Zur Trennung von Jodid und Perrhenat von Arsenat, Selenat und Tellurat

Ohne Zusammenfassung     

Bestimmung von Palladium und seine Trennung von Nickel, Zink und Kupfer

Ohne Zusammenfassung     

Ueber Scheidung des Quecksilbers und Palladiums von einander und von Blei, Kupfer und Wismuth

Ohne ZusammenfassungSt. Petersburg, 20. April 1886.     

Die gaschromatographische Trennung und Bestimmung von Toluol, Benzylchlorid, Benzalchlorid und der Summe von o- und p-Chlortoluol

Ohne Zusammenfassung     

Amidometallate von Lanthan und Gadolinium und Umsetzung von Lanthan,Gadolinium und Scandium mit Ammoniak

Amidometallates of Lanthanum and Gadolinium and the Conversion of Lanthanum, Gadolinium, and Scandium with Ammonia By reaction of the metals with NsNH₂ and NH₃ in the hightemperature- autoclave Na₃[La(NH₂)₆], Na₃[Gd(NH₂)₆], and Na[Gd(NH₂)₄] were prepared, but not any compound of Sc. By corresponding experiments with NH₄I only La(NH₂)₃, GdN, and ScH₂ were obtained. Na₃[La(NH₂)₆] and Na₃[Gd(NH₂)₆] are isotypic with Na₃[Y(KH₂)₆], Na[Gd(NH₂)₄] with Na[Yb((NH₂)₄]. The thermal behaviour of the prepared amides was characterized by DTA and tensimetry.     

Der enzymatische Abbau von nativer und umgefällter Zellulose,von Kunstseiden und von Chitin

Ohne Zusammenfassung     

Mikrobestimmung von Kohlenstoff und Wasserstoff,sowie von 14C,Tritium und Deuterium im Stickstoffstrom

A microanalytical method for the determination of carbon and hydrogen is described. The procedure involves the combustion of the organic substance in a stream of nitrogen and the oxidation of the decomposition products with oxygen. Halogens and sulphur are absorbed by the combustion catalyst (according to Körbl), whereas nitrogen oxides are reduced on a copper surface. The combustion products, CO₂ and H₂O are determined gravimetrically; in the case of radioactive samples they are appropriately absorbed and counted in a liquid scintillation counter. Strongly quenching singly and doubly labelled samples, which cannot be accurately counted even by modification of the counting device, give equally high radioactive yields (75% for ¹⁴C, 30% for ³H), since counting is not influenced by other gaseous impurities. Deuterium is quantitatively determined by measuring the intensity of the OD-signal at 2500 cm^?1 with an infrared spectrometer.     

Synthese von N-Methyl- und N,N-Dimethylmerucathin sowie von N-Methyl- und N,N-Dimethylpseudomerucathin aus L-Alanin

Synthesis of N-Methyl- and N,N-Dimethylmerucathine and of N-Methyl- and N,N--Dimethylpseudomerucathine Starting from L -Alanine Starting form L -alanine, N-methylmerucathine (= (3R,4S)-4-(methylamino)1-phenyl-1-penten-3-ol; (3R,4S,)- 6 ), N,N-dimethylmerucathine (= (3R,4S)-4-(dimethylamino)-1-phenyl-1-penten-3-ol; (3R,4S)- 9 ), N-methylpseudomerucathine (= (3S,4S)-4-(methylamino)-1-phenyl-1-penten-3-01; (3S,4S)-6), and N,N-dimethylpseudomerucathine (= (3S,4S)-4-(dimethylamino)-1-phenyl-1-penten-3-ol; (3S,4S)- 9 ) were synthesized. The four compounds were analyzed by HPLC and compared with a natural khat extract.     

Derivate von Tricyanmethan 1. Darstellung,Charakterisierung und Zersetzung von Chlor- und Bromtricyanmethan

Derivatives of Tricyanomethane 1. Synthesis, Characterization, and Decomposition of Chloro- and Bromotricyanomethane The title compounds X? C(CN)₃, where X is Cl and Br, are characterized by means of electron absorption, nuclear magnetic resonance, vibrational, and mass spectra. The decompositions of the two compounds in solution have been studied kinetically at 5,0 ± 0,2 °C.     

Darstellung,Isolierung und Charakterisierung von Selenan- und Tellurandisulfandiphosphonat

Preparation, isolation, and characterization of Monoseleane and Disulphane-Diphosphonate The barium salts of monoselenane and monotellurane disulphanediphosphonate are isolated in pure state for the first time. They are characterized by analytical data and i.r. spectra.     

