4 Proceedings of the Roi/al Irish A cndcmji. 



was got from p-tolyl magnesium bromide and palmitamide. Its melting- 

 point (60° C.) and properties agreed with those previously found liy Krafft 

 (7oc. cit.^. 



The plenylhydrazone of 2^-iolylpentadecyl ketone was got by dissolving 

 2 grammes of the ketone and 1 gramme of phenylhydrazine in 25 c c. of 

 absolute alcohol, and letting the mixture stand in the absence of light, with 

 occasional warming, for two days. The phenlhydrazone was filtered and 

 washed with cold alcohol. 



0'2367 g. substance gave 141 c.c. N at 20° C. and 75'8 mm.p. N = GSo. 



C,,H„N, requires N = 6-66. 



It melts at 54-55° 0., and decomposes readily into an oily substance 

 which has an odour similar to that of phenylhydrazine. 



p-Tolylpentadecyl ketone semicarbazone was obtained by dissolving 

 I'o gramme of semicarbazide hydrochloride and 1'5 gramme of sodium 

 acetate in a little water, adding 3-3 grammes of p-tolylpentadecyl ketone 

 and sufficient alcohol to jDroduce a clear solution at 60° 0. The flask was 

 allowed to stand, with occasional warming, for two days, and the mixture 

 was then filtered while hoi . The solid, which separated when the filtrate was 

 cooled, was recrystallized a few times from petroleum ether, and then from 

 alcohol. 



0-2127 g. substance gave 21 c.c. N at 24° C, and 760 mm.p. N = 11-06. 



aA.NsO requires N=lo.85. 



The semicarbazone of p-tolylpentadecyl ketone crystallizes from alcohol 

 in long, silky needles, which melt at 114-5"' C. It is insoluble in ether, cold 

 alcohol, or petroleum ether ; and is soluble in chloroform, benzene, acetone, or 

 hot alcohol. 



a-Naphthylpentadecyl Ketone C,oH,COL',5H3.,. — 12-5 grammes of palmitamide 

 were added to the G-rignard reagent prepared by dissolving 3 grammes of 

 magnesium in a solution of 26 grammes of «-bromonapthaleue in 20 c.c. of 

 ether, and the mixture was heated occasionally for three days. The reaction- 

 product was decomposed by addition of a cold solution of ammonium chloride 

 in water, extracted with ether, and freed from naphthalene by distillation of 

 the latter in a current of steam. The mixture of the ketone and unchanged 

 amide was boiled with alcoholic potash, evaporated to dryness, extracted with 

 petroleum ether, decolorized in alcoholic solution with animal charcoal, and 

 finally recrystallized several times from hot alcohol. In this way wei-e obtained 

 about li gramme of the pure ketone, which melted at 48° C. 

 0-1718 g. substance gave 0-5340 g. CO^and 0-1639 g.HjO. = 84-8, H = 10'6. 



G,,]±ii(J requires (J =86-2, H = 10-38. 



