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- W2072631683 abstract "Macrocyclic polyether-diester compounds have been prepared by reacting oligoethylene glycols with the appropriate dimethyl esters in the presence of catalytic amounts of alkali metal methoxides. The methanol by-product was removed by molecular sieves. Product yields were improved for the preparation of all macrocyclic compounds except a compound containing a furan subcyclic group (4). Six new macrocyclic diester compounds (7-12) could only be prepared using the base catalyzed transesterification process since the acid chloride synthetic method failed or the acid chloride could not be made. The formation of compounds 5 and 6 from dimethyl 2, 6-pyridine dicarboxylate (17) and the triethylene and tetraethylene glycols proceded by way of half-transesterified intermediates. These intermediates were also observed for the base catalyzed decomposition of 5 and 6 in methanol to form the glycol and the diester 17." @default.
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- W2072631683 date "1983-07-01" @default.
- W2072631683 modified "2023-09-26" @default.
- W2072631683 title "The preparation of macrocyclic polyether-diester compounds by transesterification including the preparation of two new nitrogen containing diester-crown compounds" @default.
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- W2072631683 doi "https://doi.org/10.1002/jhet.5570200421" @default.
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