Online Encyclopedia

Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.

XANTHIC ACID (xanthogenic acid)

Online Encyclopedia
Originally appearing in Volume V28, Page 881 of the 1911 Encyclopedia Britannica.
» Make a correction to this article.
» Add information or comments to this article.
Spread the word: del.icio.us del.icio.us it!

XANTHIC See also:

ACID (xanthogenic acid) , C2H5O•CS•SH, an organic acid named from the See also:Greek EavBor, yellow, in allusion to the See also:bright yellow See also:colour of its See also:copper See also:salt. The salts of this acid are formed by the See also:action of See also:carbon bisulphide on the alcoholates, or on alcoholic solutions of the See also:caustic alkalis. They react with the alkyl iodides to See also:form dialkyl See also:esters of the dithio-carbonic acid, which readily decompose into See also:mercaptans and thiocarbamic esters on treatment with See also:ammonia: C2H5O•CS•SR1+NH3=C2H5O•CS•See also:NH2+R1•SH; with the See also:alkali alcoholates they give salts of the alkyl thiocarbonic acids: C2H5O•CS•SR +CH3OK+See also:H2O= CH3O•CO•SK+C2H5OH+R•SH. See also:Ethyl xanthic at-id, C2H5O•CS•SH, is obtained by the action of dilute sulphuric acid on the See also:potassium salt at o° C. (Zeise, See also:Bern. Jahresb., 3, p. 83). It is a colourless oil which is very unstable, decomposi at 25° C. into carbon bisulphideand See also:alcohol. The potassium salt crystallizes in colourless needles and is formed by shaking carbon bisulphide with a See also:solution of caustic potash in See also:absolute alcohol. On the addition of cupric sulphate to its aqueous solution it yields a yellow precipitate of cupric xanthate. Potassium xanthate is used in See also:indigo See also:printing and also as an antidote for See also:phylloxera. Tschugaeff (Ber., 1899, 32, p.

3332) has used the xanthic ester formation for the preparation of various See also:

terpenes, the methyl ester when distilled under slightly diminished pressure decomposing, in the sense of the See also:equation, C„H2n_1.O.CS•SCH3= C„H2„_2+See also:COS+CH3SH. According to the author molecular See also:change in the See also:hydrocarbon is prevented, since no acid See also:agent is used.

End of Article: XANTHIC ACID (xanthogenic acid)

Additional information and Comments

There are no comments yet for this article.
» Add information or comments to this article.
Please link directly to this article:
Highlight the code below, right click, and select "copy." Then paste it into your website, email, or other HTML.
Site content, images, and layout Copyright © 2006 - Net Industries, worldwide.
Do not copy, download, transfer, or otherwise replicate the site content in whole or in part.

Links to articles and home page are always encouraged.

[back]
XANTHI (Turkish Eskije) 		[next]
XANTHIPPE

Site © 2006 - Net Industries