We further examined the scope of the BFRs consisting of different aromatic rings and alkyl acetate groups (Fig. ). Phenyl rings bearing both electron-donating groups including methyl, tertbutyl, and methoxy groups, and electron-withdrawing halogens all underwent the difunctionalization reaction smoothly to provide the alkenes 3ba-3bh in yields ranging from 53% to 93%. Reactions of BRFs with 1,2-diphenylethynes also occurs efficiently to produce 3bi-3bk in moderate yields, regardless of steric effect of the substrates. Furthermore, a series of BFRs with different aryl substitutions were evaluated with but-1-yn-1-ylbenzene. In general, the reaction exhibits high efficiency for the difunctionalization of the alkyne. Phenyl rings with either electrondonating or electron-withdrawing groups, naphthalene (3bv), thiophene (3bw), benzothiazole (3bx)