A Supported Ziegler-Type Organohafnium Site Metabolizes Polypropyl-ene

12 October 2023, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Cp2Hf(CH3)2 reacts with silica containing strong aluminum Lewis acid sites to form Cp2Hf–13CH3+ paired to aluminate ani-ons. Solid-state NMR characterization shows that this reaction also forms neutral organohafnium and hafnium sites lacking methyl groups. Cp2Hf–13CH3+ reacts with isotatic polypropylene (iPP, Mn = 13.3 kDa; Đ = 2.4; mmmm = 94 %; ~110 C3H6/Hf) in the presence of H2 to form oils with moderate molecular weights (Mn = 290 - 1200 Da) in good yields. The ali-phatic 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 typical Ziegler-Natta type active site is compatible in a common reaction used to digest waste plastic into smaller aliphatic fragments.

Supplementary materials

Title
Description
Actions
Title
Supporting Information
Description
Supporting information files
Actions

Comments

Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.