— 192 — 



phenylhydrazone with 0,2% cuprous chloride. By this method a yield of 

 60% skatol was obtained. The authors obtained a similar result by using 

 platinous chloride as a catalysing agent. With chloride of zinc the yield 

 was from 73 to 74%. 



Sasaki 1 ) contributes the following note on the subject of the excep- 

 tionally sensitive reaction 2 ) for skatol referred to in our last Report: The 

 concentrated sulphuric acid used in the reaction should contain a trace 

 of ferric salt, but an excess of the salt is objectionable. The most suitable 

 proportion is 0,0002% of iron as ferric salt in the sulphuric acid. Further, 

 the methyl alcohol employed must be free from aldehyde. 



*) Biochem. Zeitschr. 29 (1910), 395. Quoted from Chem. Ztg. Rep. 35 (1911), 49. 

 2 ) Comp. Report October 1910, 203. 



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