Reaction of isocyanates with o-hydroxy aromatic aldehydes. Condensations of 3,4-Dihydro-4-hydroxy-3-alkyl-2H-1,3-benzoxazin-2-ones with compounds having active hydrogen
Reaction of isocyanates with o-hydroxy aromatic aldehydes. Condensations of 3,4-Dihydro-4-hydroxy-3-alkyl-2H-1,3-benzoxazin-2-ones with compounds having active hydrogen