Methods of stabilizing thiophene derivatives

Details Methods of stabilizing thiophene derivatives Methods of stabilizing thiophene derivatives

2007-05-04

2008-11-11

Solola, Taofiq A (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S078000

Reexamination Certificate

active

07449588

ABSTRACT:
Methods of stabilizing thiophene derivatives of the general formula (I) by treatment with basic compounds:wherein R1and R2each independently represents a moiety selected from the group consisting of hydrogen, optionally substituted C1-20alkyl groups which can contain up to 5 heteroatoms selected from the group consisting of oxygen and sulfur, optionally substituted C1-20oxyalkyl groups which can contain up to 5 heteroatoms selected from the group consisting of oxygen and sulfur, or wherein R1and R2together represent a fused cyclic moiety selected from the group consisting of optionally substituted C1-20dioxyalkylene groups and C1-20dioxyarylene groups; and stabilized thiophene derivatives that can be prepared by such methods.

REFERENCES:
patent: 5453211 (1995-09-01), Alward
patent: 6369239 (2002-04-01), Rauchschwalbe et al.
patent: 1 142 888 (2001-10-01), None

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