diazeuxis

[Gr. diazeuxis. ] Music: The separation of two tetrachords by a tone; opposed to synaphe or the overlapping of tetrachords. ( Stainer & Barrett .) di-az-ő-, in compos. [Pref. di =twice, twofold, and Eng., ., azo ( te ) =nitrogen.] IMG:content-2432.png:[blocks in formation] action of aqueous ammonia on diazo-benzene per- bromide, C6H5 N2 Br3+4NH3=C6H5 N2.N+3NH,Br; also by the action of dilute alkalies on the nitroso compound of phenyl-hydrazin, C6H5N (NO) NH2. Diazo-ben zen imide is a yellow oil, insoluble in water, soluble without alteration in sulphuric and in nitric acids. By the action of zinc and hy drochloric acid on a solution of it in alcohol, it is de composed into ammonia and aniline, C6H5N3+8H' = C6H5NH2+2NH3. diazo-benzoic, a. Diazo - benzoic nitrate : Chem.: C6H4 benzoic acid in dilute nitric acid. It is slightly soluble in cold water; it crystallizes in colorle prisms, which explode violently on being heated. Boiled with water it yields meta-oxy-benzoic acid. diazo-phenol, s. Chem.: The nitrate is obtained along with ortho and para-nitro phenol by pa ing nitrous acid into an ethereal solution of phenol, C6H5OH, cooled with ice. It crystallizes in light brown needles. are disposed circularly or in rays, sometimes form- 2. Zool .: A genus of Acidia, in which the species ing one or more stilliform systems, imbedded in a horizontal gelatinous ma . dib (1), dub, s . [Connected with dip (q. v.). Cf. Gael. dubadh a pool, a pond.] A small pool of rain-water. "Hekens the loan from the crown of the causeway, as well as the duck does the midden from the adle dib ."- Ayrshire Legatees , p. 100. dib (2), s. [Etym. doubtful.] 1. Sing .: One of the small bones in the knees of a sheep, uniting the bones above and below the joint. 2. Plural : (1) A childish game, in which the players throw Chem.: Diazo compounds are derived from aromatic hydrocarbons by the substitution of two atoms of nitrogen for two atoms of hydrogen, the two atoms of nitrogen being united to each other by two bonds, forming a dyad radical (-N=N-). One of the nitrogen atoms is directly united to an aromatic hydrocarbon radical, and the other to an atom of a haloid element, as Cl, Br, or to an acid radical, as (NO3), as diazo-benzene bromide, C6HN = NBr; diazo-benzene nitrate, CBA5 N = N'NO3. Diazo compounds are obtained by the action of the vapor of nitrous acid on the salts of aromatic amido compounds, or better, by di olving the salt of the aromatic amido compound in dilute nitric acid and adding pota ium nitrite, thus C6H5NH2 HNO3+HNO3+KNO2 = C6H5 N = N-NO2+2H2O+KNO3. Diazo compounds are mostly crystalline, colorle substances, which turn brown when exposed to the air; they are soluble in water, and slightly in alcohol, and are precipitated from before you, up or down the river, as the wind serves, and their alcoholic solution by ether; they explode to angle as near as you can to the bank of the same side violently when heated and on percu ion. When boiled with water they are decomposed, yielding HNO3. When boiled with strong alcohol they yield phenol, as C6H5 N2 NO3 + H2O = C6H5OH + N2 + hydrocarbons, the alcohol being oxidized into aldehyde, C6H5 N2.HSO4 + C2H5OH H2SO4+CH3 CO-H. = C6H6 + N2 + diazo-amido, in compos. up the small bones described above, or pebbles, and catch them, first on the palm, and then on the back of the hand; called also Chuckies. (2) Money. ( Slang .)