Synthesis, structural characterisation of new oligomeric alkyl aluminium (2,2′-methylene-p-chloro-bisphenoxides) and application as catalysts in polymerisation reactions involving cyclohexene oxide

Reaction of methyl aluminium-(2,2′-methylene-p-chloro-bisphenoxide) with 2,2′-di(hydroxymethyl)biphenyl: A new aluminium complex bearing two kinds of diolate ligands

“…The 13 C NMR spectrum revealed one signal (at 32.76 ppm) of the CH 2 bridge carbons of the diolate units, indicating that the two methylene groups were equivalent in solution. Similarly to the ethyl aluminium-(2,2 0 -methylene-p-chloro-bisphenoxide) reported by Zevaco et al [10], the 13 C NMR spectrum of 1 exhibited twelve aromatic carbon signals (see Section 3).…”

“…Although proper crystals of 1 were not grown for X-ray measurements, we proposed the trinuclear structure of the compound on the basis of the well-documented structure of the ethyl aluminium derivative Et 5 Al 3 [OC 6 H 3 (Cl)CH 2 -C 6 H 3 (Cl)O] 2 [10]. According to our studies [14], methyl and ethyl aluminium diolates exhibit the same structures.…”

“…During the last decade, aluminium 2,2 0 -methylene-bisphenoxides have been extensively studied by Lin [1][2][3][4][5][6][7], Okuda et al [8] and Lewiński et al [9] in the polymerisation of lactones, e-caprolactone and lactides, in Diels-Alder coupling reactions and in the Meerwein-Pondorf-Verley reduction. It has recently been shown by Zevaco et al [10] that ethyl aluminium 2,2 0 -methylene-p-chloro-bisphenoxides are highly active in the ROP of cyclohexene oxide and in the copolymerisation of cyclohexene oxide with CO 2 . New aluminium complexes for special purposes, such as catalysis of organic syntheses and polymerisation, are still in demand.…”

Controlled Synthesis of Novel Aryloxide Polynuclear Aluminum Species. Study of Their Catalytic Properties in Polymerization Processes

“…[8][9][10][11][12][13][14] In addition, aluminum alkoxide derivatives have proven to be very efficient catalysts in many polymerization reactions, such as ring-opening polymerization. [15][16][17][18][19][20] The appeal of aluminum is complemented by a rich structural chemistry; thus aluminum derivatives of a vast nuclearity range have been described. [21][22][23][24][25][26][27][28] In this note we report the synthesis and structural characterization of new aluminum aryloxide complexes.…”

Keggin-Type Heteropolyacid for Ring-Opening Polymerization of Cyclohexene Oxide: Molecular Weight Control

“…It can be seen that the g values are ranging between 23 and 37 ∘ C. These g values are different from that observed by Yahiaoui et al ( g = 75.23 ∘ C) over a clay catalyst [2]. As for the PCHO prepared by Zevaco et al over Aluminium alkoxides catalyst [20], the authors reported that they have not observed a clear glass transition temperature but a broad endotherm between 66 and 100 ∘ C (max at 70 ∘ C) which they have attributed to a melting point of their resulting polymer. The difference in the g value between our polymer and that of Yahiaoui et al and Zevaco et al might be due to the difference in the microstructure of the prepared polymer.…”