| http://www.w3.org/ns/prov#value | - rmula III ##STR18## in which R1 and R2 are as defined above, in an inert organic solvent, in the presence of an alkali metal or an alkali metal alcoholate, as a strong base, and at elevated temperature to give an alkali metal salt of the formula IV ##STR19## in which M is an alkali metal, and subsequently liberating a compound of the formula I by protolysis of a compound of the above IV, the impro
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