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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Chloro Derivatives of Azafullerenes C59 NCl5 and Non-Classical C97 NCl21
Vitaliy Yu Markov1, Sergey I Troyanov1
1Department of Chemistry, Moscow State University, 119991, Moscow, Leninskie gory, Russia.
Abstract:
High-temperature chlorination of HPLC fullerene fractions containing mainly C92 /C94 and C102 /C104 resulted in the isolation and X-ray structural characterization of chloro derivatives of azafullerenes, C59 NCl5 and C97 NCl21 . It was assumed that formation of azafullerenes in the arc-discharge synthesis of fullerenes occurred due to air leakage into the reactor. The molecule of C59 NCl5 contains an isolated aromatic pyrrole ring on the fullerene cage and possesses C5v symmetrical shape typical of other known C59 NR5 derivatives. The molecule of non-classical (NC) C97 N(NC)Cl21 contains an NC6 heptagon on the azafullerene cage that assumes its formation by a C2 loss from C99 N in the course of chlorination. The chlorination pattern is characterized by the presence of stabilizing isolated aromatic systems and isolated double C=C bonds on the C97 N(NC) azafullerene cage.
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