Double-Helical Ag–S Rod-Based Porous Coordination Polymers with Double Activation: σ‑Active and π‑Active Functions

As
common coinage metals, silver and silver compounds have very
rich application in the organic catalytic reaction. Immobilization
of silver compounds on heterogeneous media is the most common way
used in industrial catalytic reactions. In this work, we designed
and synthesized a new heterogeneous porous silver catalyst, with in
situ-formed Ag–S rods as connecting nodes and thiosemicarbazide-functionalized
linear ligands, used in both σ- and π-catalytic transformations.
Strong Ag–S bonds bypassed the loss of noble silver elements
and inhibited the formation of nonporous silver particles which always
led to the decrease of yields in homogenous reactions. Furthermore,
various derivatives of propargylamines and phenylacetylenes were applied
as both σ and π-active substrates with moderate to good
yields.