Recyclable and Convenient-to-Handle Pt/Ethylene Glycol Catalytic System – an Approach to Sustainable Hydrosilylation

19 September 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

This study presents a highly efficient and simple recyclable catalytic system for heterophase hydrosilylation. This catalytic system consisting of a commercially available platinum precatalyst, namely K2PtCl4, and a cheap green solvent, namely ethylene glycol (EG), is easily prepared by dissolving K2PtCl4 in EG without employing ligands, additives, or an inert atmosphere, at r.t. The suggested method allows up to 45 recycles with quantitative conversion under air at r.t. to be performed. The high reaction rate (from 2 to 20 min per cycle) and low catalyst load (0.001 – 0.1 mol%) allow high values of TON (up to ~ 104 – 105) and TOF (up to ~ 103 – 106) to be reached. This approach is applicable to a wide range of unsaturated compounds, such as functional and nonfunctional terminal or internal alkenes, alkynes, and alkyl-, phenyl-, and siloxy-containing hydride silanes. Moreover, the heterophase catalytic system is suitable for the synthesis of linear and cross-linked polyorganosiloxanes. In most cases, the reaction provides high yields (up to 95-99%) and selectivity. It gives mostly anti-Markovnikov products which can be isolated from the catalytic system by simple decantation. The process is scalable to gram quantities.

Keywords

Hydrosilylation
heterophase catalysis
recycling and regeneration
hydride silanes
unsaturated hydrocarbons
platinum
ethylene glycol
silicones
organosiloxanes

Supplementary materials

Title
Description
Actions
Title
SUPPLEMENTARY INFORMATION, Recyclable and Convenient-to-Handle Pt/Ethylene Glycol Catalytic System – an Approach to Sustainable Hydrosilylation
Description
The SUPPLEMENTARY INFORMATION presents the main experimental data, materials and methods.
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.