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  • Palladium-Catalyzed Insertion of Ethylene and 1,1-Disubstituted Difunctional Olefins: An Experimental and Computational Study.

Palladium-Catalyzed Insertion of Ethylene and 1,1-Disubstituted Difunctional Olefins: An Experimental and Computational Study.

ChemPlusChem (2020-06-26)
Shahaji R Gaikwad, Ketan Patel, Satej S Deshmukh, Nilesh R Mote, Rajkumar S Birajdar, Satish P Pandole, Jeetender Chugh, Samir H Chikkali
ABSTRACT

Insertion or coordination copolymerization of ethylene with di-substituted olefins is challenging and the choice of di-substituted mono-functional olefin versus di-substituted di-functional olefin (DDO) appears to be decisive. Here we show that DDO-inserted species are amenable to ethylene insertion and polymerization. DDOs such as 2-acetamidoacrylic acid (AAA), methyl 2-acetamidoacrylate (MAAA), and ethyl 2-cyanoacrylate (ECA) were treated with palladium complex [{P∧O}PdMe(L)] (P∧O=κ2 -P,O-Ar2 PC6 H4 SO2 O with Ar=2-MeOC6 H4 ; L=C2 H6 OS) and the existence of respective insertion intermediates in moderate yield (up to 37 %) was established. These intermediates were exposed to ethylene and corresponding ethylene-inserted products were isolated and characterized. A careful comparison with three model compounds confirmed ethylene insertion and polymerization. Thus, the combined experimental and computational investigations show that DDO-inserted species can undergo ethylene insertion and polymerization.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
2-Acetamidoacrylic acid, 99%
Sigma-Aldrich
Methyl 2-acetamidoacrylate, 98%
Sigma-Aldrich
Ethyl 2-cyanoacrylate, liquid