A chiral scandium-complex-catalyzed asymmetric inverse-electron-demand oxa-Diels-Alder reaction of o-quinone methides with fulvenes.

Title A chiral scandium-complex-catalyzed asymmetric inverse-electron-demand oxa-Diels-Alder reaction of o-quinone methides with fulvenes.
Authors J. Zhang; L. Lin; C. He; Q. Xiong; X. Liu; X. Feng
Journal Chem Commun (Camb)
DOI 10.1039/c7cc08124c
Abstract

A highly efficient asymmetric inverse-electron-demand oxa-Diels-Alder reaction of o-quinone methides with fulvenes has been realized using a chiral N,N'-dioxide/Sc(iii) complex as the catalyst. The corresponding optically active chromane derivatives were obtained in high yields with excellent dr and ee values (up to 99% yield, >19?:?1 dr and 94% ee).

Citation J. Zhang; L. Lin; C. He; Q. Xiong; X. Liu; X. Feng.A chiral scandium-complex-catalyzed asymmetric inverse-electron-demand oxa-Diels-Alder reaction of o-quinone methides with fulvenes.. Chem Commun (Camb). 2017;54(1):7477. doi:10.1039/c7cc08124c

Related Elements

Scandium

See more Scandium products. Scandium (atomic symbol: Sc, atomic number: 21) is a Block D, Group 3, Period 4 element with an atomic weight of 44.955912. The number of electrons in each of Scandium's shells is [2, 8, 9, 2] and its electron configuration is [Ar] 3d1 4s2. Scandium Bohr Model The scandium atom has a radius of 162 pm and a Van der Waals radius of 216 pm.Scandium was predicted by Dmitri Mendeleev in 1871 and actually discovered and isolated by Lars Nilson in 1879. One of the transition metals, scandium has a silvery-white appearance in its elemental form which oxidizes to yellow or pinkish upon contact with air. Elemental ScandiumIt is occasionally included in the classification of the rare earth elements. Scandium is found in concentrated amounts in the minerals euxenite, gadolinite and thortveitite however, due to the difficulties in the preparation of metallic scandium, global trade of the pure metal is very limited. The origin of the name scandium comes from the Latin word 'scandia' meaning Scandinavia.

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