202 MHz 31P NMR performances

Folcher, G.; Perly, Bruno; Guerch, Guy; Labarre, Jean‐François; Sournies, François; Vidaud, Lionel

doi:10.1016/0022-2860(87)85011-1

Cited by 18 publications

(1 citation statement)

References 10 publications

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“…c Doubling-up of signals observed, with small chemical shift separation ca. 0.02−0.05 ppm, decreasing with n value (similar splitting has been observed in analogous compounds in ref , and the problem of the conformational explanation will be published elsewhere. d J P - P values calculated according to ref for AMX coupling system.…”

Section: Resultssupporting

confidence: 72%

A Regioselective Route to New Polytopic Receptors by Diaminolysis of Chlorocyclotriphosphazatriene-Containing Crown Ethers

et al. 1999

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A general strategy is reported for the facile preparation of diamino-derivatized PNP-crowns, giving access to a large range of new host molecules of different sizes, shapes, and topology. Reactions of the tetrachloro-PNP-crown precursor 1 with polymethylene-diamines 2a-h (n ) 2-6, 8, 10, 12) proceed rapidly and regioselectively via substitution reactions of Cl at the PNP-crown-forming P-atoms; the reaction is assisted by the macrocyclic 1,3-oxy(tetraethylenoxy) substituent at the N 3 P 3 ring which provides a site for the hydrogen-bond-driven assembly of reagents 1 and 2. The products belong to three different classes of polytopic receptors: lateral macrobicycles (ansa, 5ah), bola-amphiphilic tritopic bis-crowns (bino, 6a-h), and tetratopic cylindrical macrotricycles (bisbino, 8a-h). The structures of 5, 6, 8, and 10b were established by MS and 31 P NMR spectroscopy, and an X-ray crystal structure was obtained for the bis-bino 1,3-diaminopropane PNP-crown derivative 8b. Preliminary screening by a simple TLC test of the metal-cation complexing properties of the series of compounds 5, 6, and 8 revealed their capacity to bind both harder (alkali and alkaline earth) and softer (transition) metal cations, with significant affinity being displayed toward potassium and silver cations by many of the ligands studied.

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Section: Resultssupporting

confidence: 72%