Retarding Action of Various Aromatic Carboxylic Esters, Aromatic Carboxylates and their Salts on the Reaction between Aluminum Particles and Carbon Tetrachloride
In the previous paper it was shown that the reaction between aluminum particles and carbon tetrachloride was ionic considering the relation of the induction period with retarding agent versus their electric cocuctivity, and further-more various metallic salts of aromatic carboxylic acid have specified by their ionizing ability. Now the similar studies are carried out using various aromatic carboxylic esters, aromatic carboxylates and their salts which may ionize in the organic solvent, and the relation between the promoting action and the solubility in boiling carbon tetrachloride is checked. The outline of results may be summarized in the following: (1) The influence of water of crystalization on the induction period mainly depends upon the dehydration temperature. (2) For Series I the induction period is prolonged with the carbon number of alkyl group contained, and the order of the prolonged effect is shown as follows: aliphatic-<aromatic-. (3) For Series II the induction period is prolonged over the lower alkyl range (within their carbon number 5), but shortened over the higher alkyl range. The latter effect may be explained by steric hindrance. (4) For Series III the order of the prolonged effect is shown as follows: n-alkyl-<iso-alkyl-<aryl-, and it is recognized that the effect is greater on the appreciably soluble aromatic carboxylate than on the insoluble ones. (5) For Series IV the relation between the critical concentration of the induction period and the specific coductivity was shown that the reagent having ionizing ability in the organic solvent has a slorter induction period. The relation of induction period with regard to each metallic salt versus their solubility is similar to Series III.著者らはAl粒とCCl_4との反応においての各種類の添加物による反応系の阻害作用は導電率と密接な関係があることを認め，これらの反応がおそらくイオン的に進んでいるということを指摘した。さらに芳香族カルボン酸塩類の場合には反応性と導電率との関連性が芳香族カルボン酸の種類により異なる結果が得られることを前報で報告した。本報ではこれと関連して芳香族カルボン酸エステル類，芳香族カルボン酸アルキル化物およびその金属塩類の添加による阻害作用および沸とうCCl_4中における溶解度との関連性について報告する
