Selective discrimination between the first and the second activations The strong coupling of radical electrons enables Respect to its multireference character, coupling of radical electrons,Īnd aromaticity. Is described on the basis of quantum mechanical calculations with The comparison with other known tetraradicals as well as biradicals In addition to the synthesis of P-centered tetraradicals, Furthermore, it was demonstrated that tetraradical 1 can be utilized for the activation of small molecules such as molecular Isolating a persistent P-centered singlet tetraradical, 2,6-diaza-1,3,5,7-tetraphospha- s-hydrindacene-1,3,5,7-tetrayl ( 1), in good Sites linked by an N–R unit and bridged by a benzene moiety.īy varying the size of the substituent R, we finally succeeded in We investigated the introduction of four phosphorus-based radical Starting from an s-hydrindacenyl skeleton, Herein, we describe the search for persistent phosphorus-centered Very low stability has hampered their isolation and use in small-moleculeĪctivation. Thoroughly studied, much less is known about tetraradicals, as their While main-group-element-centered biradicals have been Are important intermediates in the process of bond formationĪnd breaking.
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