Abstract
The bulky phenols 2,6-Ad2C6H3OH (Ad=adamantyl), A, (2,6-Ph2CH)2-4-Me-C6H2OH, B, and (2,6-Tol2CH)2-4-iPr-C6H2OH, C, react with one equivalent of Et3M (M=Al, Ga), Bu2Mg and Et2Zn to afford well-defined mono-phenolate complexes (ArOMRn)m. The aluminum and gallium phenolates derived from the very bulky phenol A are likely monomeric in the solid state. The other compounds are dimeric with bridging phenolates. Crystal structures of compounds with phenols B and C display the dimeric M2O2 cores of the phenolates and illustrate some deviations for the magnesium and zinc compounds. The former possesses stabilizing Mg···C contacts with one of the flanking arene groups of the phenolate substituent, and the latter may be viewed as an intermediate between a symmetric dimer and two monomers. All compounds were characterized by 1H and 13C NMR spectroscopy, and their solution spectra are in agreement with the crystal structure data.
摘要 庞大的苯酚2,6-Ad2C6H3OH(Ad = 异戊基),A,(2,6-Ph2CH)2-4-Me-C6H2OH,B,和(2,6-Tol2CH)2-4-iPr-C6H2OH,C,与一当量的Et3M(M = Al,Ga),Bu2Mg和Et2Zn反应,形成明确定义的单酚配合物(ArOMRn)m。从非常庞大的苯酚A衍生的铝和镓酚盐在固态下可能是单体的。其他化合物是具有桥联苯酚盐的二聚体。含有苯酚B和C的化合物的晶体结构显示了苯酚盐的二聚体M2O2核,并且说明镁和锌化合物的一些偏差。前者具有稳定的Mg···C接触与苯酚取代基的一个侧面芳环基团之一,后者可以看作是对称二聚体和两个单体之间的中间体。所有化合物均通过1H和13C NMR光谱表征,并且它们的溶液光谱与晶体结构数据一致。