Abstract
3-Phenyl-Δ2-isoxazoline-5-isocyanate (6) 3-phenyl-5-methyl-Δ2-isoxazoline-5-isocyanate (4) and 3-phenylisoxazole-5-isocyanate were prepared and they were treated with ethanol to give the corresponding urethans. (6) and (4) gave the corresponding isoxazoles by elimination of isocyanic acid by heating. The latter eliminates isocyanic acid at a temperature lower (>80°C) than the former (>180°C) by about 100°C.
Preparation of phenylene-bis (Δ2-isoxazoline-5-isocyanate) s was also conducted but purification by distillation has been unsuccessful. Phenylene-bis (isoxazole) s were obtained as single isolable products.
