Synthesis And Application Of Thienothiophene Derivatives

Thienothiophene derivatives have been well-known compounds since1886. They canwidely be used as intermediates of organic synthesis, materials chemistry, biology, medicine,and so on.The synthesis of such compounds is of theoretical value and practical significance.In the situation of energy crisis, enhanced oil recovery has become an important field andchemical flooding involving surfactants and polymers have attracted considerable attention.The3,6-dimethyl-thieno-[3,2-b] thiophene as analog aromatic parts of the crude oil was addedto the model oil and simulate their environment of crude oil to study interfacial tension,to knowthe activity of base for interfacial tension of the zwitterionic surfactant.In this thesis the crudeoil of Gudaoyiqu was selecled and its environment simulated to study the interfacial tension,with the ultimate aim to enhance oil recovery.This thesis is divided into the three sections:1. Synthesis and characterization of thienothiophene derivativesThe3,6-dimethylthieno[3,2-b]thiophene(DMTT) was prepared with2,5-dimethyl-3-hexyne-2,5-diol as a starting material and was subject to oxidation reaction. The productswere characterized by infrared spectroscopy and nuclear magnetic resonance spectra.2. The study of3,6-dimethylthieno[3,2-b]thiophene (DMTT) with simulated oilThe3,6-dimethyl-thieno-[3,2-b] thiophene(DMTT) as analog aromatic parts of the crudeoil was added to the model oil and simulate their environment of crude oil to study interfacialtension using surface tensiometer. DMTT strengthened the part of molecular structure.3. Crude oil and model oil interfacial tensionTo study the interfacial tension of two compound drivers between betaine zwitterionicsurfactant and alkali and Gudao crude oil. We can explore that a good amount of salt couldreduce the interfacial tension. Adding base elevated interfacial tension for the n-alkanes.Adding weak base reduce the interfacial tension efficaciously for crude oil, and addingcalcium ions or magnesium ions to the weak base, the interfacial tension has differentchanges.