1,3-Diethynylallenes: Stable Monomers, Length-Defined Oligomers, Asymmetric Synthesis, and Optical Resolution
作者:Matthijs K. J. ter Wiel、Severin Odermatt、Patrick Schanen、Paul Seiler、François Diederich
DOI:10.1002/ejoc.200700373
日期:2007.7
due to the orthogonality of the allenic π-systems. Remarkably, even complex mixtures of stereoisomers only yield one single set of NMR signals, which underlines the low stereodifferentiation in acyclic allenoacetylenic structures. Optical resolution of DEAs represents an amazing challenge, and preliminary results on the analytical level are reported. Asymmetric synthesis by Pd-mediated SN2′-type cross-coupling