Synthesis and Stable-Ion Studies of Regioisomeric Acetylnitropyrenes and Nitropyrenyl Carbinols and GIAO-DFT Study of Nitro Substituent Effects on α-Pyrenyl Carbocations
作者:Kenneth K. Laali、Maria A. Arrica、Takao Okazaki、Scott D. Bunge
DOI:10.1002/ejoc.200800849
日期:2008.12
hexahydropyrene through nitration/aromatization/reduction or aromatization/nitration/reduction sequences. The molecular structures of 4-acetyl-3-nitropyrene and 1-(6-nitropyren-1-yl)ethanol were established by X-ray analysis. Tetrahydropyrene was the starting point for the synthesis of isomeric nitro-2-acetylpyrenes. Low-temperature protonation of 1-acetyl-8-nitropyrene, 4-acetyl-3-nitropyrene, and
几种区域异构乙酰硝基芘由异构乙酰芘通过温和的质子硝化合成。1-乙酰芘硝化生成3-、6-和8-硝基衍生物(8-硝基为主要异构体),从中生成相应的甲醇[NO2-Py-CH(OH)CH3; Py=芘]被合成。通过从六氢芘开始,通过硝化/芳构化/还原或芳构化/硝化/还原序列合成异构 4-乙酰硝基芘及其相应的甲醇。4-乙酰基-3-硝基芘和1-(6-硝基芘-1-基)乙醇的分子结构通过X射线分析确定。四氢芘是合成异构硝基-2-乙酰芘的起点。1-乙酰基-8-硝基芘、4-乙酰基-3-硝基芘的低温质子化、和 2-乙酰-6-硝基芘在 FSO3H/SO2ClF 或 FSO3H/SbF5 (1:1)/SO2ClF 中导致形成鎓离子(通过 C=O 和 NO2 质子化)。羰基离子中的电荷离域(芘离子特征)受羰基位置的强烈影响,其中 4-乙酰基-3-硝基芘二阳离子是最离域的。1-(3-硝基芘-4-基)乙醇的超强酸质子化产