Allene bzw. Kumulene

A Straightforward Modular Approach to NLO-Activeβ-Amino Vinyl Nitrothiophenes

“…In particular, the nitro group exerts its strong electron-withdrawing power through the thiophene core and concomitantly activates olefins toward Michael-type additions . Although the amination of alkynes is a well-established industrial process for the preparation of amino vinyl compounds, most alkynes and even p -nitrophenyl acetylene react only at elevated temperatures or high pressures . Here we wish to communicate a quite general modular approach to β-amino vinyl nitrothiophenes, a class of compounds with interesting nonlinear optical properties.…”