申请人:Ciba-Geigy Corporation
公开号:US04042649A1
公开(公告)日:1977-08-16
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 .gamma.-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 can be used as flame retardants in epoxy resins.
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出具有公式##STR1##的2-氧代-2-烷氧基-5-二烷基膦酸酯-1,2-氧代磷杂环己烷。显然,γ-酮膦酸酯是该反应的中间体,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能产生氧代磷杂环己烷。这两种反应都由碱性催化剂促进。新的氧代磷杂环己烷衍生物在热分解方面具有相当的稳定性。它们可以用作环氧树脂中的阻燃剂。