15686-33-6Relevant articles and documents
New aluminum 2,2′-methylenebis(4-chloro-3-methyl-6-(isopropyl) phenoxides): Structural characterization of an unusual ionic aluminum bisphenoxide [Al(THF)4(Cl)2]+[Al(mcmip) 2]-·x THF
Sypień, Jakub K.,Zevaco, Thomas A.,Flicker, Annette,Walter, Olaf,Dinjus, Eckhard
, p. 69 - 73 (2013)
The synthesis and X-ray structure determination of an uncommon ionic aluminum bisphenoxide [Al(THF)4(Cl)2] +[Al(mcmip)2]-·1.1 THF (1) and its neutral analogue (mcmip)Al(CH2CH3)(THF) (2) are reported (mcmipH2: 2,2′-methylenebis(4-chloro-3-methyl-6-(isopropyl) phenol). The ligand was reacted in THF with diethyl aluminum chloride, respectively triethyl aluminum, under liberation of ethane to yield crystalline aluminum bisphenoxides. Compound 2 exhibits the usual structural features found in neutral THF-aluminum bisphenoxides adducts whereas the ionic compound 1 consists of a cationic octahedral aluminum dichloride moiety, [Al(THF) 4(Cl)2], and an anionic di-bisphenoxide aluminate fragment [Al(mcmip)2] containing two 2,2′-methylenebis(4-chloro-3- methyl-6-(isopropyl)phenol) ligands. Both aluminum bisphenoxides were tested as catalysts in the copolymerization of cyclohexene oxide with CO2 and displayed similar good catalytic activities although the carbonate amounts present in the copolymer remain low.
Synthesis and structural studies of heterobimetallic alkoxide complexes supported by bis(phenolate) ligands: Efficient catalysts for ring-opening polymerization of l-lactide
Chen, Hsuan-Ying,Liu, Mei-Yu,Sutar, Alekha Kumar,Lin, Chu-Chieh
scheme or table, p. 665 - 674 (2010/03/25)
A series of heteroblmetallic titanium(IV) complexes [LTi(O′Pr)(μ- O′Pr)2Li(THF)2], [LTi(O′Pr)(μ-O′Pr) 2Na(THF)2], [LTi(μ-O′Pr)2Zn(O′ Pr)2], and [LTi(μ-O′Pr)2Mg(O′Pr) 2] (where L = bidentate bisphenol ligands) have been synthesized and characterized including a structural determination of [L1Ti(μ 2-O′Pr)2(O′Pr)Li(THF)2] (1a). These complexes were investigated for their utility in the ring-opening polymerization (ROP) of L-lactide (LA). Polymerization activities have been shown to correlate with the electronic properties of the substituent within the bisphenol ligand. In contrast to monometallic titanium Initiator 1e, all the heterobimetallic titanium initiators (Ti-Li, Ti-Na, Ti-Zn, and Ti-Mg) show enhanced catalytic activity toward ring-opening polymerization (ROP) of L-LA. In addition, the use of electron-donating methoxy or methylphenylsulfonyl functional ligands reveals the highest activity. The bisphenol bimetallic complexes give rise to controlled ring-opening polymerization, as shown by the linear relationship between the percentage conversion and the number-average molecular weight. The polymerization kinetics using 2c as an initiator were also studied, and the experimental results indicate that the reaction rate is first-order with respect to both monomer and catalyst concentration with a polymerization rate constant, k = 81.64 M-1 min-1.