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Unsymmetric diaryl alkynes were synthesized from the palladium-catalyzed decarboxylative coupling of aryl halides and propiolic acid using a continuous flow reaction system. This flow chemistry system continuously gave the desired products in moderate to good yields, and produced less byproduct than was formed in the batch reaction.
Symmetric diarylalkynes were obtained from the decarboxylative coupling reactions of aryl bromides and propiolic acid in water solvent condition. In the presence of phase transfer surfactant C 18 H 37 N(CH 3 ) 3 Cl, the catalytic system of both Pd(PPh 3 ) 2 Cl 2 /dppb and Pd(TPPMS) 2 Cl 2 /TPPMS afforded the desired coupled products...
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