurrent distribution with the system 0.09 M p-toluenesulfonic acid-n-butyl alcohol. Although no detectable difference was observed in the physical propert...

Sludge palm oil (SPO) is an attractive feedstock and a significant raw material for biodiesel production. The use of SPO can lower the cost of biodiesel production significantly. In this study biodiesel fuel was produced from SPO by esterification process using P-toluenesulfonic acid (PTSA) as acid catalyst in different dosages in presence of methanol to convert free fatty acid (FFA) to fatty a...

Poly(ester-acetals) have been prepared from isopropylideneglyceryI azelaaldehydate dimethyl acetal and from methyl azelaaldehydate glycerol acetal. Acid hydrolysis of isopropylideneglyceryl azelaaldehydate led to oligomeric poly (ester-acetals) with six to seven repeating units and carboxylic acid endgroups from which the sodium salt and the methyl ester could be prepared. The polymer sodium sa...

Pretreatment is a necessary step to converting lignocellulosic biomass from its native form into more accessible for the value-added utilization of main components. Herein, we developed one-step acid bleachable pretreatment method using recyclable hydrotrope (p-toluenesulfonic acid, p-TsOH) and chlorate achieve fibers bleaching lignin extraction simultaneously. Under condition p-TsOH concentrat...

A simple, efficient and highly diastereoselective one-pot three-component synthesis of functionalized 2,6-disubstituted-4-tosyloxytetrahydropyrans was performed. The synthesis features an optimized Prins cyclization in which an aromatic homoallylic alcohol, an aromatic/aliphatic aldehyde, and p-toluenesulfonic acid (catalyst and reagent) are reacted in the presence of molecular sieves (MS) 4 Å ...

New routes to porous materials can help lower production costs, improve sustainability, and broaden design options. Here, we use a selection of organic acids as catalysts in the synthesis hyper-cross-linked polymers from benzyl methyl ether compounds. This approach provides new route metal-free addresses one largest setbacks by allowing simple recovery recycling nonmetallic catalyst. By p-tolue...

A novel heterogeneous efficient procedure has been developed for the chemoselective synthesis of acylals (1,1-diacetates) under solvent-free conditions. A novel catalyst prepared by the sulfuric acid catalyzed copolymerization of p-toluenesulfonic acid and paraformaldehyde displays extremely high activities for the title reactions, affording average yields over 90% within several minutes. A com...