“…Most of the above DHR methods of thiophenes were also used for the reaction of furans (Equation (1) [37], Equation 3 [22], Equations (4) and (5) [40], Equation 6 [41], Equation 7 [24], Equation 12 [44], Equation 13 [45],Equation 14[46], Equation 15 [47], Equation 16 [48], Equation 17 [49], and Equation 29 [46]). The difunctionalization of 2-butylfuran was also carried out (Equation 18 In contrast to thiophenes and benzothiophenes, thienothiophene and thienofuran react in the 3position.…”