Calcium-Catalyzed Arene C-H Bond Activation by Low-Valent Al^I.

ABSTRACT: The low-valent ß-diketiminate complex (^DIPP BDI)Al is stable in benzene but addition of catalytic quantities of [(^DIPP BDI)CaH]₂ at 20 °C led to (^DIPP BDI)Al(Ph)H (^DIPP BDI=CH[C(CH₃ )N-DIPP]₂ , DIPP=2,6-diisopropylphenyl). Similar Ca-catalyzed C-H bond activation is demonstrated for toluene or p-xylene. For toluene a remarkable selectivity for meta-functionalization has been observed. Reaction of (^DIPP BDI)Al(m-tolyl)H with I₂ gave m-tolyl iodide, H₂ and (^DIPP BDI)AlI₂ which was recycled to (^DIPP BDI)Al. Attempts to catalyze this reaction with Mg or Zn hydride catalysts failed. Instead, the highly stable complexes (^DIPP BDI)Al(H)M(^DI

SUBMITTER: Brand S 

PROVIDER: S-EPMC6856855 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature