Potassium and cesium thiocyanate complexes with diphenyloxa-21-crown-7: Synthesis and vibration spectra. Selective properties of dipnehyloxa-21-crown-7

Novel K and Cs complexes with diphenyloxa-21-crown-7 (2,3,5,6-dibenzo-1,4,7,10,13,16,19-heptaoxacyclo-heneicosadiene-2,5; DPO21C7) are synthesized and isolated in a solid state, and their IR spectra (4000–400 cm^–1) are studied. Only four ether O atoms of crown ether are involved in coordination. Conformation of a macrocycle in the complexes depends on the cation size. The potentiometric selectivity of diphenyloxa-21-crown-7 toward Cs⁺ ions was found to be the greatest.Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 3, 2005, pp. 163–167.Original Russian Text Copyright © 2005 by Ivanova, Dorokhov, Pyatova, Galkina, Yakshin, Tsivadze.This revised version was published online in April 2005 with a corrected cover date.This revised version was published online in April 2005 with a corrected cover date.     

3-Acetyl-2-amino-4-hydroxy-1,3-pentadienecarbonitrile:E,Z-isomerism and the ability to form chelates

The Ni acetylacetonate-catalyzed addition of acetylacetone to malononitrile was shown to afford 3-acetyl-2-amino-4-hydroxy-1,3-pentadienecarbonitrile. The diphenyl boron chelate of the latter with a -diketone-type structure was obtained.E,Z-isomerism of the chelate and the free ligand were investigated. TheZ-isomers were found to dominate in low polarity solvents.The work was supported by the Russian Foundation for Basic Research (Project No. 94-03-08964).Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1432–1435, August, 1994.     

Synthesis,thermal stability and mass spectra of 2-trihalomethyl-1,3,5-dithiazin-4-ones and their 2,3-dihydro derivatives

A method has been proposed for the synthesis of 2-trihalomethyl-1, 3,5-dithiazines based on the reaction of 1 1, -dithiols with 1, 1-dichloro- and I -chloroalkyl isocyanates. The thermal stability and mass spectra of these compounds were studied.Institute of Organic Chemistry, National Academy of Sciences of Ukraine, 252660 Kiev, Ukraine. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp, 996–1000, July, 1995. Original article submitted February 21, 1995.     

On the efficiency of driver state monitoring systems

Statistical data on road traffic and the results of laboratory studies are used to construct a mathematical model of a driver-driver state monitor-automobile-traffic system. In terms of the model, the probability of an accident resulting from the drowsy state of the driver is determined both in the absence and presence of a monitor. The model takes into account the efficiency and safety level provided by different monitoring systems, as well as psychological factors associated with the excessive reliance of drivers upon monitoring.     

Synthesis of acylketene N,N-acetals and their E,Z-isomerism

A method was proposed for the synthesis of acylketene N,N-acetals (AKA) by the action of methanol in the presence of Co²⁺ acetate on diacylketene N,N-acetals. Using¹H and¹³C NMR spectroscopy, a restrainment of the internal rotation around the C=C bond of AKA was discovered, and the influence of solvation of the dynamic equilibrium of the E- and Z-isomers was studied.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 401–407, February, 1990.     

Organoboron compounds 332. (Dialkylboryl) amidines from N,N-dialkylamidines

Conclusions We have synthesized N²-(dialkylboryl)-N¹,N¹-dialkylamidines by the reaction of N,N-dialkylamidines with (alkylthio)dialkylboranes and established the distinctive features of their IR and¹¹B NMR spectra that characterize amidines with a dialkylboryl group on the imine nitrogen.Translated from Izvestiya Akademiya Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1593–1596, July, 1977.