7-Benz anthrone

It is a valuable dyestuffs intermediate. When fused with KOH, two molecules of benz-anthrone combine at the positions marked above to give a dibenzanthrone which is in itself a vat dye. Also used as an intermediate for the preparation of the valuable Caledon Jade Green. 

Reaction XIX. (a) Condensation of Anthranol Derivatives with Glycerol. (B., 44, 1666.)—This condensation gives rise to the benz-anthrones which are used as intermediates in the dye industry. The reaction may be assumed to go as follows —... 

Orange-yellow leaflets from EtOH. M.p. 273°. Sol. oonc. HgSOg with blood-red col. Dil, alk. —> yellow sd. with brilliant yellowish-green fluor. Quinoline -i- Cu bronte — benz-anthrone,... 

CijH GlNsOt 2-Cblor-6.Bzl-dinilxo-benz> anthron 7 II476. 

C27H12O %3 rhenyl-Bsl.Bz2-benzo-benz anthron 7 II520. 

K. B. Whetsel, Spectrophotometric Determination of Benz-anthrone and 2,2 -DibenanthronyI, Anal. Chem. 26, 1974, 1954. 

Benz[de]anthrone 272 A finely divided mixture of 1-naphthyl phenyl ketone (1 part) and anhydrous aluminum chloride (5 parts) is heated, with protection by a calcium chloride tube, during 0.5 h from 60° to 115°, during a further 1 h from 115° to 130°, and during a final 1 h from 130° to 150°. The cake is decomposed by dilute hydrochloric acid, and the resulting solid is filtered off and washed with alcohol and ether it then consists of moderately pure benzanthrone (yield 76%). Recrystallization from glacial acetic acid, with charcoal, affords the pure compound as pale brown needles, m.p. 167-168° (uncorr.). 

Formaldehyde, Benz-aldehyde, p-Dimethyl-amino-, m-Nitro-benzaldehyde Acetone, A cetophenone, Benzophenone, fi-Acetonaphthone, Anthrone... 

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