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Magnetic properties and aromaticity of o-, m-, and p-benzyne

机译:邻,间和对苄基苯的磁性和芳香性

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The relative aromaticities of the three singlet benzyne isomers, 1,2-, 1,3-, and 1,4-didehydrobenzenes have been evaluated with a series of aromaticity indicators, including magnetic susceptibility anisotropies and exaltations, nucleus-independent chemical shifts (NICS), and aromatic stabilization energies (all evaluated at the DFT level), as well as valence-bond Pauling resonance energies. Most of the criteria point to the o-benzyne < m-benzyne < p-benzyne aromaticity order, whereas the relative aromaticity of each isomer with respect to benzene depends on the aromaticity criterion. An additional aromaticity evaluation involved the trnsition state of the Bergman cyclization of (Z)-hexa-1,5-diyn-3-ene which yields p-benzyne. Dissected NICS calculations reveal an aromatic transition state with a larger total NICS but a smaller NICS(pi) component and thus lower aromaticity than benzene.
机译:已经用一系列芳香性指标评估了三种单重苯并炔异构体1,2-,1,3-和1,4-二氢苯的相对芳香性,包括磁化率各向异性和提升,原子核独立的化学位移(NICS) ),芳族稳定能(均在DFT级评估)以及价键鲍林共振能。多数标准指向邻-苄基<间-苄基<对-苄基的芳香性顺序,而每种异构体相对于苯的相对芳香性取决于芳香性标准。额外的芳香性评估涉及(Z)-hexa-1,5-diyn-3-ene的Bergman环化的过渡态,生成p-苯并ne。解剖的NICS计算表明,芳香族过渡态的NICS总量较大,但NICS(pi)成分较小,因此芳香性比苯低。

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