Ethanol → Butyl norbornene 5-norbornene-2-carboxylic acid methyl ester

Participants

Reaction Steps

A 5-norbornene-2-carboxylic acid methyl ester monomer (14.64 g), a butyl norbornene monomer (6.14 g), and toluene (37 Ml) were added to a 250 Ml Schlenk flask. A solution of Pd(acac)2 (4.19 mg, acac=acetylacetonate) and [(Cy)3PH][B(C6F5)4] (32.8 mg) in dichloromethane (2 Ml) was added to the flask, and the reaction mixture was incubated at 90° C. for 10 hours while stirring. Then, the reaction solution was added to excess ethanol to obtain a white copolymer precipitate. The precipitate was filtered through a glass funnel and dried in a vacuum oven at 65° C. for 24 hours to give a 13.7 g of butyl norbornene/5-norbornene-2-carboxylic acid methyl ester copolymer (yield: 65.9 wt % based on the total weight of the monomers). The Mw and Mw/Mn of the polymer were 157,000 and 2.13, respectively.

Provenance & Evidence