Synthesis of 1,3-thioxoketones from salicylaldehyde

A method for the synthesis of monothiodibenzoylmethanes was developed. The method involves a reaction of potassium thioacetate with 1-(2-hydroxyphenyl)-3-phenylpropynone prepared from salicylaldehyde.     

Effect of composition of precipitated calcium-copper orthophosphates on their character

A group of crystalline and amorphous calcium-copper phosphates was synthesized by the exchange reaction between sodium orthophosphate and calcium and copper(II) nitrates in solutions within a wide range of reagent ratios 0 ≤ Cu×100/(Cu + Ca) ≤ 100. Conclusions on the effect of the Cu×100/(Cu + Ca) ratio on the phase composition of the substances and on the state of chemical bonds therein were made on the basis of the results of X-ray phase analysis and IR Fourier and electronic spectroscopy.     

Facile syntheses of 2-substituted 3-cyanochromones

A simple and general route to 3-cyanochromones containing various substituents on position 2 of the ring is developed. The method is based on condensation of 3-(2-hydroxyphenyl)-3-oxopropionitrile with acid chlorides or anhydrides in pyridine at room temperature.     

Calcium Phosphate Dental Materials Prodused with the Help of Natural Alumosilicates

Abstract

Calcium phosphates are well known to be perspective as biomaterials, for example. the dental ones. There are two tendencies in investigation and design of such materials. They are the search of porous biomaterials and development of dense bioceramics on the basic of hydroxópatite and crystallized calcium phosphate glasses. Control of glasses crystallization with the help of modificators and nucleating agents is the main way for producing dense biomaterials [1, 2]. We used natural alumosiiicates, for example, kaolin as a reagent and modificator for calcium polyphosphate to achieve a good quality of materials without stages of glass formation and glass crystallization.