Ryan & Cahili- — Condensation o/Aldehi/des tuilhMetbylctliylkclonc. -'-iSQ 



SviW/niary. 



1. In the presence of dilute alkali piperonal and anisaldeliyde condensed 

 respectively with raethylethyl-ketoue to form piperonylidene- and aiiisyl- 

 idene-methylethyl-ketone. 



2. By the further action of anisaldehyde on anisylidene-methylethyl- 

 ketone iu the presence of alkali di-^-methoxyphenyl-methyltetrahydropyione 

 was formed. 



i3. In the presence of alcoholic hydrochloric acid methylethyl- ketone, 

 auisylidene-methylethyl-ketone, and di-^-methoxyphenyl-methyltetrahydro- 

 pyrone condensed with excess of anisaldehyde to form in each case the same 

 substance, CagHjsOi. An analogous substance was obtained by the action of 

 piperonal on auisylidene-methylethyl-ketone. 



E-.I.A. PUOO., VOL. XXXVI, SECT. B'. \%. 2^] 



