Effect of a Substituent in Cyclopentadienyl Ligand on Iridium-Catalyzed Acceptorless Dehydrogenation of Alcohols and 2-Methyl-1,2,3,4-tetrahydroquinoline

Catalysts

Takuya Shimbayashi¹  Jaeyoung Jeong¹  Ken-ichi Fujita¹ 

[1] Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan;

关键词: iridium complex;    cyclopentadienyl ligand;    functional ligand;    catalytic dehydrogenation;    alcohol;    n-heterocycle;   

DOI  :  10.3390/catal9100846

来源: DOAJ

【 摘 要 】

New iridium(III)-bipyridonate complexes having cyclopentadienyl ligands with a series of alkyl substituents were synthesized for the purpose of tuning the catalytic activity for acceptorless dehydrogenation reactions. A comparison of the catalytic activity was performed for the reaction of alcoholic substrates such as 1-phenylethanol, 2-octanol, and benzyl alcohol. The 1-t-butyl-2,3,4,5-tetramethylcyclopentadienyl iridium complex exhibited the best performance, which surpassed that of the 1,2,3,4,5-pentamethylcyclopentadienyl (Cp*) iridium catalyst in the dehydrogenation reaction of alcohols. The catalytic activity in the dehydrogenation of 2-methyl-1,2,3,4-tetrahydroquinoline was also examined. The highest efficiency was obtained in the reaction catalyzed by the same t-butyl-substituted cyclopentadienyl iridium complex.

【 授权许可】

Unknown