| http://www.w3.org/ns/prov#value | - The reaction sequence is generally illustrated as follows: ##STR12## wherein n is zero when m is 1 and n is 1 when m is zero; and wherein Rb and Rb ' taken separately are the same or different lower alkyl, e.g. methyl, ethyl, n-propyl, i-propyl, n-butyl, t-butyl or i-butyl and Rb and Rb ' taken together form a lower alkylene group, e.g. 1,2-ethylene; 1,3-propylene; 1,3-butylene; 1,4 -butylene; and
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