A new development in the chemistry of arenes activated toward S(N)Ar reactions by the cyclopentadienyliron (FeCp+) moiety is presented in this work. A class of diiron complexes of diphenoxybenzenes was prepared in a highly efficient and very mild fashion. Dihydroxyaromatic compounds served as dinucleophiles, allowing for the formation of the diiron complexes. This could be achieved in either a one or two step procedure. A wide variety of dinucleophiles were incorporated into this study, as well as a number of FeCp+ activated arenes. It is shown that these reactions are not inhibited by bulky substituents on either the dinucleophiles or activated arenes. The diiron complexes themselves could also undergo S(N)Ar reactions, provided that the complexed arenes contained a chlorine substituent. This allowed for the functionalization of the complexes with species that could not be introduced directly in their syntheses. The carbon nucleophiles generated from ethyl cyanoacetate or (phenylsulfonyl)acetonitrile could be attached to the complexed ethers in this manner. The FeCp+ moieties were removed easily by photolytic demetalation which allowed for the recovery of a wide range of functionalized diphenoxybenzenes. This methodology is advantageous over all those previously reported and should be a practical route to the synthesis of aromatic ethers.
Ligand-free highly effective iron/copper co-catalyzed formation of dimeric aryl ethers or sulfides
作者:Xiaoming Qu、Tingyi Li、Yan Zhu、Peng Sun、Hailong Yang、Jincheng Mao
DOI:10.1039/c1ob05155e
日期:——
Highly selective coupling of diiodoarenes with phenols or phenthiols can be performed by using a low-cost, benign character and readily available Fe/Cu catalytic system in the absence of ligands. It is noteworthy that the desired dimeric aryl ethers or sulfides could be obtained in high yields by coupling between diiodoarenes and phenols, or diphenols with aryl iodides.
HYGROMORPHIC POLYMERS AND COPOLYMERS HAVING HUMIDITY-DRIVEN MOTILITY
申请人:Government of the United States, as represented by the Secretary of the Air Force
公开号:US20170260334A1
公开(公告)日:2017-09-14
New diamine monomers bearing sulfone terminated pendant groups, as well as methods for making the same, are provided. The diamine monomers are useful toward making polyamide, polyimide, and poly(amide-imide) polymers and copolymers, which possess hygromorphic properties and demonstrate humidity driven motility.
A polyimide polymer is provided. The polyimide polymer includes a repeating unit represented by formula 1.
In formula 1, Ar is a tetravalent organic group derived from a tetracarboxylic dianhydride containing an aliphatic structure, and A includes
and at least one divalent organic group derived from an aromatic group-containing diamine other than
Bis(azobenzene) diamines and photomechanical polymers made therefrom
申请人:The United States of America, as represented by the Secretary of the Air Force
公开号:US10301430B2
公开(公告)日:2019-05-28
Bis(azo-benzene) diamine monomers and a method of synthesizing the monomers are provided. The bis(azo-benzene) diamine monomers, in combination with amine reactive monomers, form polymers, such as polyimides and copolyimides, having photomechanical and thermomechanical properties.
Hygromorphic polymers and copolymers having humidity-driven motility
申请人:Government of the United States, as represented by the Secretary of the Air Force
公开号:US10457780B2
公开(公告)日:2019-10-29
New diamine monomers bearing sulfone terminated pendant groups, as well as methods for making the same, are provided. The diamine monomers are useful toward making polyamide, polyimide, and poly(amide-imide) polymers and copolymers, which possess hygromorphic properties and demonstrate humidity driven motility.