See also:

• PHTHALAZINES (benzo-orthodiazines or benzopyridazines)

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

• CHEMISTRY
• CHEMISTRY (formerly "chymistry"; Gr. xvµela; for derivation see ALCHEMY)

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
• FORMULA (Lat. diminutive of forma, shape, pattern, &c., especially used of rules of judicial procedure)

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

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 .