Wolfgang H. Mueller

Modern instrumental techniques in the structure elucidation of products derived from petrochemicals.

m The use of infrared, nuclear magnetic resonance, and gas chromatography-mass spectrometry in the solution of a variety of structure-composition problems in petrochemical analysis is illustrated. The structures and stereochemistry of several sulfenyl chloride (RSCL; R = alkyl, aryl, phosphoryl, acety1thio)olefin and diolefin adducts were established using the combined techniques, especially 1 00-mc. NMR. with frequency sweep decoupling. By use of the gas chromatography-mass spectrometry method, the components of a complex allene chlorination product mixture and several thiol-unsaturate adducts are separated and analyzed “on the fly” by mass spectrometry. These data, supported by NMR and infrared, allow a complete analysis of each system.

Ethanedisulphinic anhydride and ethanedisulphinic acid

The synthesis of the anhydride of ethanedisulphinic acid from the disulphinyl chloride and the subsequent formation of the acid from the anhydride is described.