70158-52-0Relevant articles and documents
3-Dithiolthione-substituted polythiophene and its redox activities
Takemura, Ichiro,Iwasaki, Tomokazu,Takeoka, Shinji,Nishide, Hiroyuki
, p. 1482 - 1483 (2004)
We synthesized 3-dithiolthione-substituted polythiophene, poly[3-(1′,2′-dithiol-3′-thione-4′-yl)thiophene], by cyclization reaction of poly[3-bis(methoxycaronyl)methyl thiophene]. Its redox behavior and electronic states showed that the oxidation of the p
γ-methylidene-δ-valerolactones as a coupling partner for cycloaddition: Palladium-catalyzed [4 + 3] cycloaddition with nitrones
Shintani, Ryo,Murakami, Masataka,Hayashi, Tamio
, p. 12356 - 12357 (2008/03/27)
A new type of reagent, γ-methylidene-δ-valerolactones, has been devised, which acts as a four-carbon unit in a palladium-catalyzed cycloaddition reaction through the formation of a 1,4-zwitterionic species. The utility has been demonstrated in the context of stereoselective [4 + 3] cycloaddition with nitrones to provide highly functionalized 1,2-oxazepines, including the asymmetric variant with high enantioselectivity. Copyright
Chemical process
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, (2008/06/13)
An improved process for the preparation of 3-substituted thiophenes. The thiophenes are useful for the preparation of penicillins and cephalosporins. The process is for the preparation of a thiophene of formula (I): STR1 where R1 represents a carboxylic acid group, or an ester or amide thereof or a nitrile group; R2 represents a group suitable for use as an α-substituent in the side-chain of a penicillin or cephalosporin; which comprises treating under basic conditions a compound of formula (II): STR2 wherein X represents halogen or optionally functionalized hydroxyl, Y represents halogen, hydroxyl, or alkoxy; with a source of nucleophilic sulphur ionically bound to a polymeric support.
