[4-tert-Butyl-2,6-bis(diphenylmethyl)phenolato-κO]diethyl(tetrahydrofuran-κO)aluminium

Abstract

O)], was formed in the reaction between 4-tert-butyl-2,6-bis(diphenylmethyl)phenol and triethylaluminum in the presence of THF (THF is tetrahydrofuran) and recrystallized from hexane. The structure has monoclinic (P2 1 /n) symmetry with a single Al atom in the asymmetric unit. The terminal C atom of one ethyl substituent is nearly equally disordered over two positions. The complex possesses catalytic activity in the ring-opening polymerization of "-caprolactone.

Phenoxide and alkoxide complexes of Mg, Al and Zn, and their use for the ring-opening polymerization of ɛ-caprolactone with initiators of different natures

“…The crystal structures of Mg-BHT derivatives are currently being studied, mainly due to their application in the ROP of cyclic esters, but until recently they were poorly explored. A short survey of the Cambridge Structural Database (CSD, Version 5.38, with updates to May 2017; Groom et al, 2016) for crystal structures of Mg-OAr complexes, including Mg-BHT compounds, has been presented recently (Minyaev et al, 2017), which, however, does not cover the latest dimeric Mg-BHT structures published by Nifant'ev et al (2017d).…”

“…The latter allowed us to think that we were dealing with polynuclear alkoxide complexes containing terminal BHT groups as a result of aggregation (Nifant'ev et al, 2017d). Indeed, the tetranuclear complex [Mg 4 (BHT) 2 (OCH 2 CH 2 -NH 2 ) 6 ], which was obtained from the reactions of Mg(BHT) 2 (THF) 2 with HOCH 2 CH 2 NH 2 in 4:6 and even 1:1 molar ratios (Minyaev et al, 2017), can be regarded as such an example.…”