申请人:Ciba-Geigy Corporation
公开号:US04045518A1
公开(公告)日:1977-08-30
2-Oxo-2-alkoxy-5-dialkylphosphono-1,2-oxaphospholanes of the formula ##STR1## in which R.sub.1 to R.sub.7 are hydrocarbon radicals can be prepared from .alpha.,.beta.-unsaturated ketones and 2 or more moles of a dialkyl phosphite. Obviously .alpha.-ketophosphonates are intermediates of this reaction, as these compounds react with 1 or more moles of dialkyl phosphite in yielding the oxaphospholanes too. Both reactions are promoted by alkaline catalysts. The new oxaphospholane derivatives are considerably stable against thermal decomposition. They are compatible with polymeric materials and can be used as flame protecting agent for plastics and resins, for example, in polyurethane foams.
可以从α,β-不饱和酮和2个或更多摩尔的二烷基磷酸酯制备具有以下公式的2-氧代-2-烷氧基-5-二烷基膦酸酯-1,2-氧代膦环##STR1##其中R.sub.1至R.sub.7为碳氢基团。显然,α-酮膦酸酯是这种反应的中间体,因为这些化合物与1个或更多摩尔的二烷基磷酸酯反应也会产生氧代膦环。这两种反应都受碱性催化剂的促进。这些新的氧代膦环衍生物在热分解方面相当稳定。它们与聚合材料兼容,可以用作塑料和树脂的阻燃剂,例如聚氨酯泡沫中。