Zur photochemie des β-pyridinalanilins

The Schiff base, 3-pyridinal aniline was cyclized via photohydration into quinoline-3-carbaldehyde in 20% yield.     

Über ein- und zweiphasige Reduktion von γ-MnO2 durch Zimtalkohol

The reduction of γ-MnO₂ with cinnamic alcohol in xylene at 90° leads (1) to γ-MnOOH in a double phase reaction with germination if the α-MnO₂ is extremely disperse, and (2) to α-MnOOH in a strictly topotactical (single phase) reaction without germination if the γ-MnO₂ is relatively well crystallised. The hexagonality of the densest packed oxygens is not a linear function of the reduction rate but shows a discontinuity when about half of the Mn⁴⁺ are reduced, which is consistent with results of GABANO . The αMnOOH obtained by this reaction shows still the selective and asymmetric X- ray and electron reflection broadening of the reactant. Hence, the authors consider the product to possess an intergrowth structure of a Groutite matrix with statistically and layerwise distributed Manganite microdomains, according to a model proposed by DE WOLFF for α-MnO₂. The domains are supposed to have the size of one cell only in the b direction, and of a few cells in the a direction, and to be present in relatively small concentration.     

Zur struktur des dimeren β-mercaptozimtaldehyds

Attempts to prepare β-thioketoaldehydes from β-chlorovinylaldehydes and sodium sulphide lead in the case of β-chlorocinnamic aldehyde and sodium sulphide to a dimer of β-mercaptocinnamic aldehyde. ¹ The structure of the dimer was proved by means of IR-, ¹H-NMR- and ¹³C-NMR-spectroscopy and established as bicyclo-[3.3.1]-5,7-diphenyl-3-hydroxy-2-oxa-6, 9-dithia-nonene-(7).     

Die absolute Konfiguration der 3,5-Diaminohexansäure aus der β-Lysin-Mutase-Reaktion

Absolute configuration of the 3,5-diaminohexanoic acid produced in the β-lysine mutase reaction The (3S, 5S)-configuration of the 3,5-diaminohexanoic acid 3 produced by the coenzyme-B₁₂-dependent β-lysine mutase from Clostridium sticklandii has been determined by two different methods: by comparison of the ¹H-NMR.-spectrum of its δ-lactam with that of synthetic (±)-cis-and (±)-trans-4-amino-6-methyl-piperidones ( 1 and 2 ) and by chemical correlation with (+)-(6S)-6-methyl-piperidone-2 ( 9 ).     

Zur Koordination des Aluminiums im β-LiAlO2

On the Coordination of Al in β-LiAlO₂ By using ²⁷Al-NMR and the determination of the contribution of Al₂O₃ to the molar refractivities, the octahedral coordination of Al in α-LiAlO₂ respectively the tetrahedral coordination in γ-LiAlO₂ has been confirmed. For β-LiAlO₂ the results show that there only tetrahedrally coordinated Al occurs, contrary to earlier statements given in literature.     

α-Hydroxymethylen-verlängerte Aldehyde durch schonende Reduktion von Cyanhydrinen

α-Hydroxymethylene Elongated Aldehydes by Partial Reduction of Cyanohydrins After acetal-protection of the hydroxy group, a number of cyanohydrins (derived from aldehydes or ketones) were reduced and hydrolysed to afford α-hydroxyaldehydes in good yields. Other synthetically useful reactions of the intermediate α-cyano and α-formyl acetals have also been studied.     

Zur Reduktion des Phosphormolybdatniederschlages bei der colorimetrischen Phosphorbestimmung

Ohne Zusammenfassung     

Selektive Reduktion von β-Jonon und Dehydro-β-jonon mit Triphenylzinnhydrid

The application of triphenyltinhydride and of triphenyltindeuteride in specific reduction of β-jonone and dehydro-β-jonone has been investigated and the preparation of pure dihydro-β-jonone,dihydro-β-jonone-d₁, dihydro-β-jonone-d₂, and dihydro-dehydro-β-jonone described.     

Absolute Konfiguration der enantiomeren α-CyclogeraniumsäUren, α-Cyclogeraniale, α-Jonone, γ-Jonone, α-und ϵ-Carotine

By chemical correlation with manool and ambrein the absolute configurations of the enantiomeric α-cyclogeranic acids, α-cyclogeranials, α-ionones and α- and ?-carotenes have been elucidated.     

Zur Kenntnis einer modifizierten Form des β-CuNdW2O8-Typs: γ-CuTbW2O8

On a Modified Form of the β-CuNdW₂O₈ Type: γ-CuTbW₂O₈ Single crystals of γ-CuTbW₂O₈ were prepared by flux in closed copper tubes. X-ray investigations show triclinic symmetry, space group C-P1 , with a = 6.722, b = 9.831, c = 15.352 Å, α = 72.82, β = 88.53, γ = 71.76°, Z = 6. γ-CuTbW₂O₈ is closely related to β-CuNdW₂O₈. One significant difference can be seen in an alternate staggered location of Tb³⁺ ions along [110].