Oxygen scavenging by lithium zincates: the synthesis, structural characterisation and derivatisation of [Ph(2-C5H4N)N]2ZnRLi·nthf (R = But, Bun; n= 1, 2)
作者： Sally R. Boss , Robert Haigh , David J. Linton , Andrew E. H. Wheatley
DOI: 10.1039/B203451D
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摘要: The 1 ∶ 2 reaction of ZnMe2 with N-2-pyridylaniline, Ph(2-C5H4N)NH 1, affords [Ph(2-C5H4N)N]2Zn 10, the treatment which BuLi and thf diastereomeric lithium zincate [Ph(2-C5H4N)N]2ZnRLi·nthf (R = Bun, n = 2; 11a; R But, 11b). sequential 10 (either in situ or after isolation) organolithium substrates molecular oxygen has afforded insights into oxygen-scavenging capacity mixed Group 1–Group 12 species. Hence, reacts BunLi, O2 and dimethoxyethane (dme) to give {[Ph(2-C5H4N)N]2ZnOBunLi·nL}2 (n = L thf, 12a; 0.5, dme, 12b), structural relationship between 11a 12a strongly suggesting that for Bun oxygenation proceeds by insertion Zn–C bond an {[Ph(2-C5H4N)N]2ZnR}− ion. employment ButLi, O2 together only previously reported complex [Ph(2-C5H4N)N]2Zn[(μ3-O)But]2(Li·thf)24, the formation may be rationalised terms But van der Waals radius cone angle.
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