1 1 4 Proceedings of the Royal Irish Academy. 



100 CCS. of boiling alcohol, was added, drop by drop, 12 c.es. of 50 per cent, 

 sodium hydroxide, and the liquid ■was kept gently boiling for about half an 

 hour. The mixture was then cooled and acidified with aleohoUc hydrochloric 

 acid. The yellow solid which was precipitated was filtered, washed with 

 water, then with a little alcohol, and purified by dissolving in acetone, and 

 reprecipitating with alcohol. It was finally recrystallised from benzene. 



0-175 substance gave 04659 CO2 and 0088 H,0 

 corresponding to C 726, H 5-58 

 Cr:H;,05 requires C 72-97:H 5'4. 



Dianisylidenc-diacdo-orcinol crystallises from benzene in orange prisms 

 which soften at 228'' C, and melt at 2.31-232-C. It is almost insoluble in 

 alcohol, and soluble in chlorofonn, hot benzene or hot acetone. The crystals 

 are coloured dark red by concentrated sulphuric acid, dissolving to a brownish- 

 red solution. An alcoholic solution of the substance gives a brown coloration 

 with feme chloride. 



lyiveratrylidene-diaceto-orcinol. 



CO . CH : CH . CeHs : (OCHsh 

 HO/\OH 



\/C0 . CH : CH . CsHs : (OCHs;, 

 CH3 



Diaceto-orcinol (4 grams) and veratric aldehyde (lOgi-ams) were dissolved 

 in lOOe.cs. of boUing alcohol, and 12 e.cs. of 50 per cent, sodium hydi-oxide 

 added gradually to the solution, which was then heated for about ten minutes. 

 The mixture was cooled and acidified with alcoholic hydrochloric acid. The 

 yellow precipitate which separated was filtered and washed with water and 

 alcohol. It was purified by washing with a small quantity of hot acetone 

 and crystallised from benzene About 2 grams of the substance were 

 obtained. 



01629 substance gave 04106 CO, and 0084 H-O 

 corresponding to C 6874, H 572 

 C„U,,08 requires C 6901, U 559. 



Biveratrylidene-diaceio-orciml crystallises from benzene in orange-yellow 

 prisms which melt at 188-189-5' C, and are almost insoluble in alcohol or 

 acetone, but soluble in chloroform or hot benzene. Ferric chloride produces 

 a deep-brown coloration in an alcoholic solution of the compound. Con- 

 centrated sulphuric acid dissolves the crystals, forming a cherry-red 

 solution. 



