Some reactions of 3,4-bis(trifluoromethyl)furan and its precursor, 2,3-bis(trifluoromethyl)-7-oxabicyclohepta-2,5-diene: novel isocoumarin formation from thermal reaction of the furan with ethyl propynoate

Article abstract of DOI:10.1016/S0022-1139(00)81185-9

Thermolysis at 450 deg C of 2,3-bis(trifluoromethyl)-7-oxabicyclo<2,2,1>hepta-2,5-diene (2) gives 3,4-bis(trifluoromethyl)furan (1).Treatment of oxanorbornadiene (2) with triflic acid (in CH2Cl2 under reflux) and then with water affords a mixture of 2,3-b