Interactions between alkynes and methoxy or dimethylamino groups in peri-naphthalene systems
作者:Paul C. Bell、Wolfgang Skranc、Xavier Formosa、Jane O'Leary、John D. Wallis
DOI:10.1039/b201038k
日期:2002.4.29
X-Ray studies of a series of 1-ethynyl-8-methoxynaphthalenes with varying functional groups at the alkyne terminus show only small changes in the 1,5 MeO⋯spC contact distances (2.593–2.663 Å) despite the different through-bond electron-attracting powers of the terminal substituents. Replacement of methoxy with dimethylamino led to a chemical reaction when the alkyne's activating group was a carboxylic ester. The 1,5 N⋯spC interaction between a dimethylamino group and a triphenylsilylethyne group has a 1,5 Me2N⋯spC contact distance ca. 0.12 Å longer than for the corresponding methoxy case, indicative of a primarily steric interaction.
一系列在乙炔末端具有不同官能团的1-乙炔基-8-甲氧基萘的X射线研究表明,尽管末端取代基通过键吸引电子的能力不同,1,5 MeO⋯spC接触距离仅有微小变化(2.593–2.663 Å)。当乙炔的激活基团为羧酸酯时,将甲氧基替换为二甲基氨基会导致化学反应。二甲基氨基团与三苯基硅乙炔团的1,5 N⋯spC相互作用,1,5 Me2N⋯spC接触距离约比对应的甲氧基情况长0.12 Å,表明主要为空间相互作用。