Baeyer's reagent

Baeyer's reagent : used in organic chemistry as a qualitative test for the presence of unsaturation, such as double bonds or triple bond .

The bromine test is also able to determine the presence of unsaturation.

Baeyer's reagent is an alkaline solution of potassium permanganate, which is a powerful oxidant Reaction with double or triple bonds (-C=C- or -C≡C-) in an organic material causes the color to fade from purplish-pink to brown.

 It is a syn addition reaction.

 Aldehydes and formic acid (and formic acid esters) also give a positive test

The brown solid manganese(IV) oxide precipitates out of solution when potassium permanganate reacts with a double or triple bond.

Notes : Baeyer's reagent, named after the German organic chemist Adolf von Baeyer

aniline hydrochloride

aniline hydrochloride [ORG CHEM]C6H5NH2 HCl White crystals, although sometimes

the commercial variety has a greenish tinge;melting point 198 C; soluble in water and

ethanol; used in dye manufacture, dyeing, and printing

aniline N,N-dimethyl

aniline N,N-dimethyl See N,N-dimethylaniline

aniline dye

aniline dye [ORG CHEM] A dye derived from aniline

aniline black

aniline black [ORG CHEM] A black dye produced on certain textiles, such as cotton, by

oxidizing aniline or aniline hydrochloride

aniline C6H5NH2

aniline [ORG CHEM]C6H5NH2 An aromatic amine compound that is a pale brown liquid

at room temperature; used in the dye, pharmaceutical, and rubber industries

anilide

anilide [ORG CHEM] A compound that has the C6H5NH2 group; an example is benzanilide, C6H5NHCOC6H5.

anilazine C9H5Cl3N4

anilazine [ORG CHEM]C9H5Cl3N4 A tan solid with a melting point of 159–160 C; used

for fungal diseases of lawns, turf, and vegetable crops

anethole

anethole [ORG CHEM]C10H12O White crystals that melt at 22.5 C; very slightly soluble

in water; affected by light; odor resembles oil of anise; used in perfumes and flavors,

and as a sensitizer in color-bleaching processes in color photography

anchimeric assistance

anchimeric assistance [ORG CHEM] The participation by a neighboring group in the

rate-determining step of a reaction; most often encountered in reactions of carboca-

tion intermediates. Also known as neighboring-group participation

anatabine

anatabine [ORG CHEM]C10H12N2 An alkaloid found in tobacco

anabasine

anabasine [ORG CHEM] A colorless, liquid alkaloid extracted from the plants Anabasis

aphylla and Nicotiana glauca; boiling point is 105 C; soluble in alcohol and ether; used

as an insecticide

anagyrine

anagyrine [ORG CHEM]C15H20N2O A toxic alkaloid found in several species of Lupinus

in the western United States; acute poisoning produces nervousness, depression,

loss of muscular control, convulsions, and coma

amyl xanthate

amyl xanthate [ORG CHEM] A salt formed by replacing the hydrogen attached to the

sulfur in amylxanthic acid by a metal; used as collector agent in the flotation of

certain minerals

amyl salicylate

amyl salicylate [ORG CHEM]C6H4OHCOOC5H11 A clear liquid that occasionally has a

yellow tinge; boils at 280 C; soluble in alcohol, insoluble in water; used in soap and

perfumes. Also known as isoamyl salicylate

amyl nitrite

amyl nitrite [ORG CHEM] (CH3)2CH(CH2)2NO2 A yellow liquid; soluble in alcohol, very

slightly soluble in water; fruity odor; it is flammable and the vapor is explosive; used

in medicine and perfumes. Also known as isoamyl nitrite

amyl propionate

amyl propionate [ORG CHEM]CH3CH2COOC5H11 A colorless liquid with an applelike

odor and a distillation range of 135–175 C; used in perfumes, lacquers, and flavors

amyl nitrate

amyl nitrate [ORG CHEM]C5H11ONO2 An ester of amyl alcohol added to diesel fuel to

raise the cetane number

amyl mercaptan

amyl mercaptan [ORG CHEM]C5H11SH A colorless to light yellow liquid with a boiling

range of 104–130 C; soluble in alcohol; used in odorant for detecting gas line leaks

amyl ether

amyl ether [ORG CHEM] 1. Either of two isomeric compounds, n-amyl ether or isoamyl

ether; both may be represented by the formula (C5H11)2O. 2. A mixture mainly of

isoamyl ether and n-amyl ether formed in preparation of amyl alcohols from amyl

chloride; very slightly soluble in water; used mainly as a solvent