An efficient reagent for synthesis of α,β-unsaturated aldehydes 3-methylthio-2-propenyl p-tolyl sulfone

Alkylation of 3-methylthio-2-propenyl p-tolyl sulfone (1) with an alkyl halide and a base (NaH or KOH-TOMAC) took place at the position α to the sulfonyl group to give optionally a mono- or dialkylated product (2 or 3), which was converted to β-monosubstituted or β,β-disubstituted α,β-unsaturated aldehyde (6 or 7), respectively, by TiCl₄-assisted hydrolysis followed by the removal of p-toluenesulfinic acid.     

Thermoluminescence from extended-chain crystals of polyethylene

Thermoluminescence (TL) has been observed in γ-irradiated extended-chain crystals of polyethylene above room temperature. The TL curve, which exhibits four peaks at 50, 90, 120, and 140°C, is different from that given by folded-chain crystals, in both shape and intensity. In particular, a shape, strong glow peak is observed at 140°C, corresponding to the melting temperature of the extended chain crystals. These results are discussed in relation to independent measurements by differential scanning calorimetry and electron spin resonance.     

Eliminierung des wechselstrompolarographischen Kapazit?tsstroms mit Hilfe des Induktors

Zusammenfassung Es wurden Untersuchungen über die Eliminierung des wechselstrompolarographischen Kapazitätsstroms mit Hilfe eines Induktors angestellt. Schaltet man einen Induktor in Serie zur Elektrolysenzelle, so wird die Spitzenhöhe vielfach erhöht. Je höher der Reversibilitätsgrad, desto ausgeprägter äußert sich der Induktoreffekt.

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Summary Investigations have been carried out on the elimination of the a. c. polarographic capacity current by means of an inductor and it has been found that by connecting a suitable inductor in series to the electrolysis cell the peak height increases several times compared with the original one. The higher the reversibility, the more distinctly appears the inductance effect.

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Herrn Prof. Dr. M. von Stackelberg zum 70. Geburtstag gewidmet.

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Ein Teil dieser Arbeit ist schon als Kurze Mitteilung [4] erschienen.     

Observations of the collision-induced dipole transitions and of a quadrupole transition for barium in krypton

For Ba perturbed by Kr, collision-induced dipole transitions 6s²¹S₀ – 6snd¹D₂ (8?n?10) have been observed. The effective oscillator strength per unit Kr density was found to be 1.8–1.0 x 10^-23 cm³. For the electric-quadrupole transition 6s²¹S₀ -6s6d¹D₂, the oscillator strength is (2.0±0.4) x 10^-6.     

A simple synthesis of dimethyl 2-pyridone-4, 5-dicarboxylate derivatives

1-Hydroxyphenyl-2-pyridone derivatives 8, 10 and 11 were easily prepared by treatment of methyl isocro-tonate derivatives 6 with base at room temperature in good yields.     

Equivalent lagrangians in large N field theories

The auxiliary field method is generalized to any O (N)-invariant theory with non-polynomial interactions. In non-supersymmetric theories, two lagrangians with and without an auxiliary field are shown to be equivalent to the leading order of the 1/N expansion. In supersymmetric theories, these two lagrangians are equivalent to all orders of the 1/N expansion. The lagrangian with an auxiliary field is solvable in the 1/N expansion.