- Decarbonylative ether dissection by iridium pincer complexes
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A unique chain-rupturing transformation that converts an ether functionality into two hydrocarbyl units and carbon monoxide is reported, mediated by iridium(i) complexes supported by aminophenylphosphinite (NCOP) pincer ligands. The decarbonylation, which involves the cleavage of one C-C bond, one C-O bond, and two C-H bonds, along with formation of two new C-H bonds, was serendipitously discovered upon dehydrochlorination of an iridium(iii) complex containing an aza-18-crown-6 ether macrocycle. Intramolecular cleavage of macrocyclic and acyclic ethers was also found in analogous complexes featuring aza-15-crown-5 ether or bis(2-methoxyethyl)amino groups. Intermolecular decarbonylation of cyclic and linear ethers was observed when diethylaminophenylphosphinite iridium(i) dinitrogen or norbornene complexes were employed. Mechanistic studies reveal the nature of key intermediates along a pathway involving initial iridium(i)-mediated double C-H bond activation. This journal is
- Yoo, Changho,Dodge, Henry M.,Farquhar, Alexandra H.,Gardner, Kristen E.,Miller, Alexander J.M.
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p. 12130 - 12138
(2020/11/26)
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- A method of manufacturing an alkylene glycol ether (poly)
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PROBLEM TO BE SOLVED: To provide a method for producing a (poly)alkylene glycol diether, introducing the oxyalkylene groups of the optional mole number of addition and optional terminal alkyl groups by using a metallosilicate catalyst having 10 to 1,000 ratio of SiO2/M2O3as an ether interchange reaction catalyst. SOLUTION: This method for producing the (poly)alkylene glycol diether includes a process of obtaining the (poly)alkylene glycol diether by the ether interchange reaction of a first (poly)alkylene glycol monoether with a second (poly)alkylene glycol monoether in the presence of the metallosilicate catalyst having 10 to 1,000 ratio of SiO2/M2O3(wherein, M is ≥1 kind selected from the group consisting of Al, Ga, Ge, B, Zn, P, Zr, Ti, Cr, Be, V and As). COPYRIGHT: (C)2012,JPOandINPIT
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Paragraph 0058; 0059
(2016/10/17)
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