Kinetically stabilized congeners of carbenes, R C, possessing six valence electrons (four bonding electrons and two non-bonding electrons) have been restricted to Group 14 elements, R E (E=Si, Ge, Sn, Pb; R=alkyl or aryl) whereas isoelectronic Group 15 cations, divalent species of type [R E] (E=P, As, Sb, Bi; R=alkyl or aryl), were unknown. Herein, we report the first two examples, namely the bismuthenium ion [(2,6-Mes C H ) Bi][BAr ] (1; Mes=2,4,6-Me C H , Ar =3,5-(CF ) C H ) and the stibenium ion [(2,6-Mes C H ) Sb][B(C F ) ] (2), which were obtained by using a combination of bulky meta-terphenyl substituents and weakly coordinating anions.
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