and basic conditions. The secondary alcohol esters are more stable in this regard than the primary analogs, especially under basic conditions.Related to the sulfosuccinic diesters are the sulfosuccinamides, succinimides, and succinamates, which may show some advantage in stability but usually require more harsh conditions for formation. The sulfosuccinic diamide materials are pre- pared in a manner similar to that for the diesters from maleic anhydride or the free acid and a primary or secondary amine, followed by the addition of sodium bisulfite across the double bond to give materials of the general structure
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