First isolation and kinetic study of hypervalent 10-As-5 organoarsenic compounds with a C-apical, O-equatorial configuration.

Hypervalent organoarsenic compounds violating the apicophilicity concept were isolated for the first time, and the energy of isomerization of these arsoranes to the more stable stereoisomers appeared to be lower than that of the phosphorus analogues based on the kinetic studies.