NDLI: Aluminum complexes derived from a hexadentate salen-type Schiff base: synthesis, structure, and catalysis for cyclic carbonate synthesis

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Aluminum complexes derived from a hexadentate salen-type Schiff base: synthesis, structure, and catalysis for cyclic carbonate synthesis

Content Provider	Royal Society of Chemistry (RSC)
Author	Yuan, Dan Wang, Yaorong Xu, Ya Yao, Yingming
Copyright Year	2017
Abstract	Different aluminum complexes were synthesized by the reaction of aluminum alkyls with a hexadentate salen-type Schiff base. The reaction of N,N′-bis(3,5-di-tert-butylsalicylidene)-2,2′-(ethylenedioxy)dianiline (LH2) with one equiv. of AlMe3 in toluene at 100 °C proceeded by methane elimination to produce the intermediate methyl complex [AlMeL] (1), and then subsequent intramolecular methyl migration to give the aluminum complex [AlL′] (2) [L′ = (2-O-3,5-tBu2C6H2)CHNC6H4OCH2CH2OC6H4NCH(Me)(2′-O-3′,5′-tBu2C6H2)]. The reaction of the same ligand with AlEt3 under the same experimental conditions involved ethane elimination, ethylene elimination and intramolecular hydrogen migration, and led to the complex [AlL′′] (3) [L′′ = (2-O-3,5-tBu2C6H2)CHNC6H4OCH2CH2OC6H4NCH2(2′-O-3′,5′-tBu2C6H2)]. However, the interaction of two equivalents of AlMe3 and AlEt3 afforded the corresponding binuclear complexes [(AlMe2)2L] (4) and [(AlEt2)2L] (5), respectively, and no methyl or hydrogen migration was found. The solid-state structures of aluminum complexes 1–3 were determined by single-crystal X-ray diffraction. It was found that complexes 2–5 show a very effective catalytic activity for the cycloaddition of epoxides and CO2 in the presence of NBu4Br as a cocatalyst at atmospheric pressure.
Starting Page	5848
Ending Page	5855
Page Count	8
File Format	HTM / HTML PDF
ISSN	14779226
Volume Number	46
Issue Number	18
Journal	Dalton Transactions
DOI	10.1039/c7dt00789b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Schiff LH2 Schiff base Liquid hydrogen Toluene Methane Rearrangement reaction Ligand Ethylene X-ray crystallography Cycloaddition Atmospheric pressure
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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