Synthesis, Structures, and Heterogeneous Catalytic Applications of {Co
<sup>3+</sup>
–Eu
<sup>3+</sup>
} and {Co
<sup>3+</sup>
–Tb
<sup>3+</sup>
} Heterodimetallic Coordination Polymers
作者:Girijesh Kumar、Amit Pratap Singh、Rajeev Gupta
DOI:10.1002/ejic.201000651
日期:2010.11
Two Co3+ ―Eu 3+ } and Co3+ -Tb3+ } heterodimetalliccoordinationpolymers have been synthesized by using a Co3+ -based coordination complex as the building block. Structural studies show that the lanthanide atoms are coordinated to the cobalt complex through O amide groups. This results in the generation of a one-dimensional zigzag coordinationpolymer. These coordinationpolymers have been shown
Lanthanide-based coordination polymers as promising heterogeneous catalysts for ring-opening reactions
作者:Gulshan Kumar、Girijesh Kumar、Rajeev Gupta
DOI:10.1039/c5ra26283f
日期:——
arylcarboxylic acid groups. Both coordination polymers function as reusable heterogeneous catalysts for ring-opening reactions utilizing amines, alcohols, thiols, and azides as the nucleophiles. The catalytic results illustrate an excellent control over the regioselectivity whereas a filtration test and mechanistic studies substantiate Lewis-acid catalyzed activation of the epoxide during the reaction
A cheap, non toxic, easy to prepare and easy to use supported CuO material has shown to be a very effective catalyst for the alcoholysis of epoxides giving β-alkoxyalcohols in very good yield without generating any waste. The catalyst is heterogeneous in nature and can be reused without any reactivation treatment.
Cooperative Brønsted Acid-Type Organocatalysis: Alcoholysis of Styrene Oxides
作者:Torsten Weil、Mike Kotke、Christian M. Kleiner、Peter R. Schreiner
DOI:10.1021/ol800149y
日期:2008.4.1
We present a mild and efficient method for the completely regioselective alcoholysis of styrene oxides utilizing a cooperative Bronsted acid-type organocatalytic system comprised of mandelic acid (1 mol %) and N,N'-bis-[3,5-bis-(trifluoromethyl)phenyl]-thiourea (1 mol %). Various styrene oxides are readily transformed into their corresponding beta-alkoxy alcohols in good to excellent yields at full conversion. Simple aliphatic and sterically demanding, as well as unsaturated and acid-sensitive alcohols can be employed.