with TaCl2(CH3)3. Deuterium labeling of the phenol hydrogens and of the linking 1,3-benzenediyl ring reveals an unexpected mechanism involving protonolysis of a methyl group, followed by C−H/Ta−CH3 σ-bond metathesis, leading to cyclometalation of the linking ring and finally protonation of the cyclometalated group by the pendant phenol.
用TACl 2(CH 3)3使在邻位连接至苯环的二
酚金属化。
酚氢和连接1,3-苯二基环的
氘标记揭示涉及甲基,随后CH / TA-CH的质子分解意想不到机构3 σ键易位,导致所述连接环的环
金属化和最后由侧
苯酚使环
金属化的基团质子化。