Synthesis of 2-Alkynyl-, 4-Alkynyl-, and 2,7-Dialkynyl-1,8-bis(dimethylamino)naphthalenes and the Unexpected Influence of ortho-Alkynyl Groups on Their Basicity
作者:Alexander Pozharskii、Ekaterina Filatova、Anna Gulevskaya、Nikolay Vistorobskii、Valery Ozeryanskii
DOI:10.1055/s-0033-1339339
日期:——
4-alkynyl-, and 2,7-dialkynyl derivatives of 1,8-bis(dimethylamino)naphthalene (‘proton sponge’) have been synthesized and their basicity values have been measured by competitive NMR studies in DMSO. These indicate that, while the para-alkynyl groups decrease the basicity of the parent proton sponge approximately by one order of magnitude in accordance with their electron-accepting nature, the influence
合成了 1,8-双(二甲氨基)萘(“质子海绵”)的新型 2-炔基-、4-炔基-和 2,7-二炔基衍生物,并通过 DMSO 中的竞争性核磁共振研究测量了它们的碱度值. 这些表明,虽然对炔基根据其电子接受性质将母质子海绵的碱性降低了大约一个数量级,但邻炔基官能团的影响出人意料地增强了碱。后一种现象被归因于支撑效应的出现,但其他一些因素也可能在起作用。