Plasmachemie ¿ ein aktuelles Teilgebiet der präparativen Chemie. Bildung und Eigenschaften von Carbosilanen

Plasma chemistry is realized as the universality of reactions occurring under plasma conditions. The topic discussed in this paper is confined to the application of plasmas for preparative chemistry purposes. Plasmachemical processes are estimated promising for the synthesis of endothermic, at room temperature metastable compounds, for the generation of new species by recombination of highly excited intermediates, or for enhancement of the efficiency of "normal" reactions by temperature increase. A variety of plasmachemical reactions, some of intense technical interest, are quoted, following an arbitrary classification according to the experimen- tal methods: 1] Are discharges, especially plasma jet chemistry; 2] Glow discharges and silent discharges; 3] High frequency plasmas. Same new plasmachemical syntheses elaborated in the author's group are reported. JCF can be synthesized in good yield and high purity from C2F 3 6 and J 2 as well as other reactants in a glow discharge reaction. Amines are partially converted to nitriles in low pressure plasmas. Favourable conditions for obtaining C F in an induction plasma have been worked out. Interesting 2 4 while not yet profitable are plasmachemical processes producing H 0 from 2 2 H 0 and recovering Cl2 from HCl. 2 Problems concerning the economy of plasmachemical processes are discussed taking the hydrazine synthesis as an example.