Anhydrous metal acetate and higher carboxylate prodn. - by reacting metal powder with excess acetic anhydride in presence of oxygen@ then with higher acid

摘要

In the prodn. of anhydrous divalent Pb, Co, Cu, Mn or Mg or trivalent Fe acetates (I) or the corresp. salts (II) of carboxylic acids with at least 4 C, using the (I) prepd. first, (a) the corresp. metal powder is reacted with excess acetic anhydride (III) at 80-150deg.C, with stirring and introduction of O2 or addn. of an O2 source (IV) and the resultant (I) is sepd. (b) (I) is reacted with aliphatic carboxylic acids with at least 4 C or the corresp. anhydrides in the usual way and the acetic acid (V) or (III) formed is removed from the reaction mixt. by vacuum distn. USE/ADVANTAGE - (I) and (II) can be produced easily and economically, without using costly starting materials. (I) are also useful in the prodn. of metalloxane cpds. by reaction with element alkoxides, e.g. borate, silicate and titanate esters. Stage (b) is suitable for producing salts of e.g. valeric, caprylic, undecanoic, myristic, oleic, linoleic and esp. lauric, palmitic and stearic ac