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PHTHALAZINES (benzo-orthodiazines or ...

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Originally appearing in Volume V21, Page 545 of the 1911 Encyclopedia Britannica.

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PHTHALAZINES (benzo-orthodiazines or benzopyridazines)

PHTHALAZINES (benzo-orthodiazines or benzopyridazines) , in organic See also:

chemistry a See also:

GROUP

group of heterocyclic compounds containing the See also:

RING (O.E. hring; a word common to Teutonic languages; and probably cognate with the Lat. circus, Gr. KtpKOS or KpLKOS, Skt'. chakra, wheel, circle, cf. also " harangue "); in art, a band of circular shape of varying sizes, made of any material and used f

ring complex shown in See also:

formula I. They are isomeric with the cinnolines (q.v.). The See also:

PARENT, SIMON NAPOLEON (1855– )

parent substance of the group, phthalazine, CBH6N2, is best obtained from the condensation of w-tetrabromorthoxylene with See also:

HYDRAZINE (DIAMIDOGEN), N2H4

hydrazine (D. See also:

GABRIEL (Heb. SKns, man of God)

Gabriel, Ber., 1893, 26, p. 2210), or by the reduction of chlorphthalazine with See also:

PHOSPHORUS (Gr. 4ws, light, sPEpety, to bear)

phosphorus and hydriodic See also:

ACID (from the Lat. root ac-, sharp; acere, to be sour)

acid (Ber., 1897, p. 3024). It possesses basic properties and forms addition products with alkyl iodides. On oxidation with alkaline See also:

POTASSIUM [symbol K (from kalium), atomic weight 39.114 0=16)]

potassium permanganate it yields pyridazine dicarboxylic acid. See also:

ZINC

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 See also:

TIN (Lat.- stannum, whence the chemical symbol " Sn "; atomic weight =117.6, 0=16)

tin and hydrochloric acid phthalimidine, C8H2ON, the second See also:

NITROGEN [symbol N., atomic weight 14.01, 0=16]

nitrogen See also:

ATOM (Gr. &rows, indivisible, from a- privative, and TE,aPfw, to cut)

atom being eliminated as See also:

AMMONIA (NH3)

ammonia. \I NIN I \I CO NH \/\/ N I\/\CH/N I.

Phthalazine. II. Phthalazone.

End of Article: PHTHALAZINES (benzo-orthodiazines or benzopyridazines)

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