New selectivities from old catalysts. Occlusion of Grubbs’ catalysts in PDMS to change their reactions
作者:M. Brett Runge、Martin T. Mwangi、Ned B. Bowden
DOI:10.1016/j.jorganchem.2006.09.022
日期:2006.12
dissolved in methylene chloride also react by olefin isomerization with occluded catalysts. Eleven examples of substrates that exhibit dual reactivity by undergoing olefin isomerization with occluded catalysts and olefin metathesis with catalysts dissolved in methylene chloride are reported. Most of these substrates have olefins with allylic phosphine oxides, carbonyls, or ethers. Control experiments demonstrate
申请人:The United States of America as represented by the Secretary of Agriculture
公开号:US07534917B1
公开(公告)日:2009-05-19
A method of producing dicarboxylic acids (e.g., α,ω dicarboxylic acids) by reacting a compound having a terminal COOH (e.g., unsaturated fatty acid such as oleic acid) and containing at least one carbon-carbon double bond with a second generation Grubbs catalyst in the absence of solvent to produce dicarboxylic acids. The method is conducted in an inert atmosphere (e.g., argon, nitrogen). The process also works well with mixed unsaturated fatty acids obtained from soybean, rapeseed, tall, and linseed oils.
COMBINED SYNTHESIS OF A NITRILE-ESTER/ACID AND OF A DIESTER/DIACID
申请人:ARKEMA FRANCE
公开号:US20160016894A1
公开(公告)日:2016-01-21
A method for the combined synthesis of a mono-unsaturated nitrile-ester(acid) and of a bi-functional carbonyl compound, wherein it includes a step including the cross metathesis mc1 of an unsaturated fatty acid/ester compound with an unsaturated nitrile compound, in which mc1 is performed with partial conversion such as to obtain and recover, separately, at least the following products: a mono-unsaturated nitrile-ester/acid and a symmetrical compound, diester or diacid respectively including a double bond located in the middle of the molecular chain of compound, and subsequently a step including the oxidation cleavage cp2 of the double bond of compound, such as to form a single type of carbonyl compound having formula R2-(CH2)n-COR′, in which R′ is H or OH, depending on the operating conditions selected for the oxidation cleavage cp2. Also, the production of monomers for the polymer industry.
A New Life For Nitrile‐Butadiene Rubber: Co‐Harnessing Metathesis And Condensation For Reincorporation Into Bio‐Based Materials
作者:Jakhongir Bekmirzaev、Malaury Simon、Sara D'Aniello、Mina Mazzeo、Sander J. Cohen‐Janes、Robert T. Mathers、Régis M. Gauvin、Christophe M. Thomas
DOI:10.1002/anie.202319414
日期:2024.3.18
A key polymer material, nitrile-butadiene rubber (NBR), is converted under mild conditions via a one-pot catalytic sequence to bio-based polyesters with highly modulable structure and properties. The overall process operates with high atom-economy, formally redistributing the NBR monomers into new difunctional monomers as well as a single valuable small molecule by-product.