The Synthesis of Dihydro-2(3H)-thiophenone Derivatives
The reaction of 2,2-dimethylthiirane (4) with diethyl malonate (5) in the presence of sodium ethoxide gave 3-ethoxycarbonyl-5,5-dimethyl-dihydro-2(3H)-thiophenone (6) and a polymer.The yield of 6 could be increased to 65percent.The reaction of thiirane, 2