[EN] BIFUNCTIONAL DERIVATIVES OF POLYETHYLENE GLYCOL, THEIR PREPARATION AND USE [FR] DERIVES BIFONCTIONNELS DE POLYETHYLENEGLYCOL: PREPARATION ET UTILISATION
[EN] BIFUNCTIONAL DERIVATIVES OF POLYETHYLENE GLYCOL, THEIR PREPARATION AND USE [FR] DERIVES BIFONCTIONNELS DE POLYETHYLENEGLYCOL: PREPARATION ET UTILISATION
Screwed in place: An anti‐parallel double‐helical aromatic oligoamide foldamer was shown to bind to a series of rodlikeguests of various lengths upon the winding of the duplex around the guests (see scheme). Solid‐state crystal structures of the host–guest complexes show that the two strands of the duplex undergo a relative screw motion to adjust the distance between hydrogen‐bond donors located at
Selective Monoderivatization of Propane-1,3-diamine with Acid Chlorides: ?Hexahydropyrimidine method?vs. statistic methods
作者:Christian Jentgens、Stefan Bienz、Manfred Hesse
DOI:10.1002/hlca.19970800410
日期:1997.6.30
The selective N-monoderivatization of propane-1,3-diamine (5) with carbonyl and sulfonyl chlorides via2-phenylhexahydropyrimidine (6) was compared with the direct statisticmonoderivatization. It was found that, under optimized conditions, both methods are competitive to one another, depending, however, strongly on the reactivity of the eleclrophile used. The ‘hexahydropyrimidinemethod’ is more reliable