450 



13. Symm Diphenylacetone 

 (dibenzylketone). 



14. Asymm. Diphenylacetone. 



15. Triphenylacetone 1.1.2. 



16. Symm Tetraphenyl- 

 acetone '). 



17. Phenylfurylketone. 



18. Diacetyl. 



(saturated) 



0.05 



/50 

 (saturated) 



o.n 



19. Benzil. 



20. Acetyl benzoyl '). 



') Prof. Staudinger, Zurich, had the kindness to send me a small quantity of 

 this preparation. 



2) By illuminating an alcoholic solution of acetylbenzoyl in a sealed tube the 

 corresponding photoreduction product can be very easily obtained. The substance 

 consists of very fine colourless crystal needles, sparingly soluble in alcohol, and 

 is perfectly stable at the air in dry condition. For the rest the compound is quite 

 comparable with the corresponding reduction product of diacetyl (Comp. Chem. 



I 



