Application of a CW chemical laser for remote pollution monitoring and process control

The measurement of the concentration of gaseous hydrogen fluoride in the exhaust of an aluminum plant by resonance absorption of the radiation of a cw chemical HF laser is reported. The HF concentration has been evaluated taking into account the simultaneous absorption of water vapor and carbon dioxide at the HF laser frequencies. The absorption cross sections for H₂O and CO₂ at the HF laser lines have been determined in laboratory experiments.     

Syntheses of Heterocycles by Intramolecular Acylation of Nitrile-Hydrogen Halide Adducts

Five-membered, six-membered, and seven-membered aza-, diaza-, and thiazaheterocycles can be prepared by cyclization of. ω-cyano carboxylic acid halides in the presence of hydrogen halides in aprotic solvents. Nitrile-hydrogen halide adducts occur as intermediates in this novel heterocycle synthesis of wide application. The acylating cyclizations of nitriles in protonic media, which proceed via imidic esters or amides, are not discussed.     

Über eine Spezialschar von Modulformen zweiten Grades (III)

Ohne Zusammenfassung     

Struktur des [C3H5]+-Ions im Cl(CH4)-Plasma

Analysis of collisional activation spectra proves that [C₃H₅]⁺ ions present in the chemical ionization plasma of methane, possess the allyl cation structure.