US 9,809,525 B2
Production of terephthalic acid via reductive coupling of propiolic acid or propiolic acid derivatives
Jeffrey Charles Hayes, West Chester, OH (US); Hairong Guan, Cincinnati, OH (US); and Dimitris Ioannis Collias, Mason, OH (US)
Assigned to The Procter & Gamble Company, Cincinnati, OH (US)
Filed by The Procter & Gamble Company, Cincinnati, OH (US)
Filed on Mar. 11, 2016, as Appl. No. 15/67,212.
Claims priority of provisional application 62/132,550, filed on Mar. 13, 2015.
Prior Publication US 2016/0264506 A1, Sep. 15, 2016
Int. Cl. C07C 51/15 (2006.01); C07C 51/353 (2006.01); C07C 51/377 (2006.01); C07C 51/38 (2006.01)
CPC C07C 51/38 (2013.01) [C07C 51/15 (2013.01); C07C 51/353 (2013.01); C07C 51/377 (2013.01)] 14 Claims
 
1. A method of making terephthalic acid comprising reductive coupling of two molecules of propiolic acid or propiolic acid derivatives followed by reaction with ethylene and dehydrogenation, wherein said reductive coupling comprises a catalyst, and wherein said catalyst comprises a metal selected from the group consisting of zinc, molybdenum, ruthenium, nickel, iron, cobalt, copper, palladium, and mixtures thereof.