HPLC of Formula: 52287-51-1. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine, is researched, Molecular C8H7BrO2, CAS is 52287-51-1, about Stereoselective synthesis of pentasubstituted 1,3-dienes via Ni-catalyzed reductive coupling of unsymmetrical internal alkynes. Author is Zhou, Zhijun; Chen, Jiachang; Chen, Herong; Kong, Wangqing.
The nickel-catalyzed reductive coupling of two unsym. internal alkynes overcomed the above-mentioned limitations by using a hemilabile directing group strategy to control the regioselectivity was reported. A series of synthetically challenging penta-substituted 1,3-dienes were obtained in good yields with high regio- and enantioselectivity (mostly > 20/1 rr, >90% ee).
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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics