3,4-dioxythiophene derivatives

Details 3,4-dioxythiophene derivatives 3,4-dioxythiophene derivatives

2007-02-27

2007-02-27

Lambkin, Deborah C. (Department: 1626)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

11011515

ABSTRACT:
A process for the production of 3,4-dioxythiophene compounds represented by the following formula (I),is described. In formula (I) A, B, C and D in each case independently denote a bond, optionally substituted alkylene, optionally substituted cycloalkylene, optionally substituted arylene or (O—(CR1R2)m)x, where R1and R2in each case mutually independently denote hydrogen or optionally substituted alkyl, m denotes an integer from 1 to 10 and x denotes an integer from 1 to 10, provided that at least one of the units A, B, C or D does not denote a bond. The process involves reacting a 3,4-dihydroxythiophene or the alkali metal salt thereof with the following compound,in-line-formulae description="In-line Formulae" end="lead"?TosO-A-B-C-D-OTos,in-line-formulae description="In-line Formulae" end="tail"?thus forming an intermediate 3,4-dioxythiophene diester. The intermediate 3,4-dioxythiophene diester is saponified, thus forming an intermediate 3,4-dioxythiophene dicarboxylic acid, which is then decarboxylated, thereby forming the 3,4-dioxythiophene compound represented by formula-(I).

REFERENCES:
patent: 4072693 (1978-02-01), Reinhoudt et al.
patent: 4152335 (1979-05-01), Reinhoudt et al.
patent: 5035926 (1991-07-01), Jonas et al.
patent: 5111327 (1992-05-01), Blohm et al.
patent: 6130339 (2000-10-01), Tan et al.
patent: 6683709 (2004-01-01), Mann et al.
patent: 6869696 (2005-03-01), Richter et al.
S. Scheib et al: “Synthesis and characterization of oligo- and crown ether-substituted polythiophenes—a comparative study” Journal of Materials Chemistry, Bd. 9, Nr. 9, 1999, Seiten 2139-2150, XP002317502.
T. Sone et al: “Synthesis and reductive desulfurization of crown ethers containing thiophene subunit” Bulletin of the Chemical Society of Japan, Bd. 62, Nr. 3, 1989, Seiten 838-844, XP002317503.

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