N. El-Rayyes
1973
Citations
0
Influential Citations
6
Citations
Journal
Journal Fur Praktische Chemie-chemiker-zeitung
Abstract
The condensation of methyl-2-thienyl-, and phenyl-2-thienyl-ketones with dimethyl succinate in the presence of potassium t-butoxide or sodium hydride gave predominantly the (E)-half-esters11a and 1d, which were cyclised to benzothiophene derivatives 2a and 2e, respectively. Methanolysis of the derived anhydrides 3a and 3 b led to the formation of the half-esters 1c and 1f. The (E)-dibasic acids 1b and 1e were converted by concentrated sulphuric acid to the lactones 4a and 4b. The methoxy-acid 2h gave upon such treatment the fluorenone derivative 5.