Details

Autor(en) / Beteiligte

• Samudrala, Kavyasripriya K.
• Conley, Matthew P.

Titel

A Supported Ziegler-Type Organohafnium Site Metabolizes Polypropylene

Ist Teil von

• Journal of the American Chemical Society, 2023-11, Vol.145 (45), p.24447-24451

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Cp2Hf­(CH3)2 reacts with silica containing strong aluminum Lewis sites to form Cp2Hf–13CH3 + paired with aluminate anions. Solid-state NMR studies show that this reaction also forms neutral organohafnium and hafnium sites lacking methyl groups. Cp2Hf–13CH3 + reacts with isotatic polypropylene (iPP, M n = 13.3 kDa; Đ = 2.4; mmmm = 94%; ∼110 C3H6/Hf) and H2 to form oils with moderate molecular weights (M n = 290–1200 Da) in good yields. The aliphatic oils show characteristic 13C­{1H} NMR properties consistent with complete loss of diastereoselectivity and formation of regioirregular errors under 1 atm H2. These results show that a Ziegler–Natta-type active site is compatible in a common reaction used to digest waste plastic into smaller aliphatic fragments.