Comparison of the Catalytic Activities of Various Anhydrous Aluminum Chloride V : The Activity in the Acylation of Benzene with Acetyl Chloride or Benzoyl Chloride

摘要

The writers hitherto presumed the activity order of various AlCl_3 by two general methods, one of which is based on the shortening of the induction period of the reaction between Al particles and CCl_4 with AlCl_3, and the other is related to the co-ordination heat of AlCl_3 with various solvents.However supposing that some modification or discrepancy may be proved for the activity order or effectiveness order of the AlCl_3 catalysts which are used for each actual catalytic reaction as representative of one series among the various series AlCl_3 catalytic reaction, we have continued the comparison studies for that each actual catalytic reactions.Namely the catalytic activities of various AlCl_3 have been compared for the polymerization reaction of cetene, the alkylation reaction of benzene with cetene and the alkylation reaction of benzene with cetyl chloride.In this paper, the similar comparíson is continued for the acylation of benzene with two kinds of acyl chloride i.e. acetyl chloride and benzoyl chloride. The results obtained may be summarized in the following: -- (i) The catalytic activities of 10 sorts of AlCl_3 are presumed from the yield of respective main product of acylation reaction i.e. acetophenone or benzophenone. (ii) It seems that compact graîns of AlCl3 a catalysts having white or bright yellow colour are excellent and furthermore improved their effectiveness applying at powdered state for acylation reaction of benzene with acyl chloride. (iii) It is found that there are considerable improvement of effectiveness by addition of Al or HCl but HCl is more effectively added for acetylation reaction and whereas Al is added with better effect for benzoylation reaction. Accrding our idea we interpreted the improved effect by addition of Al and explained the difference of its effect between two acylation reactions by presuming occurence of side reaction. Moreover exsistence of maximum available quantity with Al is perceived.