Green semi-hydrogenation of alkynes by Pd@borate monolith catalysts under continuous flow.

Highlights: [•] Palladium nanoparticles immobilized onto an unconventional borate macroporous monolith. [•] Liquid-phase catalytic semi-hydrogenation reaction of substituted alkynes under continuous flow. [•] Excellent efficiency and long-term stability under mild reaction conditions. [•] No need of additives. [•] Selectivity comparable to that of the batch industrial processes. [ABSTRACT FROM AUTHOR]