Kondrat’eva

Independently, Kondrat eva reported that oxazoles 7 would undergo reactions with alkenes to afford pyridine derivatives 8. 

Kondrat eva pyridine synthesis. This methodology to pyridine rings continues to be applied in total synthesis. An approach to the antitumor compound ellipticine 34 ° makes use of a Diels-Alder reaction of acrylonitrile and oxazole 32 to form pyridiyl derivative 33. Addition of methyllithium and hydrolysis transforms 33 into 34. 

The intramolecular Kondrat eva reaction was also used in an approach to the... 

Podol skii IYa, Kondrat eva EV, Shcheglov IV et al. (2002) Fullerene C60 complexed with poly(N-vinylpyrrolidone) prevents the disturbance of long-term memory consolidation. Phys Solid States. 44 552-554. 

For a review of addition of ammonia and amines to triple bonds, see Chekulaeva Kondrat eva Russ. Chem. Rev. 1965, 34, 669-680. 

Liquids. Kondrat eva (101) made an extremely interesting and important observation concerning the fluorescent lifetime of terbium and gadolinium in the compounds Tb2(S04)3 and Gd2(S04)3. It was found that in certain solutions of sulfuric acid-water the lifetimes were approximately three times as long as in aqueous solutions of the same salts. 

In another study, Kondrat eva (103) made a determination of the luminescent quantum yield of the 5D4 state of the terbium ion in aqueous solution. The method used was based upon fluorescent-lifetime measurements and had previously been used by Rinck (96) and Geisler and Hellwege (96) to determine the quantum yield of rare earths in crystals. Kondrat eva made his studies on chloride and sulfate solutions, using the electronic shutter technique of Steinhaus et al. (66). 

From the data of Hoogschagen and Gorter (104), the oscillator strength of the 5D4-+7F6 transition was obtained. By means of the Ladenburg formula, the spontaneous coefficient A46 was calculated. Using the relative-emission intensities, the rest of the A4J spontaneous-emission coefficients could be calculated. From these and a measured lifetime of 5.5 x 10 4 sec at 15°C, he calculated a quantum efficiency of 0.8 per cent. Kondrat eva concluded that the probability of radiationless transition for the trivalent terbium ion in aqueous solution is approximately two orders of magnitude greater than for the radiation transition. 

Kondrat eva and Lazeeva (108b) studied the temperature dependence of the fluorescent lifetime of the 5D4 state of terbium sulfate in H20 and... 

Bazhenov AV, Fursova TN, Bashkin IO, Antonov VE, Kondrat eva IV, Krestinin AV, Shulga YuM (2006) Fullerenes nanotubes and carbon nanostructures 14(2 3) 165 Bazhenov AV, Fursova TN, Bashkin IO, Moravskii AP, Shulga YuM (September 2008) Fullerenes Nanot Carbon Nanostmct 16(5 6) 579... 

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