Barium complexes with crown-ether-functionalised amidinate and iminoanilide ligands for the hydrophosphination of vinylarenes
作者:Erwann Le Coz、Hanieh Roueindeji、Thierry Roisnel、Vincent Dorcet、Jean-François Carpentier、Yann Sarazin
DOI:10.1039/c9dt01512d
日期:——
The detailed multistep syntheses of two nitrogen-based sterically congested iminoanilidine and amidine proligands bearing a tethered 15-member aza-ether-crown macrocycle, namely I^Acrown}H and Amcrown}H, are reported. These proligands react with [BaN(SiMe2H)2}2·(thf)n] to generate the heteroleptic barium complexes [I^Acrown}BaN(SiMe2H)2] (5) and [Amcrown}BaN(SiMe2H)2] (6) in high yields. These
Synthesis of New <i>N</i>-Pivot Lariat Crown Ethers Containing a Propylene Linkage in the Side Arm
作者:Alan R. Katritzky、Olga V. Denisko、Sergei A. Belyakov、Otto F. Schall、George W. Gokel
DOI:10.1021/jo961098w
日期:1996.1.1
A series of new 15- and 18-membered N-pivot lariat aza-crown ethers having a propylene linkage in the side arm was prepared starting from functionalized diethanolamines and functionalized lariat aza-crown ethers containing the easily modified benzotriazole moiety. Addition reactions of such derivatives to electron-rich vinyl ethers or vinylamides followed by displacement of the benzotriazolyl group
Effect of chain length and heteroatom position on ammonium ion binding in nitrogen-containing ‘lariat’ ethers
作者:Rose Ann Schultz、Eric Schlegel、Dennis M. Dishong、George W. Gokel
DOI:10.1039/c39820000242
日期:——
Macrocuclic polyethers having polyethyleneoxy-sidechains extending from a nitrogen pivot bind ammoniumions quite strongly when an 18-memebered ring and a two-oxygen sidechain are present; a 15-memebered ring and other chainlengths give inferior binding.
The formation of complexes between aza derivatives of crown ethers and primary alkylammonium salts. Part 1. Monoaza derivatives
作者:Martin R. Johnson、Ian O. Sutherland、Roger F. Newton
DOI:10.1039/p19790000357
日期:——
The monoaza derivatives of crown ethers form complexes with primaryalkylammonium thiocyanates analogous to those formed by the crown ethers. The n.m.r. spectra of the complexes show temperature dependence which can be analysed in terms of various types of guest exchange processes and conformational changes of the host molecules. In particular, rapid conformational changes of the host macrocycle, accompanied
Synthesis of monoazacrown ethers under phase-transfer catalysis
作者:N. G. Luk’yanenko、S. S. Basok、E. Yu. Kulygina、T. Yu. Bogashchenko、I. S. Yakovenko
DOI:10.1134/s1070428012100156
日期:2012.10
A procedure has been proposed for the synthesis of monoazacrown ethers by reaction of N-benzyldiethanolamine with oligo(ethylene glycol) bis-p-toluenesulfonates in a two-phase system aromatic hydrocarbon-50% aqueous alkali, followed by removal of the benzyl group by catalytic hydrogenolysis. The maximal yields of N-benzylaza-12-crown-4, -18-crown-6, and -21-crown-7 were achieved by adding 4-10 equiv of LiCl, BaBr2, and CsCl, respectively, to the reaction mixture, which probably indicated template effect.