Synthesis of Amine Derivatives of the Polyhedral Borane Anion [B(20)H(18)](4)(-).
Ethylenediamine (en) reacts with the polyhedral borane anion [n-B(20)H(18)](2)(-), in the presence or absence of strong nonnucleophilic auxiliary bases, to produce the [ae-B(20)H(17)(en)](3)(-) anion. In either case, substitution is accompanied, to an approximately equal extent, by reduction of the starting material to form [a(2)()-B(20)H(18)](4)(-). As found with similar substituted systems derived from this 20-boron structure, [ae-B(20)H(17)(en)](3)(-) may be conveniently rearranged to the [a(2)()-B(20)H(17)(en)](3)(-) anion. A more convenient synthesis of the known [ae-B(20)H(17)NH(3)](3)(-) ion, which employs acetonitrile as the source of the NH(3) ligand instead of liquid ammonia, is also described.
Georgiev
Emil M.
EM
Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, California 90095.
Shelly
Kenneth
K
Feakes
Debra A.
DA
Kuniyoshi
Jeremy
J
Romano
Solomon
S
Hawthorne
M. Frederick
MF