Sodium ethyl xanthate Sodium ethyl xanthate Sodium ethyl xanthate (SEX) is an organosulfur compound with the chemical formula CHCHOCSNa. It is a pale yellow powder, which is usually obtained as the dihydrate. Sodium ethyl xanthate is used in the mining industry as a flotation agent. A closely related potassium ethyl xanthate (KEX) is obtained as the anhydrous salt. As with most xanthates, sodium ethyl xanthate can be prepared by treating sodium ethoxide with carbon disulfide: Sodium ethyl xanthate is a pale yellow powder. It is relatively stable in water at high pH if not heated. It rapidly hydrolyses at pH <9 at 25
Ethyl cyanoacetate This reactivity is similar to that of esters of malonic acid. As an example of reactivity at the nitrile, diethyl malonate is obtained from cyanoacetic acid ethyl ester by reaction with ethanol in the presence of strong acids. Heating in the presence of sodium ethoxide forms the dimeric 3-amino-2-cyano-2-pentendiaciddiethylester. Due to its functionality cyanoacetate reacts: Ethyl cyanoacetate is a building block for the synthesis of heterocycles which are used for example as drugs: Also many other functional heterocycles are in good yields accessible from ethyl cyanoacetate, such as 3-substituted coumarin derivatives. Non-cyclic products from this starting material include: Ethyl cyanoacetate