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Factors Affecting the Conformational Preference and Magnetic Shielding of Isobutenylene Chains in Macrocyclic Salicylideneaniline Derivatives

机译:大环水杨基苯胺衍生物中异丁烯链构象偏爱和磁屏蔽的影响因素

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摘要

The ~1H NMR chemical shifts and X-ray crystal structures of various salicylideneaniline derivatives containing an isobutenylene (2-methylenepropane-1,3-diyl) chain were analyzed in detail.In solution,these compounds were present to some extent as syn-syn conformers with respect to the isobutenylene chain;the actual syn-syn population depended on the molecular structure,especially on the size of the macrocycle.Small substituents on the phenyl ring hardly affected the stability of the syn-syn form at all,whereas replacement of the phenyl group with a naphthalene moiety considerably destabilized the syn-syn form relative to the syn-skew form.The conformation-chemical shift relationship was validly maintained irrespective of the subsituent,provided the conformational preference was correctly taken into account.
机译:详细分析了各种含异丁烯(2-亚甲基丙烷-1,3-二基)链的水杨基苯胺衍生物的〜1H NMR化学位移和X射线晶体结构。在溶液中,这些化合物在一定程度上以顺合成形式存在异丁烯链的构象;实际的syn-syn总数取决于分子结构,特别是取决于大环的大小。苯环上的小取代基几乎根本不影响syn-syn-syn形式的稳定性,因此取代相对于顺偏斜形式,带有萘部分的苯基大大破坏了顺顺基形式。构象-化学位移关系可以有效地保持,而与取代基无关,只要正确考虑了构象偏爱。

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