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aromaticity: two sides of the same coin? Angew Chem Int Ed 53:12191–12195
64. Moezzi A, Bartlett RA, Power PP (1992) Reduction of a boron–nitrogen 1,3-butadiene
analogue: evidence for a strong B–B π-bond. Angew Chem Int Ed Engl 31:1082–1083
65. Moezzi A, Olmstead MM, Power PP (1992) Boron-boron double bonding in the species
[B 2 R 4 ]
2−
: synthesis and structure of [{(Et 2 O)Li} 2 {Mes 2 BB(Mes)Ph}], a diborane(4) dianion
analog of a substituted ethylene. J Am Chem Soc 114:2715–2717
66. Nöth H, Knizek J, Ponikwar W (1999) A boron–boron double bond in the dianions of tetra
(amino)diborates. Eur J Inorg Chem 1999:1931–1937
67. Shoji Y, Matsuo T, Hashizume D, Fueno H, Tanaka K, Tamao K (2010) A stable doubly
hydrogen-bridged butterfly-shaped diborane(4) compound. J Am Chem Soc 132:8258–8260
68. Grigsby WJ, Power P (1997) One-electron reductions of organodiborane(4) compounds:
singly reduced anions and rearrangement reactions. Chem Eur J 3:368–375
69. Grigsby WJ, Power PP (1996) Comparison of B–B π-bonding in singly reduced and neutral
diborane (4) derivatives: isolation and structure of [{Li(Et 2 O) 2 }{MeO(mes)BB(mes)OMe}].
Chem Commun 19:2235–2236
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XXVIII. New polyhedral borane anions, B 8 H 8
2−
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− , and B 7 H 7
2−
. Inorg Chem 6:
1271–1281
12 Rules of Aromaticity
335