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A new method for the direct α-alkynylation of ethers C(sp3)-H bond with terminal alkynes C(sp)-H bond is described in good yields in the presence of a pincer ligand and copper(II) ion under mild conditions. The catalytic reaction is compatible with various functional groups. Investigation of the mechanism indicates a catalytic cycle involving a radical process and the cleavage of ether C(sp3)-H bond...
A convenient and practical procedure to prepare Pd(II) metallogel as a highly efficient and recyclable catalyst for Suzuki-Miyaura coupling has been developed. Such metallogel shows highly processable and reversible responses to thermal and mechanical stimuli. The xerogel is a highly efficient (0.005mol% Pd) heterogeneous catalyst for Suzuki-Miyaura couplings with arylhalides and phenylboronic acids...
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