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Reactions of 3-arylpropynenitriles (ArC≡CCN) with electron-rich arenes (Ar'H, benzene and its polymethylated derivatives) under the action of aluminum bromide (AlBr 3 , 6 equiv) at room temperature for 0.5-2 h result in the stereoselective formation of 3,3-diarylpropenenitriles (Ar(Ar')C=CHCN) in yields of 20-64%, as products of mainly anti- hydroarylation of the acetylene bond. The obtained 3,3-diarylpropenenitriles in triflic acid CF 3 SO 3 H (TfOH) at room temperature for 1 h are cyclized into 3-arylindenones in yields of 55-70%.

beilstein journal of organic chemistry

AlBr<sub>3</sub>-Promoted stereoselective <i>anti-</i>hydroarylation of the acetylene bond in 3-arylpropynenitriles by electron-rich arenes: synthesis of 3,3-diarylpropenenitriles

AlBr3-Promoted stereoselective anti-hydroarylation of the acetylene bond in 3-arylpropynenitriles by electron-rich arenes: synthesis of 3,3-diarylpropenenitriles

AlBr₃-Promoted stereoselective anti-hydroarylation of the acetylene bond in 3-arylpropynenitriles by electron-rich arenes: synthesis of 3,3-diarylpropenenitriles