Initial work was done in ether, but this led to oxygen impurities, and so more recent work involves tertiary amines or nitrogen-substituted crown ethers.
32.
Schematic animation of the template-directed synthesis of the bis-bipyridinium cyclophane / " para "-phenylene crown ether [ 2 ] catenane described in the text.
33.
Potassium superoxide can be dissolved in dimethyl sulfoxide ( facilitated by crown ethers ) and is stable as long as protons are not available.
34.
In 1976, less than ten years after the discovery of crown ether, Cram et al . developed a functionalized binapthyl crown ether that catalyze transacylation.
35.
In 1976, less than ten years after the discovery of crown ether, Cram et al . developed a functionalized binapthyl crown ether that catalyze transacylation.
36.
The Tp, Tm, trithia-9-crown-3 ( a sulfur version of a small crown ether ) and cyclopentadienyl ( "'Cp "') ligands related ligands and form related complexes.
37.
Self-assembled molecules have an advantage over crown ether and cyclodextrin in that they can capture significant larger molecules or even two molecules at the same time.
38.
"' 12-Crown-4 "', also called 1, 4, 7, 10-tetraoxacyclododecane and lithium ionophore V, is a crown ether with the formula C 8 H 16 O 4.
39.
In 1980 Yamashita et al . construct a crown ether already incorporating the anthracene units ( an anthracenophane ) and also study ion uptake vs photochemistry.
40.
The crown ether binds the aminium ion so that the labile group ( in red ) is positioned next to the reactive group ( in blue ).
