638-53-9Relevant articles and documents
2,2':5',2''-Terthiophene-5-carboxylic Acid and 2,2':5',2''-Terthiophene-5,5''-dicarboxylic Acid
Kagan, Jacques,Arora, Sudershan K.,Uestuenol, Ayse
, p. 4076 - 4078 (1983)
2,2':5',2''-Terthiophene-5-carboxylic acid was obtained in excellent yield by treating 2,2':5',2''-terthiophene with lithium diisopropylamide, followed by carboxylation of the lithium salt with solid carbon dioxide.The 5,5''-dicarboxylic acid was obtained similarly, when 2 equiv of base were used.Attempted syntheses of the monoacid, based on the oxidation of the corresponding aldehyde or the acetyl derivative, were unsuccessful.Both the monoacid and the 5,5'-diacid sensitized the hemolysis of human erythrocytes in the presence of ultraviolet light.
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Drahowzal
, p. 767,772 (1951)
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Ruthenium-catalysed hydroxycarbonylation of olefins
Dühren, Ricarda,Kucmierczyk, Peter,Jackstell, Ralf,Franke, Robert,Beller, Matthias
, p. 2026 - 2030 (2021/04/09)
State-of-the-art catalyst systems for hydroxy- and alkoxycarbonylations of olefins make use of palladium complexes. In this work, we report a complementary ruthenium-catalysed hydroxycarbonylation of olefins applying an inexpensive Ru-precursor (Ru3(CO)12) and PCy3as a ligand. Crucial for the success of this transformation is the use of hexafluoroisopropanol (HFIP) as the solvent in the presence of an acid co-catalyst (PTSA). Overall, moderate to good yields are obtained using aliphatic olefins including the industrially relevant substrate di-isobutene. This atom-efficient catalytic transformation provides straightforward access to various carboxylic acids from unfunctionalized olefins.
Pd-Catalyzed Highly Chemo- And Regioselective Hydrocarboxylation of Terminal Alkyl Olefins with Formic Acid
Ren, Wenlong,Chu, Jianxiao,Sun, Fei,Shi, Yian
supporting information, p. 5967 - 5970 (2019/08/26)
An efficient Pd-catalyzed hydrocarboxylation of alkenes with HCOOH is described. A wide variety of linear carboxylic acids bearing various functional groups can be obtained with excellent chemo- and regioselectivities under mild reaction conditions. The reaction process is operationally simple and requires no handling of toxic CO.