Homogeneous catalysts that are recoverable by host guest interactions

Patent metadata

Field	Value
Publication number	US-10357763-B2
Application number	US-201715682991-A
Country	US
Kind code	B2
Filing date	Aug 22, 2017
Priority date	Aug 22, 2016
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

A method for separating a homogeneous catalyst from a solution includes forming a host-guest compound between a first isomer of the catalyst and inclusion compound in the solution and isolating the host-guest compound from the solution. The catalyst may be released from the inclusion compound by converting the first isomer of the catalyst to a second isomer of the catalyst.

First claim

That which is claimed is:

1. A method comprising:
separating an azobenzene-modified Grubbs homogeneous catalyst from a solution by:
(a) forming a host-guest compound between a first isomer of the catalyst and a host compound in the solution, the host compound being a cyclodextrin;
(b) isolating the host-guest compound from the solution; and
(c) releasing the catalyst from the host-guest compound by converting the first isomer of the catalyst to a second isomer of the catalyst.

2. The method of claim 1 , wherein first isomer is a cis or trans isomer and the second isomer is the other of a cis or trans isomer.

3. The method of claim 1 , wherein the catalyst includes a transition metal and an N-heterocyclic carbene moiety bonded to an azobenzene functional group.

4. The method of claim 1 , wherein the cyclodextrin is attached to a surface of a substrate.

5. The method of claim 1 , wherein the solution is an olefin metathesis reaction solution.

6. The method of claim 1 , wherein converting the first isomer of the catalyst to a second isomer of the catalyst includes applying electromagnetic radiation.

7. The method of claim 1 , wherein:
the catalyst is converted from the first isomer to the second isomer by applying electromagnetic radiation that causes the azobenzene functional group to change isomerizationan.

Assignees

• Univ Florida State Res Found

Inventors

• Chung Hoyong

Classifications

• B01J2531/821

  Ruthenium · CPC title

• C07C67/333

  by isomerisation; by change of size of the carbon skeleton (introduction or elimination of carboxyl groups C07C67/313, C07C67/32) · CPC title

• C07C209/70

  by reduction of unsaturated amines · CPC title

• C07D223/10

  attached in position 2 · CPC title

• C07C41/30

  by increasing the number of carbon atoms, e.g. by oligomerisation · CPC title