prov:value
| - .2CO.sub.3,K.sub.2CO.sub.3, KOH, NaOH, Ag.sub.2O, Ag.sub.2CO.sub.3, MgCO.sub.3, KCl, CuO, ZnCO.sub.3 or Ca(CO.sub.2CH.sub.3).sub.2.The reaction is preferably carried out in an organic solvent, for example dichloromethane, a dialkyl ether, for example diethyl ether, ethyl acetate, water or an alcohol, for example methanol or ethanol, at a temperature between 0.degree.
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