Research Article

• Vasiliy G. Shtamburg ,
  Victor V. Shtamburg ,
  Andrey A. Anishchenko ,
  Alexander V. Mazepa :
  The peculiarities of the 4-carboxyphenylglyoxal and N-alkoxy-N’-arylureas interaction339-344en [195.80 kB - PDF]EPA-02286-00091-0010

  It was found that 3-alkoxy-4,5-dihydroxyimidazolidin-2-ones are the only products of interaction of N-alkoxyureas with arylglyoxals which have strong electronegative substituent in the forth position of the aryl moiety. The possibility of obtaining such products as 3-alkoxy-1-aryl-5-(4-carboxyphenyl)-4,5- dihydroxyimidazolidin-2-ones, 3-alkoxy-1-alkyl-5-(4-carboxyphenyl)-4,5- dihydroxyimidazolidin-2-ones and 3-alkoxy-1-phenyl-4,5-dihydroxy-5-(4-nitrophenyl)- imidazolidin-2-ones has been verified in the experimental way. In most the cases 3-alkoxy-4,5-dihydroxyimidazolidin-2-ones were produced as a mixture of diastereomers.

  Keywords: N-alkoxy-N’-arylureas, N-alkoxy-N’-alkylureas, arylglyoxals; synthesis; 3-alkoxy-1-aryl-5-(4-carboxyphenyl)-4,5-dihyd-roxyimidazolidin- 2-ones; 5-(4-carboxyphenyl)-4,5-dihydroxy-1-methyl-3-propyloxyimidazolidin-2-one; 3-alkoxy-4,5-dihydroxy-5-(4-nitrophenyl)-1-phenylimidazolidin-2-ones.

• V. Anitha Rani ,
  Y. Bharathi Kumari :
  [BMIM]BF4: an efficient ionic liquid medium for one-pot of 1H-imidazole-5(4H)-one derivatives345-348en [115.85 kB - PDF]EPA-02286-00091-0020

  The environment-friendly one-pot condensation reaction of (Z)-4- benzylidene-2-methyloxazol-5(4H)-one with phenylhydrazine and (phenyliminomethyl)benzene in the presence of [BMIM]BF4 as medium at 80-85 oC for 1-1.5 h to form 4-(benzylidene/substituted benzylidene)-N-aryl amino-2-(styryl/substituted styryl)-1H-imidazole-5(4H)-one compounds with good yields. The main advantages of this method are short reaction time, easy workup and good yields.

  Keywords: [BMIM]BF4, Schiff base, One-pot reaction; 1H-imidazole-5(4H)-ones

• Electrochemical studies on the corrosion resistance of 18 k gold in artificial saliva, in the absence and presence of gemer-2 tablet (orally taken by type 2 diabetes)349-354en [517.23 kB - PDF]EPA-02286-00091-0030

  The corrosion resistance of 18 K gold in artificial saliva, in the absence and presence of Gemer-2 Tablet (orally taken by type 2 Diabetes) has been evaluated by polarization study and AC impedance spectra. Polarisation study reveals that in the presence of Gemer-2, LPR value increases and corrosion current decreases. That is in presence of Gemer-2, the corrosion resistance of 18K Gold in artificial saliva increases. AC impedance study reveals that in the presence of Gemer-2, Rt value increases and Cdl decreases. That is in the presence of Gemer-2 the corrosion resistance of 18 K Gold in AS increases. It is concluded that people clipped with orthodontic wire made of 18K Gold need not hesitate to take Gemer-2 orally.

  Keywords: biomaterial; artificial saliva; corrosion resistance; Gold, Gemer-2 tablet; electrochemical studies