Introduction Hydroxyl ion release from calcium hydroxide is responsible for the key attributes of broad spectrum antimicrobial activity, penetration into biofilms, inhibition of endotoxins, and dissolution of organic tissues.1,2 The maximum solubility of calcium hydroxide in water at 25C is only 0.159 g/100mL (0.16%), and this reduces to 0.140 g/100 mL (0.14%) at 40C, with an accompanying decre...

This research includes synthesis of new derivatives benzimidazole , the compound (A1*) prepared by reaction o-phenylene diamine with carbon disulfide in alcoholic potassium hydroxide. Then was ethyl chloroacetate and hydroxide to give ester (A2*). preparation hydrazide (A3*) (A2*) hydrazine hydrate (80%). we used prepare pyrazole (A4), then mannich basses (A4) different primary aromatic amines ...

A novel approach to the synthesis of 6-amino-7-hydroxyflavone (1) is described. Reaction in acetone of 2',4'-dihydroxy-5'-nitroacetophenone and benzoyl chloride in the presence of potassium carbonate affords 3-benzoyl-7-hydroxy-6-nitroflavone, which is cleaved in 5% ethanolic potassium hydroxide to give 1-(2,4-dihydroxy-5-nitrophenyl)-3- phenyl-1,3-propanedione. The 1,3-diketone thus formed is ...

Abstracfi This paper describes preparations of o(and r--) chlorolactic acids having enantiomeric excesses greater than 977o by o(and l-) lactate dehydrogenase catalyzed reduction of chloropyruvic acid with NADH. In syntheses carried out on 0.1{).5-mol scales, the NADH was regenerated in situ by using glucose 6-phosphate and glucose 6-phosphate dehydrogenase. The enantiomerically enriched chloro...

Two alternative and complementary one-pot procedures for the direct transformation of 2-amino alcohols to N-tosyl aziridines are presented. The unsubstituted parent compound and its less hindered homologues can be obtained in high yields by tosylation and in situ cyclisation effected by potassium hydroxide in water/dichloromethane. Higher substituted amino alcohols give better yields using pota...

Activated carbon (AC) was prepared from Lapsi seed stone by chemical activation with Potassium hydroxide at 400°C. The AC was characterized by pH, moisture content, Fourier transform-infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), methylene blue (MB) and iodine (I2) number. FT-IR spectra indicated the presence of various oxygen containing functional groups on the surface of AC...

A polarographic method for the determination of as little as 1 pig. of gold in blood and serum samples is described. The relative error is 2.1%. After the sample is dry ashed at 550#{176}, the gold is extracted into ether as the chloride, to separate it from interfering copper and iron. A polarogram of the gold sample is obtained in 2 M potassium hydroxide. The method should be applicable to th...

Two grams of Kahlbaum’s alanine dissolved in 50 cc. of water were oxidized with 500 cc. of a solution containing 10.8 grams of potassium permanganate and 37.0 grams of potassium hydroxide (30 molecules). Vigorous oxidation took place at once and the temperature of the mixture rose to 37” C. After standing for forty-eight hours at room temperature complete decolorization had taken place; the pro...

The reactivity of sodium borohydride in the presence of other species has been examined by adiabatic calorimetry. In combination with water, sodium borohydride exhibits an exotherm at room temperature accompanied by generation of gas (presumed to be hydrogen). Addition of potassium hydroxide to a sodium borohydride-water mixture is found to stabilize the solution and require a higher temperatur...