ABSTRACT The benzoxazines of three naturally occurring phenylpropanoid phenols: ferulic, coumaric, and phloretic acids, and their esters are described. Benzoxazines with conjugated unsaturated chains exhibit unusual poor thermal stability and degrade partially at the polymerization temperature making necessary the use of a catalyst (BF 3. Et 2 O) to low the polymerization temperature and prevent degradation. Polybenzoxazines are prepared ...
