Synergistic catalysis by Brønsted acid and Pd species on a mesoporous ZSM-5 zeolite for the oxidative homocoupling of terminal alkynes†
Wenqian
Fu 
*a
and
Tiandi
Tang
*a
*a
and
Tiandi
Tang
*a
Abstract
Development of a simple and efficient catalytic system is significant for the synthesis of 1,3-diynes in organic synthesis. Herein, an acidic mesoporous ZSM-5-supported Pd catalyst (Pd@MZSM-5) was able to transform terminal alkynes into 1,3-diynes without any additive under an oxygen atmosphere. The Brønsted acid sites in the Pd@MZSM-5 catalyst could promote the adsorption of alkynes through the interaction of the C![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
C bond with the hydroxyl group, which benefits the active Pd2+ species bonding with the CC bond to form the alkynyl-palladium(II) complex. This complex underwent a reductive elimination process to form the 1,3-diyne product.
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