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- W217873732 abstract "This thesis describes host-guest complexes with the use of a biphenyl crown ether or cyclodextrin as host. Complexes between the biphenyl crown ether and salts form phenylalanine esters were studied. Butylphenylalanine ester forms only 1:1 complexes; although excess butylphenylalanine was used, it was impossible to complex both sites of the crown ether. A negative cooperativity is shown for this complex. Diesters from phenylalanine and .alpha., .omega.-n diols, n=6, 8, 10 and 12, all form 1:1 complexes with both of the sites of the crown ether occupied. These complexes also show an alternating effect: for the guest having 6 and 10 CH 2 -groups, a C 2 - symmetric complex dominates. In the complexes with 8 and 12 CH 2 -groups, a C 1 -symmetric complex are relatively more stable. Using cyclodextrin as the host molecule, the Z/E- selectivity for Wittig reactions between semistabilized ylids and aromatic aldehydes with the ability to form complexes with cyclodextrin was affected. An increase in the Z- selectivity from 57% to 92% was reached in N,N-dimethyl formamide and an increase in the E- selectivity from 67 to 80% was reached for the same Wittig reaction in ethanol. .gamma.-cyclodextrin was shown to form a water-soluble complex with C 60 upon boiling an aqueous solution of .gamma.-cyclodextrin and fullerene soot. The complexation is very selective for C 60 ; when C 70 -enriched soot was boiled with an aqueous solution of .gamma.-cyclodextrin only C 60 dissolved. The complex was identified and investigated by NMR and UV/VIS techniques. The magenta-colored complex between C 60 and .gamma.-cyclodextrin turns yellow on heating. The formation of the yellow solution is accompanied with the disappearence of the 1 H NMR signals for the cyclodextrin complex and an increase of the signals for free cyclodextrin. The monomeric C 60 -complex is reformed when the yellow solution is heated with excess .gamma.-cyclodextrin." @default.
- W217873732 created "2016-06-24" @default.
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- W217873732 date "1993-01-01" @default.
- W217873732 modified "2023-09-24" @default.
- W217873732 title "Selectivity in Host-Guest Chemistry" @default.
- W217873732 hasPublicationYear "1993" @default.
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