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Mechanistic insight of TiCl4 catalyzed formal [3 + 3] cyclization of 1,3-bis(silyl enol ethers) with 1,3-dielectrophiles

机译:用1,3-介电针催化TiC14催化[3 + 3]的形式[3 + 3]环化的机械洞察

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The mechanism of TiCl _(4) mediated formal [3 + 3] cyclization of 1,3-bis(silyl enol ethers) with 1,3-dielectrophiles is studied at the B3LYP level of density functional theory (DFT) to rationalize the experimental regioselectivity. Methyl and trifluoromethyl substituted 1,3 dielectrophiles are studied theoretically since they show different regioselectivities. Two different mechanisms involving 1,2 and 1,4 addition of 1,3-bis(silyl enol ethers) on 1,3-dielectrophiles are studied for each dienophile. The intramolecular transition metal catalyzed and non-catalyzed dynamic shift of the silyl moiety is also studied. The structure of the 1,3 dienophile and the associated Mulliken charges are the driving forces for different regioselectivities in methyl and trifluoromethyl dienophiles.
机译:在B3LYP的密度泛函理论(DFT)的B3LYP水平下,研究了TiC1 _(4)介导的1,3-双(甲硅烷基烯醇醚)的形式[3 + 3]环化的1,3-双(甲硅烷基烯醇醚)的环化,以合理化实验区域选择性。理论上,从理论上研究了甲基和三氟甲基取代的1,3齐键,因为它们显示出不同的区域选择性。对每种辅酶综合研究,研究了涉及1,2和1,4加入1,3-双(甲硅烷基烯烯醚)的不同机制。还研究了催化的分子内过渡金属和甲硅烷基部分的非催化动态偏移。 1,3辅能力和相关的Mulliken电荷的结构是用于甲基和三氟甲基腙的不同区域选择性的驱动力。

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