38 research outputs found
Solvent extraction of butyl phosphates from aqueous solutions
Imperial Users onl
A Hafnium-Based Metal–Organic Framework as an Efficient and Multifunctional Catalyst for Facile CO<sub>2</sub> Fixation and Regioselective and Enantioretentive Epoxide Activation
Porous heterogeneous
catalysts play a pivotal role in the chemical
industry. Herein a new Hf-based metal–organic framework (Hf-NU-1000)
incorporating Hf<sub>6</sub> clusters is reported. It demonstrates
high catalytic efficiency for the activation of epoxides, facilitating
the quantitative chemical fixation of CO<sub>2</sub> into five-membered
cyclic carbonates under ambient conditions, rendering this material
an excellent catalyst. As a multifunctional catalyst, Hf-NU-1000 is
also efficient for other epoxide activations, leading to the regioselective
and enantioretentive formation of 1,2-bifuctionalized systems via
solvolytic nucleophilic ring opening
A Hafnium-Based Metal–Organic Framework as a Nature-Inspired Tandem Reaction Catalyst
Tandem catalytic systems, often inspired
by biological systems,
offer many advantages in the formation of highly functionalized small
molecules. Herein, a new metal–organic framework (MOF) with
porphyrinic struts and Hf<sub>6</sub> nodes is reported. This MOF
demonstrates catalytic efficacy in the tandem oxidation and functionalization
of styrene utilizing molecular oxygen as a terminal oxidant. The product,
a protected 1,2-aminoalcohol, is formed selectively and with high
efficiency using this recyclable heterogeneous catalyst. Significantly,
the unusual regioselective transformation occurs only when an Fe-decorated
Hf<sub>6</sub> node and the Fe–porphyrin strut work in concert.
This report is an example of concurrent orthogonal tandem catalysis