Mass Spectrometry of π-complexes of transition metals : IV. π-Cyclopentadienylirondicarbonyldichlorogermaniums

The mass spectra of C₅H₅(CO)₂FeGECl₂X (X = Cl, Me, Et, n-Pr or CH₂Ph) show very intensive rearrangement ions which are formed due to cyclopentadienyl ring migration from iron to the germanium atom or chlorine (subsituent) migration from germanium to atom.     

A study of the alkaloids of Thermopsis alterniflora

Summary 1. The epigeal part ofThermopsis alterniflora at the beginning of flowering contains 3.35% of combined alkaloids. The separation of the combined bases yielded cytisine, N-methylcytisine, pachycarpine, thermopsine, and the new alkaloid alteramine.2. The structure of 11-allyl-N-methylcytisine has been established for alteramine.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 169–174, March, 1971.     

Severine N-oxide and korsemine fromKorolkowia sewerzowii

Korsevine and the new alkaloids severine N-oxide and korsemine have been isolated from the combined alkaloids ofKorolkowia sewerzowii Regel. On the basis of the results of a study of the IR and NMR spectra of the alkaloids and also of a correlation with korseveriline and korsevine it has been established that base (I) is severine N-oxide and korsemine has the structure of korsevine 3β-D-glucopyranoside.     

(2,4-Di-(tert-butyl)-6-methylphenyl)dithiophosphorane

Use of the 2,4-di-(tert-butyl)-6-methylphenyl radical permits stabilization of the corresponding dithiophosphorane (I). The analogous diselenophosphorane could not be detected as the monomer. This compound undergoes intramolecular addition of the C-H bond of the ortho-tert-butyl group at the P=Se bond with formation of the corresponding diselenophosphonic acid (III). Intermediate selenophosphine oxide (IV) was trapped as its salt with triethylamine (V).Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1654–1656, July, 1991.     

Vergleich zwischen dem dielektrischen und dem mechanischen Relaxationsverhalten

Zusammenfassung Auf Grund theoretischer Überlegungen ist es bei der Bestimmung des Relaxationsverhaltens hochpolymerer Stoffe bei verschiedenen Beanspruchungsarten sinnvoll, zur Bestimmung der Relaxationszeiten die Maxima der Imaginärteile der elastischen Moduln und der reziproken Dielektrizitätskonstanten auszuwerten und die in Abhängigkeit von der Frequenz bei konstanter Temperatur gemessenen Dispersionskurven in die Anteile der Hauptund Nebendispersionsgebiete zu zerlegen. Durch Anwendung dieses Verfahrens auf die an Polyvinylchlorid gewonnenen Ergebnisse wird nachgewiesen, daß bei diesem Stoff die mechanisch und dielektrisch gemessenen Relaxationszeiten identisch sind und daß somit die vonThurn undWolf (1) vorgeschlagene Deutung der Unterschiede zwischen mechanischem und dielektrischem Relaxationsverhalten keine allgemeine Gültigkeit hat. Ein verbessertes Verfahren zur Bestimmung der Ultraschallgeschwindigkeit und der Ultraschalldämpfung in hochpolymeren Stoffen wird angegeben.     

Mono- and Dioses of Glycyrrhiza glabra Root

Simple sugars were isolated from the ethanol extract of Glycyrrhiza glabra L. root. The component composition of the carbohydrate fraction was established using GC-MS (gas-chromatographic separation and mass-spectrometric analysis).     

Novel synthesis of 2-oxo-3-butynoates by copper-catalyzed cross-coupling reaction of terminal alkynes and monooxalyl chloride

A general and efficient Cu(I)-catalyzed cross-coupling reaction of terminal alkynes and monooxalyl chloride for the synthesis of 2-oxo-3-butynoates and 2-oxo-3-butynoamides was developed. Readily available starting materials, the mild reaction conditions, wide functional group tolerance, and the obviation of stoichiometric organolithium or magnesium reagents combine to highlight this reaction.     

Electrochemical Hydrogenation of Substituted α-Phenylvinylphosphonic Acids: General Characteristics of the Reaction Layer and Prediction of Preparative Electrolysis Conditions

The conditions for electrochemical hydrogenation and anodic oxidation of -phenylvinylphosphonic acid and its 4-chloro- and 4-methyl-substituted derivatives on palladized platinum electrodes in aqueous sulfuric-acid solutions are found. It is shown that, in the system under study, the products of strong chemisorption are not the intermediates of the electrocatalytic hydrogenation. The reactant molecules are modeled by quantum-chemical methods in terms of the restricted Hartree–Fock approximation. The calculated charge distributions in reactant molecules are used for estimating the electrostatic components of works of approach and the orientation distributions in the reaction layer.     

Investigation on the adhesion of polymer particles to the surface of a semiconductor

In this work the role of electrostatic forces in the adhesion of particles of dielectrics to a solid surface was studied. The experiment consisted in measuring simultaneously the force of adhesion and the charges of the electric double layer arising upon contact. The measurements were made with specially developed units—a pneumatic adhesiometer and a charge-spectrometer. The objects of study were polymer powders used in electrography, whose adhesion to thin layers of selenium samples were varied by varying the illumination and were estimated by their volume resistance in the dark and in the light. The shift in the Fermi level of the selenium caused by the change in the output work is accompanied by a change in adhesion of the particles. Experiments on the separation of polymer particles and films from selenium surface on illumination revealed spectral dependence of adhesion. In accordance with the electronic theory of adhesion, the effects observed may be attributed to the change in charge density of the electric double layer.     

X-ray diffraction and spectral studies of 1-phenyl-3-methyl-4-(2′,4′-Dimethylphenylazo)-pyrazolone-5

The molecular and crystal structures of 1-phenyl-3-methyl-4-(2,4-dimethyl-phenylazo) pyrazolone-5 were determined. In the crystal the molecule exists as the hydrazone tautomer. The pyrazole ring is planar, and the substituents are practically coplanar with it. The molecule contains an intramolecular NH...O hydrogen bond that closes a practically planar six-membered ring (N...O, 2.77 (I), H...O 2.14 Å, angle at H(N(4)) hydrogen 131 °). The x-ray diffraction data agree with the spectral data and with the CNO calculation.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 816–821, June, 1985.