N-Benzoylbenzamidinate complexes of aluminium: highly efficient initiators for the ring-opening polymerization of ε-caprolactone

SET activation of nitroarenes by 2-azaallyl anions as a straightforward access to 2,5-dihydro-1,2,4-oxadiazoles

The use of nitroarenes as amino sources in synthesis is challenging. Herein is reported an unusual, straightforward, and transition metal-free method for the net [3 + 2]-cycloaddition reaction of 2-azaallyl anions with nitroarenes. The products of this reaction are diverse 2,5-dihydro-1,2,4-oxadiazoles (>40 examples, up to 95% yield). This method does not require an external reductant to reduce nitroarenes, nor does it employ nitrosoarenes, which are often used in N-O cycloadditions. Instead, it is proposed that the 2-azaallyl anions, which behave as super electron donors (SEDs), deliver an electron to the nitroarene to generate a nitroarene radical anion. A downstream 2-azaallyl radical coupling with a newly formed nitrosoarene is followed by ring closure to afford the observed products. This proposed reaction pathway is supported by computational studies and experimental evidence. Overall, this method uses readily available materials, is green, and exhibits a broad scope.

Comparing l-lactide and ε-caprolactone polymerization by using aluminum complexes bearing ketiminate ligands: steric, electronic, and chelating effects

Herein, the l-lactide polymerization rate of a series of Al complexes bearing ketimine ligands was investigated, and the polymerization characteristics between l-lactide and ε-caprolactone were compared.

Ring-opening polymerization of cyclohexene oxide using aluminum amine–phenolate complexes

Al(iii) catalysts at concentrations as low as 0.001% ring-open cyclohexene oxide to yield high molecular weight polyether with narrow dispersity.

Coordinating effect in ring-opening polymerization of ε-caprolactone using aluminum complexes bearing bisphenolate as catalysts

A series of Al complexes bearing diphenolate ligands was synthesized and their application for the ring-opening polymerization of ε-caprolactone was studied.

A closer look at ε-caprolactone polymerization catalyzed by alkyl aluminum complexes: the effect of induction period on overall catalytic activity

Previous studies on the ring-opening polymerization of ε-caprolactone using structurally related aluminum complexes as pre-catalysts showed inconsistent trends in the total conversion time.

Crystal structure ofN′-(2,6-dimethylphenyl)benzenecarboximidamide tetrahydrofuran monosolvate

The asymmetric unit of the title compound, C₁₅H₁₆N₂·C₄H₈O, contains two amidine mol­ecules (A and B) with slightly different conformations and two tetra­hydro­furan (THF) solvent mol­ecules. In the amidine mol­ecules, the di­methyl­phenyl ring and the NH₂ group lie to the same side of the N=C bond and the dihedral angles between the aromatic rings are 54.25 (7) (mol­ecule A) and 58.88 (6) ° (mol­ecule B). In the crystal, N—H⋯N hydrogen bonds link the amidine mol­ecules into [100] C(4) chains of alternating A and B mol­ecules. Both amidine mol­ecules form an N—H⋯O hydrogen bond to an adjacent THF solvent mol­ecule.