α-(5-Oxo-Δ3-isoxazolin-4-yl)benzylphosphonates (2) mostly exist in the NH form in the solid state, and in the OH form in non-polar solvents, owing to chelation with the phosphonyl group. The tautomeric equilibrium in solution is influenced by the nature of the 3-substituent in the isoxazole ring; the 3-methyl compounds exist partially in the NH form. A modified synthesis of these compounds is described
α-(5-氧代Δ 3 -isoxazolin -4-基)苄基
膦酸酯(2)主要是存在于在固体状态下的NH形式,而在非极性溶剂中的OH形式,由于与膦酰基螯合。溶液中的互变异构平衡受
异恶唑环中3-取代基的性质影响;3-甲基化合物部分以NH形式存在。描述了这些化合物的修饰的合成。