Synthesen und Kristallstrukturanalysen von Tetraalkylphosphonium-, -arsonium- und -stiboniumtriiodiden

Syntheses and Crystal Structure Analyses of Tetraalkyl Phosphonium, Arsonium, and Stibonium Triiodides The reaction of Me₄EI (E?P, As), Me₃EtSbI, Me₂Et₂SbI, MeEt₃SbI, or Et₄SbI with I₂ in absence of solvent gives Me₄PI₃ (E?P, As), Me₃EtSbI₃, Me₂Et₂SbI₃, MeEt₃SbI₃, or Et₄SbI₃. Me₄SbI₃ is formed in a reversible reaction by addition of I₂ to (Me₄Sb)₃I₈ or by reaction of a solution of Me₄SbI in ethanol with I₂ in benzene. The crystal structures of Me₄EI₃ (E?P, Sb), and Me₃EtSbI₃ and the syntheses of the novel compounds are reported.     

Klassifizierung und Isomorphie von Vanadium-, Niob- und Tantal-Legierungen

The vanadium, niobium, and tantalum phases have been classified and their isomorphous behaviour has been studied.

1. It has been found that many vanadium and niobium compounds crystallize with the Cr₃Si structure, but just 3 compounds of tantalum have this structure.
2. The sigma phase occurs in many compounds, and commonly is homogeneous over a wide compositional range.
3. TheLaves phases mentioned in this work have a radius ratio of 1.66–1.30, which lies in the range mentioned byLaves (1956)²³ andDwight (1961)²². One could expect some moreLaves phases in these systems, such as VCo₂, VCr₂, HfNb₂, ZrNb₂, HfTa₂, TaZn2, and ZrTa₂.
4. The following structure types have more than 10 representatives: Cr₃Si, MgZn₂, W, sigma, CrSi₂, TiAl₃, MgCu₂, Mn₅Si₃, CFe₃W₃, α-Mn, E-NiSiti, AuCu₃, AlCu₂Mn, W₅Si₃, Cu₁₆Mg₆Si₇, and NaCl.

     

Darstellung,Schwingungsspektren und Kristallstrukturanalyse von Di- und Trifluor-tetramethylammonium-Salzen

Synthesis, Vibrational Spectra, and Crystal Structure Analysis of Di- and Trifluoro-tetramethylammonium Salts The tetramethylammonium salts (CH₃)₃NCH₂F⁺ ( II ), (CH₃)₃NCHF₂⁺ ( III ), and (CH₃)₃NCF₃⁺ ( IV ) were prepared by quaternation of the corresponding fluoromethylamines. III was also generated from (CH₃)₃N and Zn/CF₂Br₂/KF in acetonitrile. II , III , and IV were characterized by NMR and vibrational spectroscopy, a normal coordinate analysis being undertaken for IV . The crystal structures of the iodides of III and IV have been determined. In both cations the N? CH₃ distances are on the average ( III 1.508(2) Å; IV 1.514(5) Å) longer than the N? CF valencies ( III 1.497(4) Å; IV 1.491(6) Å).     

Darstellung und Eigenschaften von N,N-Dialkyl-allylaminoboran-Addukten und N,N-Dimethyl-aminopropylboran

Synthesis and Properties of N,N-Dialkyl-allylaminoboranes and N,N-Dimethylaminopropylborane Complexes of the type H₃B ← NR₂(CH₂CH?CH₂) (R?CH₃ I , C₂H₅ II ) are formed by reaction of Li[BH₄] with dialkylallylammonium salts. By addition of AlCl₃ I can be transformed into the chelate-stabilized N,N-dimethyl-aminopropylborane III . The i.r.-, ¹H, ¹³C-n.m.r. and mass-spectra of I – III are reported and discussed.     

Zur Bestimmung von Spuren von Sn, Sb, As, Bi und Cu in thermostabilen Legierungen auf Basis von Ni, Cr, Fe und Co und in reinen Ti-, Mg-, Al- und Fe-Metallen

Ohne Zusammenfassung     

Die papierchromatographische Abtrennung von Hydrogensulfat, Sulfat und Pyrosulfat von Hypophosphit, Phosphit, Hypophosphat und kondensierten Phosphaten

Ohne Zusammenfassung