Formation of complexes between aza derivatives of crown ethers and primary alkylammonium salts. Part 4. Diaza-18-crown-6 derivatives
作者:Leslie C. Hodgkinson、Martin R. Johnson、Stephen J. Leigh、Neil Spencer、Ian O. Sutherland、Roger F. Newton
DOI:10.1039/p19790002193
日期:——
dibenzo-18-crown-6 (9b) form strong complexes in methylene chloride with primaryalkylammonium thiocyanates. The n.m.r. spectra of these complexes show temperature dependence which can be explained in the terms of different types of guest exchange processes. The complexes of the dibenzo-18-crown-6 analogue (9b) appear to exist in one form only but the spectra of the complexes of the other 18-crown-6 analogues
Synthesis of azacrown ethers and benzocryptands by macrocyclization of podands at high concentrations of reactants
作者:M. S. Oshchepkov、V. P. Perevalov、L. G. Kuzmina、A. V. Anisimov、O. A. Fedorova
DOI:10.1007/s11172-011-0075-1
日期:2011.3
The reactions of 1,2-bis(2-Y-ethoxy)benzenes, N,N-bis(2-Y-ethyl)-N-phenylamines, or 2,6-bis(Y-methyl)pyridines (Y = I, Br, or OTs) with α,ω-polyoxaalkanediamines or diazacrown ethers in the presence or absence of alkali carbonates in a concentrated acetonitrile solution of the reactants afforded the corresponding azacrown ethers or cryptands in high yields.
that the same reaction can be carried out under atmospheric-pressure conditions with slightly lower yields. Subsequent demethylation of the bis-quaternary salts with triphenylphosphine affords N,N′-dimethyl diazacoronands in high yield.
Synthesis of formyl derivatives of benzocrown ethers containing N, S, and O heteroatoms in the macrocycle
作者:S. P. Gromov、O. A. Fedorova、A. I. Vedernikov、V. V. Samoshin、N. S. Zefirov、M. V. Alfimov
DOI:10.1007/bf00696971
日期:1995.1
A method for the synthesis of 4′-bromobenzodithia-15(18)-crown-5(6) and 4′-bromobenzodiaza-15 (18)-crown-5(6) by condensation of 3,4-di(2′-haloethoxy)bromobenzene with polyoxaalkanes containing terminal SH or NHMe groups was suggested. The method for the synthesis of formyl derivatives of benzocrowns containing N, S, and O heteroatoms in the macrocycle based on the metallation of appropriate bromo