Since cocarboxylase, derived from thiamine, is necessary for normal utilization of pyruvate by heart muscle, the importance of adequate body stores of thiamine in patients with chronic heart disease is quite obvious. In order to investigate the occurrence of subclinical thiamine deficiency in patients with chronic heart disease, the thiamine was determined in the four-hour specimen of urine aft...

We found that dodecatungstophosphoric acid (H(3)PW(12)O40), samarium and ruthenium(III) chloride act as efficient catalysts for synthesis of unsaturated 2-phenyl-5(4H)oxazolone derivatives under solvent-free conditions. The key features of the reported protocols are short reaction times, high yields of products, ambient conditions and simple workup.

organocatalyst trityl chloride (ph3ccl), by in situ formation of trityl carbocation with inherent instability, efficiently catalyzes the condensation of dimedone (5,5-dimethyl-1,3-cyclohexanedione) (2 equiv.) with arylaldehydes (1 equiv.) under solvent-free conditions to afford 9-aryl-1,8-dioxo-octahydroxanthenes in high to excellent yields and in relatively short reaction times. formation of t...

a simple, efficient, and high yielding one-pot protocol has been developed for the synthesis of 4h-benzo[b]pyrans scaffolds installing a three-component tandem knoevenagel-cyclocondensation reaction of an aldehyde, malononitrile and dimedone using guanidinium chloride as polyfunctional organocatalyst under solvent-free conditions in high to excellent yields. various aromatic aldehydes were util...

Since cocarboxylase, derived from thiamine, is necessary for normal utilization of pyruvate by heart muscle, the importance of adequate body stores of thiamine in patients with chronic heart disease is quite obvious. In order to investigate the occurrence of subclinical thiamine deficiency in patients with chronic heart disease, the thiamine was determined in the four-hour specimen of urine aft...

Since cocarboxylase, derived from thiamine, is necessary for normal utilization of pyruvate by heart muscle, the importance of adequate body stores of thiamine in patients with chronic heart disease is quite obvious. In order to investigate the occurrence of subclinical thiamine deficiency in patients with chronic heart disease, the thiamine was determined in the four-hour specimen of urine aft...

Sodium chloride salting-in and microwave irradiation were combined to drive thermolysin molecules into mesoporous support to obtain efficiently immobilized enzyme. When the concentration of sodium chloride was 3 M and microwave power was 40 W, 93.2% of the enzyme was coupled to the support by 3 min, and the maximum specific activity of the immobilized enzyme was 17,925.1 U mg(-1). This was a 4....

copper (ii) phthalocyanine and 2,9,16,23 tetrakis nitro copper (ii) phthalocyaninehas been synthesized respectively from phthalonitrile and 4-nitro phthalonitrile under solvent-free condition using two different catalystsovernanodimensionalzeolites. 4-nitro phthalonitrile synthesized from phthalimide in three steps. the newly prepared compounds have been characterized by ir, uv-vis, 1hnmr and m...