| Budget Amount *help |
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2016: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2014: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
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| Outline of Final Research Achievements |
Triplet carbenes are very difficult to stabilize, and the synthesis of isolable triplet carbenes is a worthwhile challenge. Tomioka et al. have reported two long-living carbenes in solution. However, the isolation of triplet carbenes in the solid state still remains to be achieved.
Recently, we proposed a new strategy for the generation of triplet carbenes by two-electron oxidation of allenic precursors bearing two thioxanthene or acridene moieties. Oxidation of allenic compound bearing two diphenoxyacridene moieties resulted in a cyclized product and 3,5-ditBuphenoexy substituted system resulted in a stable singlet carbene after two electron oxidation. But we succeeded in preparation of sterically very rigid allene and the oxidation afforded the target triplet carbene. Although the triplet carbene was stable only at low temperatures, we could observe the characteristic ESR signals of the target triplet carbene.
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