Patent ID: 8993689
Filing Date: 2015-03-31
Classification: C07C,C08G,C08L

Abstract:
1. A method for making resins from syringaldehydes, comprising: reductively coupling syringaldehyde with an additional molecule of syringaldehyde or at least one aromatic aldehyde having a hydroxy group, and/or methoxy group in at least one position on said aldehyde by a McMurry reaction or by reductive chemical or electrochemical reaction to produce at least one first reductive coupling product; further reducing said first reductive coupling product by hydrogenation or chemical reduction or electrochemical reduction to produce a second reductive coupling product; deoxygenating and demethylating said second reductive product(s) by conversion to a sulfonate followed by reaction with a reductive elimination catalyst and further reaction with a hydrolyzing reagent to produce polyphenols; and converting said polyphenols by reaction with a soluble base and cyanogen halide(s) or pseudohalides to produce cyanate ester resin(s).