Rates and mechanisms of indole and 3-Methylindole polymerization in cation exchange resin beads

Batch extraction and polymerization of indole and 3-methylindole (skatole) with acidic cation exchange resins functioned as pseudo first-order reactions. Activation energies of 3.4 and 5.7 keal/mole indicated greater steric hindrance to skatole polymerization, as would be expected from 2,2′ bonding of skatole compared to 3,2′ bonding for indole. Linear polymerization occurred, although a heterocyclic ring opened at the trimer stage of poly(indole). 2-Methylindole did not polymerize. General acid-base catalysis caused unreproducible partial depolytnerization when the polymers were extracted from resin beads. Thus, compounds chromatographically separated probably were of lower degree of polymerization than were the polymers formed in the resin matrix.     

1-Methylallyl(cyclooctatetraene)titanium

The complex 1-methylally(cyclooctatetraene)titanium has been prepared by the reaction of cyclooctatetraenetitanium chloride and 1-methylallylmagnesium bromide. The IR spectrum shows the vibrations of the h⁸-C₈H₈ ligand and of a π-bonded methylallyl group. The mass spectrum is also discussed.     

Mass spectrometry-gas chromatographic determination of mecloqualone metabolites from urine extracts

Summary The separation and identification of metabolites of mecloqualone in human urine samples by GLC-MS analysis are described. Four hydroxylated mecloqualone derivates have been identified.

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Zusammenfassung Die Trennung und Identifizierung von Metaboliten des Mecloqualons in Menschenharn durch Gas-Flüssigchromatographie und Massenspektrometrie wurde beschrieben. Vier Hydroxylderivate des Mecloqualons wurden identifiziert.

     

The eight-states ferroelectric model with geometrically coupled t1u-modes in α-indium monochloride

The InCl₆-octahedra in α-InCl are treated with an eight-states ferroelectric model, in which only one symmetry mode of t_1u-symmetry, consisting solely of Cl-dependents, is considered. The stacking problem of t_1u-distorted trigonal octahedra is translated into an energy minimum problem of other modes, which are induced by the stacking. After some refinement, two structures are found, one of which resembles α-InCl. Indium shifts from their idealized rocksalt positions can be understood from a consideration of the exchange repulsion between the polarized In-ion and its ligands.     

Determination of photopeak energy in instrumental neutron activation analysis

The precision and accuracy of the peak energy allocation in γ-ray spectrometry govern the subsequent computer processing of the data. By applying the main procedures for peak energy determination to a well-defined case, it is possible to define the minimal statistical uncertainties to be expected. The systematic bias of the energies obtained is caused mainly by changes in the total count rate. A correction can be applied based on the pulser peak. From the precision and the accuracy of the peak energy determination, the scanning width for automatic peak indexing follows.