Highly Regioselective and Helix-Sense Selective Living Polymerization of Phenyl and Alkoxyallene Using Chiral Nickel(II) Catalysts was written by Zhou, Li;Li, Chong-Long;Gao, Run-Tan;Kang, Shu-Ming;Xu, Lei;Xu, Xun-Hui;Liu, Na;Wu, Zong-Quan. And the article was included in Macromolecules (Washington, DC, United States) in 2021.Recommanded Product: (R)-N-((S)-2-(Diphenylphosphanyl)-1-phenylethyl)-2-methylpropane-2-sulfinamide This article mentions the following:
Facile synthesis of high optically active helical polymers from achiral monomers still remains a great challenge. In this work, two chiral Ni(II) catalysts bearing chiral R- or S-2a ligands were facilely prepared which can efficiently initiate the living/controlled polymerization of allene monomers and afford well-defined polyallenes in high yields with controlled mol. masses (Mns) and low mol. mass distributions (Mw/Mns). The catalysts showed interesting regioselectivity on the cumulated double bonds of allene monomers, as the polymerizations were highly selective which occurred on 2,3-double bonds. Moreover, the polymerization of achiral allene monomers using chiral Ni(II) catalysts showed remarkable helix-sense selectivity. The yielded polyallenes exhibited high optical activity due to the formation of a predominant one-handed helix as revealed by CD, UV-vis, and direct at. force microscopy (AFM) observations as well. The predominant one-handed helicity of the generated polyallenes was solely determined by the chirality of the Ni(II) catalysts. In the experiment, the researchers used many compounds, for example, (R)-N-((S)-2-(Diphenylphosphanyl)-1-phenylethyl)-2-methylpropane-2-sulfinamide (cas: 1803239-44-2Recommanded Product: (R)-N-((S)-2-(Diphenylphosphanyl)-1-phenylethyl)-2-methylpropane-2-sulfinamide).
(R)-N-((S)-2-(Diphenylphosphanyl)-1-phenylethyl)-2-methylpropane-2-sulfinamide (cas: 1803239-44-2) belongs to chiral phosphine ligands. Thousands of arylphosphines have been used as chiral ligands for metal-catalyzed asymmetric reactions. Effective chiral catalysts for nucleophilic phosphine catalysis are scarce, seriously limiting the development of asymmetric variants. Recommanded Product: (R)-N-((S)-2-(Diphenylphosphanyl)-1-phenylethyl)-2-methylpropane-2-sulfinamide
Referemce:
Phosphine ligand,
Chiral phosphines in nucleophilic organocatalysis