Journal of the American Chemical Society p. 4792 - 4797 (1987)
Update date:2022-07-30
Topics:
Grootenhuis, Peter D. J.
Eerden, Johan van
Sudhoelter, Ernst J. R.
Reinhoudt, David N.
Roos, Ad
et al.
Carbon-13 spin-lattice relaxation time measurements on three series of macrocyclic polyethers with ring sizes varying from 15 to 33 ring atoms reveal that 2,6-pyrido (1) and benzo (3) crown ethers with at least 24 ring atoms can adopt conformations in which the aromatic moiety is encapsulated by the polyether ring of the ligand.This type of intramolecular self-complexation is not observed in the case of 1,3-xylyleno crown ethers (2).A number of possible structures of self-complexed crown ethers could be generated and studied by molecular mechanics.The calculations indicate that the nature of the driving force for self-complexation of 2,6-pyrydo crown ethers is mainly electrostatic whereas van der Waals forces favor self-complexation of benzo crown ethers.
View MoreJiangxi Lanqi Fine Chemical S&T Co., Ltd.
Contact:+86-21-64891143
Address:XinJiShan Industrial Area, Zhangshu City, JiangXi Province, China
website:http://www.greenutra.cn
Contact:0086-411-39553357
Address:No. 7-1-1802, Huizhi Garden,Ocean Square,Dalian, 116033, China
QINGDAO TAOSIGN INTERNATIONAL TRADE CO.,LIMITED
Contact:+86-0532-82683616
Address:RM1402, Doublestar Seacoase 7#, No. 5 Guizhou Road, Qingdao, Shandong, China
Contact:+86-531-58668191 58668193 58668196 58661173
Address:No 55,Beixiaoxinzhuang West Street,Jinan City, Shandong Province
Xiamen Huasing Chemicals Co.Ltd.
Contact:0086-592-6228397
Address:NO.24, Xinglin North 2nd Road,Jimei district
Doi:10.3987/COM-08-S(F)80
(2009)Doi:10.1016/j.ejmech.2008.09.006
(2009)Doi:10.1021/ja01576a053
(1957)Doi:10.1016/j.bmc.2009.01.032
(2009)Doi:10.1016/0022-328X(87)85117-3
(1987)Doi:10.1016/j.jfluchem.2008.05.010
(2008)
