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在过量的4-二甲氨基吡啶存在下,丙炔酸甲酯选择性地保护表儿茶素B环的邻二羟基得新化合物1;以三乙胺为催化剂,苄氧羰基氯选择性地保护儿茶素中A环的间二羟基得化合物2.1和2的结构经1H NMR,13C NMR和MS表征.并探讨了对儿茶素B环邻二羟基的保护. 相似文献
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金属有机铁电液晶:Ⅳ.第一个手性金属中心的光学活性金属有机液晶 总被引:2,自引:0,他引:2
本文首次报道了手性金属中心的金属有机铁电液晶的合成、结构和介晶性的研究。发现在非对映异构体中,其中一个具有介晶性、另一个则全然不具有介晶性,我们从分子的构型和分子间的偶极一偶极相互作用讨论了这种奇异的现象。 相似文献
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In this paper, a novel and ideal synthetic method of the phosphorus and sulfur hybrid atom ligand is reported. The speciality of this method is that the by-products of some reactions could be used circularly as starting materials in the synthetic route. Further, we synthesized a series of organopalladium complexes containing these hybrid atom chelate ligands, among them the molecular structures of novelorganopalladium complexes Pd((i-Pr)_2-P(CH_2)_2SEt)Cl_2, Pd(Et_2P(CH_2)_2SEt)Cl_2 and Pd(Ph_2P(CH_2)_2SEt)Cl_2 were determined by using the X-ray single crystal diffraction method. We first used the organotransition metal complexes containing phosphorus and sulfur hybrid atom ligands to activate the σ-C—H bond, and researched the catalytic activity, i.e. the photochemical carbonylation of benzene was catalyzed by these palladium complexes. 相似文献
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