含高周期１４族元素芳香族化合物の化学

Abstract

Metallaaromatic compounds, i.e., [4n+2] π ring systems containing a heavier group 14 element, have attracted much attention in recent decades, since they represent the heavier congeners of carbocyclic aromatic compounds, which play very important roles in organic chemistry. However, such metallabenzenoids have only been characterized in low-temperature matrices or postulated as transient intermediates in some trapping reactions.Recently, we have succeeded in the synthesis of the first stable metallaaromatic compounds by taking advantage of efficient steric protection groups, 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (Tbt) and 2,6-bis[bis(trimethylsilyl)methyl]-4-[tris(trimethylsilyl)methyl]phenyl group (Bbt), and revealed their properties systematically. In this paper, we report the synthetic studies on the kinetically stabilized metallaaromatic compounds and their properties.