Experimental and theoretical study of Zn(II) complexation with ceftriaxone

Complexation of Zn²⁺ cations with antibiotic ceftriaxone anions (Ctx^2–) has been studies by pH-metric titration at 25°С and a ionic strength of 0.1 (KNO₃). The formation of the ZnCtx complex has been revealed, and logβ(ZnCtx) = 4.45 ± 0.09 has been calculated. The computer model of the complex has been calculated by the DFT method with the use of the B3LYP hybrid functional and the LACV3P**+ basis set. According to these calculations, Zn(II) in the complex has the coordination number 4 and a nearly tetrahedral coordination sphere and is coordinated to Ctx^2– through carboxylate, β-lactam, and hydroxytriazinone oxygen atoms and the thiazole nitrogen atom. Formation of the chelate structure accounts for the high stability of the complex.     

Reactions of diols with dimethyl carbonate in the presence of W(CO)6 and Co2(CO)8

Dimethoxyalkanes and dimethyl alkanediyl biscarbonates were synthesized by reactions of diols with dimethyl carbonate in the presence of tungsten and cobalt carbonyls. Optimal reactant and catalyst ratios and reaction conditions were found to ensure selective formation of dimethoxyalkanes or dimethyl alkanediyl biscarbonates.     

Comment on the article “BiF3:Ho3+ System for Upconversion of 2-μm Laser Radiation into Visible Emission” of authors A. P. Savikin,A. S. Egorov,A. V. Budruev,and I. A. Grishin [Russian Journal of Applied Chemistry 89 (2), 337–340 (2016)]

Russian Journal of Applied Chemistry -     

Synthesis of alkyl methyl ethers and alkyl methyl carbonates by reaction of alcohols with dimethyl carbonate in the presence of tungsten and cobalt complexes

Alkyl methyl ethers and alkyl methyl carbonates were synthesized by reaction of alcohols with dimethyl carbonate in the presence of tungsten and cobalt carbonyls. Optimal reactant and catalyst ratios, as well as reaction conditions, were found for selective formation of alkyl methyl ethers or alkyl methyl carbonates.     

Ritter reaction of organic nitriles with 1-bromo- and 1-hydroxyadamantanes catalyzed by manganese compounds and complexes

Manganese compounds and complexes [MnCl₂, MnBr₂, Mn(OAc)₂, Mn(acac)₂, Mn(acac)₃, Mn₂(CO)₁₀] catalyze Ritter reaction of organic nitriles with 1-bromo- and 1-hydroxyadamantanes. The reaction proceeds in water environment in the absence of acids at 100–130°C over 3–5 h and affords N-(adamantan-1-yl)amides in 75–100% yields.     

Synthesis of 1-, 2-Methoxy-, 1,3-Dimethoxyadamantanes And 1-, 4-Methoxydiadamantanes by Reaction of Adamantyl and Diadamantyl Halides with Dimethyl Carbonate in the Presence of Zeolite Catalysts

Russian Journal of Organic Chemistry - 1-, 2-Methoxy-, 1,3-dimethoxyadamantane, and 1-, 4-methoxydiadamantane were prepared by the reaction of adamantyl and diadamantyl halides with dimethyl...     

Methylation of Aniline and Its Derivatives with Dimethyl Carbonate under the Action of Zeolite FeHY-mmm

Russian Journal of Organic Chemistry - Selective methylation of aniline and its derivatives with dimethyl carbonate under the action of binder-free micro-, macro-, and mesoporous zeolites FeHY-mmm...