PHTHALAZINES (benzo-orthodiazines or benzopyridazines) , in organicchemistry a
See also:group of heterocyclic compounds containing the
See also:ring complex shown in
See also:formula I . They are isomeric with the cinnolines (q.v.) . The
See also:parent substance of the group, phthalazine, CBH6N2, is best obtained from the condensation of w-tetrabromorthoxylene with
See also:hydrazine (D .
See also:Gabriel, Ber., 1893, 26, p . 2210), or by the reduction of chlorphthalazine with phosphorus and hydriodic acid (Ber., 1897, p . 3024) . It possesses basic properties and forms addition products with alkyl iodides . On oxidation with alkaline potassium permanganate it yields pyridazine dicarboxylic acid .
See also:Zinc and hydrochloric acid decompose it with formation of orthoxylylene diamine . The keto-hydro derivative phthalazone, C8H6ON2, (formula II.), is obtained by condensing hydrazine with orthophthalaldehydoacid . On treatment with phosphorus oxychloride it yields a chlorphthalazine which with zinc and hydrochloric acid gives isoindole,
See also:C8H,N, and with tin and hydrochloric acid phthalimidine, C8H2ON, the second nitrogen atom being eliminated as
See also:ammonia . \I NIN I \I CO NH \/\/ N I\/\CH/N I .
Phthalazine . II . Phthalazone .
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