87694-29-9

Upstream product

• 87694-30-2 8-Oxo-2-phenyl-8H-indeno<2,1-b>thiophen-3-carbonsaeure-methylester 
• 87694-19-7 methyl 3,5-diphenyl-4-methoxycarbonyl-2-thiophenecarboxylic acid 
• 87694-18-6 5-Chlorformyl-2,4-diphenylthiophen-3-carbonsaeure-methylester 

Relevant academic research and scientific papers

Sulfur Compounds in Crude Oil, II - 6,11-Dihydrodiindenothiophenes

Ring closures with 3,5-diphenyl-2,4-thiophenedicarboxylic acid and theirderivates 2 have been studied.Ring closure to the indenothiophene system 3 occurs with identical functional groups in the 2- and 4-position at the thiophene ring.The indenothiophene system 4 is the reaction product from methyl 5-chloroformyl-2,4-diphenyl-3-thiophenecarboxylate with the more reactive functional group in the 5-position at the thiophene ring.The indenothiophene 4b is the starting material for 6,11-dihydrodiindenothiophenes 5.The with truxenecontaminated parent compound 5 is also obtained from 3,5-diphenyl-2,4-thiophenedimethanol (2f) with polyphosphoric acid.

Sulfur Compounds in Crude Oil, IV. - Alkaline Cleavage of 4,5-Annulated Cyclopenta-thiophen-6-ones

2-Aryl-4-(carboxyaryl)-3-thiophenecarboxylic acids 6a - c or esters 5 are formed from 4,5-annulated methyl 2-aryl-6-oxo-6H-cyclopentathiophene-3-carboxylates 1 by cleavage of the cyclopentadienone ring with methanolic potassium hydroxide.The mechanism