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    • 9. 发明授权
    • 5-Substituted phosphonate hydantoins and derivatives thereof
    • 5-取代的膦酸酯乙内酰脲及其衍生物
    • US4093809A
    • 1978-06-06
    • US698623
    • 1976-06-21
    • Luther A. R. HallDavid A. Gordon
    • Luther A. R. HallDavid A. Gordon
    • C08G59/00C07D233/72C07F9/6506C08G59/10C07F9/65
    • C07F9/65062
    • Hydantoins of the formula ##STR1## wherein R.sub.1 is hydrogen or alkyl of 1 to 8 carbon atoms, R.sub.2 is ##STR2## R.sub.3 is alkyl of 1 to 8 carbon atoms, and X is a straight or branched chain alkylene of 1 to 4 carbon atoms or a straight or branched chain alkylene of 3 to 6 carbon atoms containing an internal carbamido group; or R.sub.1 and R.sub.2 together are Y where Y is a straight or branched chain alkylene of 4 to 8 carbon atoms having a pendant ##STR3## moiety are prepared by reacting first .alpha.,.beta.-unsaturated aldehydes or ketones with alkyl phosphites to form a phosphonate aldehyde or ketone followed by a classical Bucherer hydantoin synthesis.These compounds are intermediates for the preparation of polyglycidyl compounds useful in making flame-retardant epoxy resins. These hydantoins are also intermediates useful in preparing flame-retardant polyesters and polyurethanes.
    • 其中R 1为氢或1〜8个碳原子的烷基,其中R 2为1〜8个碳原子的烷基,X为1〜4个碳原子的直链或支链亚烷基 或含有内部氨基甲酰基的3〜6个碳原子的直链或支链亚烷基; 或者R 1和R 2一起是Y,其中Y是具有侧基的部分的具有4至8个碳原子的直链或支链亚烷基,其通过使第一α,β-不饱和醛或酮与亚磷酸烷基酯反应形成膦酸醛 或酮,然后是经典的Bucherer乙内酰脲合成。