Abstract
The new chiral PNP pincer ligand N2,N6-bis((3aR, 8aR)-2,2-dimethyl-4,4,8,8-tetraphenyltetrahydro[1,3]dioxolo[4,5-e][1,3,2]dioxaphosphepin-6-yl)pyridine-2,6-diamine (PNP-TADDOL) was synthesized in 80% isolated yield. Complexes of the type [M(PNP-TADDOL)(CO)3] (M = Cr, Mo, and W) were prepared via a solvothermal approach. This methodology constitutes a fast, simple, and practical synthetic method to obtain complexes of that type in high isolated yields. The X-ray structure of the molybdenum complex is presented.Graphical abstract
Highlights
PNP pincer ligands with a pyridine backbone and phosphorus donors connected in the two ortho position via CH2, O, NH, or NR spacers are widely utilized in transition metal chemistry
In continuation of our studies on group six PNP complexes, we report here the synthesis of chiral zero valent Cr, Mo, and W PNP pincer complexes based on ((4R,5R)-2,2-dimethyl-1,3-dioxolane-4,5diyl)bis(diphenylmethanol) (R,R-TADDOL)
Steric and electronic properties of these complexes could be directly compared with a series of other group six metal PNP pincer tricarbonyl complexes
Summary
PNP pincer ligands with a pyridine backbone and phosphorus donors connected in the two ortho position via CH2, O, NH, or NR spacers are widely utilized in transition metal chemistry. Abstract The new chiral PNP pincer ligand N2,N6-bis((3aR, 8aR)-2,2-dimethyl-4,4,8,8-tetraphenyltetrahydro[1,3]dioxolo[4,5e][1,3,2]dioxaphosphepin-6-yl)pyridine-2,6-diamine (PNP-TADDOL) was synthesized in 80% isolated yield. Complexes of the type [M(PNP-TADDOL)(CO)3] (M = Cr, Mo, and W) were prepared via a solvothermal approach.
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