期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2014, 期 12, 页码 2533-2542出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201301844
关键词
Synthetic methods; Host-guest systems; Polycycles; Diamantane
资金
- Croatian Ministry of Science, Education and Sports [098-0982933-2911, 098-1191344-2943]
- US National Science Foundation (NSF) [CHE-1110911]
- Ben-Gurion University Research Fund for Scientific Relations
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1110911] Funding Source: National Science Foundation
New bisprimary and bisquaternary diamantane-1,6- and -4,9-diammonium/diaminium salts were synthesized, and characterized by NMR spectroscopy and X-ray crystallography. The impetus for these syntheses were previously reported X-ray crystallographic investigations of adamantane mono- and bisquaternary ammonium ions [3,5-diMeAda-1-NH3 or Ada-1,3-di(NMe3)] complexed with cucurbit[n]uril (n = 7, 8). The crystal structures were analyzed to ascertain possible structural hypotheses for high binding affinity guests bound within various diameter pumpkin-shaped hosts. Although Diam-4,9-di(NMe3I) 5 could be readily prepared from the bisprimary precursor, corresponding Diam-1,6-di(NMe3I) 14 could not be obtained even under strong reaction conditions. Stereochemical analysis of this situation suggests very severe steric non-bonding cis-1,3-diaxial type HH interactions between the axial-type NMe3 group and neighboring axial proton neighbors. These same interactions are found in Ada-2,6-di(NMe3I) analogues, but they are alleviated in this smaller polycyclic skeleton through tilting the axial C(methylene)-NMe3 bond away from its axial neighbors. However, similar structural relief for Diam-1,6-di(NMe3I) is not possible, because the C(methine)-NMe3 bond therein is ligated to the diamondoid's rigid skeleton.
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