| http://www.w3.org/ns/prov#value | - R2 is on the average a C1 to C8 alkyl, M is an alkali metal or alkaline earth metal cation, or a mixture thereof, and n is 1 when M is an alkali metal cation and n is 2 when M is an alkaline earth metal cation; d) filtering the product of step c); and e) purifying the product of step d) in a column of activated carbon;wherein the total amount of alcohol in step c) is from about 30% to 65% by weigh
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