derivatives (salts and esters) of xanthic acids
where R is a hydrocarbon radical and R’ is a metal (salts) or a hydrocarbon radical (esters).
Xanthates (salts), unlike xanthic acids [acidic esters of dithio-carbonic acid ROC(=S)SH], are stable compounds. The xanthates of alkali metals disolve readily in water. They are generally prepared by the interaction of carbon disulfide and alcohol in the presence of an anhydrous alkali:
CS2 + ROH + NaOH → ROCSSNa
Xanthates (esters)—full esters of dithiocarbonic acid—can be obtained by alkylation:
ROCSSK + R’l → ROCSSR’ + KI
Xanthates (esters) decompose upon heating into mercaptan, car-bonyl sulfide, and an unsaturated hydrocarbon (Chugaev reaction), for example:
C2H5O—CSSCH3→ CH3SH + COS + CH2=CH2
The most valuable xanthate, cellulose xanthate, is used in the manufacture of viscose fiber. Certain xanthates (salts) are used in the flotation of sulfide ores and in the preparation of insecticides. They also serve as accelerators in the vulcanization of rubber and as preparations for the analytical determination of molybdenum.
V. N. FROSIN
Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content.
| ?Page tools | ||
|---|---|---|
|