134391-36-9Relevant academic research and scientific papers
Cyclobutadiene Intermediates in Cycloaddition Reactions of 1-Alkynyl Sulfones with 1-Alkynylamines
Eisch, John J.,Hallenbeck, Lawrence E.,Lucarelli, Michael A.
, p. 4095 - 4096 (2007/10/02)
The initially formed product from ynamines, such as diethyl(1-propynyl)amine, and 1-alkynyl sulfones is in fact the corresponding cyclobutadiene and not the 2-sulfinyl-4-aminofuran proposed by Himbert.The formation of the cyclobutadiene ring has been established by MS, IR, and 1H NMR data, as well as by chemical trapping experiments.
