4-Bromopyrene reacts with arylacetonitriles under LDA-mediated aryne-forming conditions to yield rearranged 5-arylmethyl-4-pyrenecarbonitriles through 4-pyryne; no simple addition products were observed. These product ratios are in accord with predictions based on the stabilities of the respective 4-pyryne (-5.55 kcal/mol) intermediates relative to benzyne, determined by AM1 molecular orbital calculations. In addition, 4-pyryne was annulated by 3-lithiated 3-cyanophthalides to dibenzo[de,qr]naphthacene-9,14-diones which were subsequently reductively dimethylated to 9,14-dimethoxydibenzo[de,qr]naphthacenes in overall good yields.
4-
溴萘在
LDA介导的
芳烃形成条件下与芳基
乙腈反应,生成重排的5-芳基甲基-4-
萘烷腈,通过4-
萘烃;未观察到简单的加成产物。这些产物的比例与基于相应的4-
萘烃中间体(-5.55 kcal/mol)相对于
苯乙炔的稳定性预测一致,稳定性是通过
AM1分子轨道计算得出的。此外,4-
萘烃与3-
锂化的3-
氰基萘二酸酯发生环化,生成二苯并[de,qr]
萘烷-9,14-二酮,随后通过还原性二甲基化反应,整体良好地生成9,14-二甲氧基二苯并[de,qr]
萘烷。