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• W2022741815 abstract "A new synthesis of the title crown via isoxazolo crown ether 7 and macrocyclic bis-β-eneaminoketone 10 is described. 7 can be synthesized in 14% yield by a non-template double-[3+2] cycloaddition of dinitrileoxide 5 prepared in situ from dinitropolyether 19 by dehydration with Ph–NCO and alkyne 6. The compounds 16, 17 and 18 are synthesized by the same synthetic strategy. Comparable IR and 1H NMR spectroscopic data of macrocyclic and non-cyclic compounds show, that macrocyclic conformation stabilizing effects can be ruled out. The structures of the macrocycles 1, 7, 10 and that of the Hg(II)-complex 25, synthesized by reaction of 1 with Hg(OAc)2 were established by single-crystal X-ray structure analyses. Both inter- and intramolecular hydrogen bonds are observed for the macrocyclic bis-β-eneaminoketone 10, whereas only intramolecular hydrogen bonds are formed by 1. In the Hg(II)-complex of 1 the mercury is bonded to two methylene groups. CHgC is almost linear [177(1)°], the mean HgC distance amounts to 215(1) pm. In addition to the HgC bonds, each Hg makes a short contact to a carbonyl oxygen in a neighbouring molecule in the plane perpendicular to the CHgC axis [Hg(1)O(1) = 279(1) pm, Hg(2)O(5) = 284(1) pm]." @default.
• W2022741815 created "2016-06-24" @default.
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• W2022741815 date "1998-01-01" @default.
• W2022741815 modified "2023-09-25" @default.
• W2022741815 title "Organic metal-complexes. XXI. Synthesis and structure of 3,5,15,17-tetraoxo-1,7,10,13,19,22-hexaoxa-cyclotetracosane and 2,12,14,24-tetraoxo-4,7,10,16,19,22-hexaoxa-25-mercurato-bicyclo[11.11.1]pentacosane" @default.
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• W2022741815 doi "https://doi.org/10.1002/prac.19983400207" @default.
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