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Alkyl Carbon–Oxygen Bond Cleavage of Aryl Alkyl Ethers by Iridium–Porphyrin and Rhodium–Porphyrin Complexes in Alkaline Media
Organometallics ( IF 2.8 ) Pub Date : 2017-09-11 00:00:00 , DOI: 10.1021/acs.organomet.7b00386
Chen Chen 1 , Kin Shing Chan 1
Affiliation  

Alkyl C–O bond cleavage in aryl alkyl ethers was achieved with Rh(ttp)Cl (1a; ttp = 5,10,15,20-tetrakis(p-tolyl)porphyrinato dianion) together with competitive alkyl C–H bond activation in alkaline media. In contrast, selective alkyl C–O bond cleavage occurred with the iridium–porphyrin Ir(ttp)(CO)Cl (1b)/KOH. Mechanistic investigations indicate the coexistence of MI(ttp) and M2II(ttp)2 (M = Rh, Ir) under basic conditions. With a weaker Rh(ttp)–Rh(ttp) bond, RhII(ttp)· metalloradical exists in an appreciable amount to cleave the alkyl C–H bond, competing with the alkyl C–O bond cleavage via RhI(ttp). In contrast, the more nucleophilic IrI(ttp) cleaves the alkyl C–O bond exclusively.

中文翻译:

铱-卟啉和铑-卟啉配合物在碱性介质中对芳烷基醚的烷基碳氧键的裂解

用Rh(ttp)Cl(1a ; ttp = 5,10,15,20-四(甲苯基)卟啉对二价阴离子)在烷基烷基中进行烷基C–O键裂解,并在C3中活化烷基C–H键。碱性介质。相反,铱-卟啉Ir(ttp)(CO)Cl(1b)/ KOH发生选择性的烷基C-O键裂解。机理研究表明在基本条件下M I(ttp)-和M 2 II(ttp)2(M = Rh,Ir)共存。由于Rh(ttp)–Rh(ttp)键较弱,Rh II(ttp)·金属铁的存在量足以裂解烷基C–H键,与通过Rh I裂解的烷基C–O键竞争(ttp)-。相比之下,亲核性更高的Ir I(ttp)-仅能裂解烷基C-O键。
更新日期:2017-09-11
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