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Abstract

Methods of stabilizing thiophene derivatives of the general formula (I) by treatment with basic compounds: ##STR00001## wherein R.sup.1 and R.sup.2 each independently represents a moiety selected from the group consisting of hydrogen, optionally substituted C.sub.1-20 alkyl groups which can contain up to 5 heteroatoms selected from the group consisting of oxygen and sulfur, optionally substituted C.sub.1-20 oxyalkyl groups which can contain up to 5 heteroatoms selected from the group consisting of oxygen and sulfur, or wherein R.sup.1 and R.sup.2 together represent a fused cyclic moiety selected from the group consisting of optionally substituted C.sub.1-20 dioxyalkylene groups and C.sub.1-20 dioxyarylene groups; and stabilized thiophene derivatives that can be prepared by such methods.

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