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New crown ethers and their polymerization

Author: ZuoJiaTao
Tutor: ZhangAFang
School: Zhengzhou University
Course: Materials Science
Keywords: Williamson etherification reaction Crown ether symmetrically substituted bifunctional Asymmetrically substituted bifunctional crown ethers
CLC: O621.3
Type: Master's thesis
Year: 2009
Downloads: 47
Quote: 0
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Abstract


This paper describes the seven new bifunctional crown ether compounds synthesized by Williamson etherification reaction . First synthesized a difunctional aliphatic crown ethers : double triphenyl oxygen methyl-24 - crown-8 , followed by four symmetrically substituted the aromatic bifunctional crown ether compounds synthesized : dual aldehyde dibenzo-24 - crown-8 , bis (hydroxymethyl) dibenzo -24 - crown-8 , two - bromide diphenyl -24 - crown-8 and double-ended alkynyl diphenyl -24 - crown-8 . Among them , the use of highly diluted and template method of combining results efficiently synthesize a large number of double aldehyde diphenyl -24 - crown-8 , 10g level , and the cyclization yield higher to reach 72% . Then synthesized by the two asymmetrically substituted difunctional crown ether compounds : 4 - formyl-4 '(5' ) - (hydroxymethyl) dibenzo -24 - crown-8 and 4 - formyl - 4 '(5 ' ) - nitro- dibenzo-24 - crown-8 . Finally , double aldehyde diphenyl -24 - crown-8 and asymmetric substituted crown ethers as the basis for the study of crown ether polymer synthesis .

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