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    • 5. 发明授权
    • Preparation of alkyl isocyanates
    • 烷基异氰酸酯的制备
    • US4384999A
    • 1983-05-24
    • US195648
    • 1980-10-09
    • Placido M. SpazianteLuigi GiuffreGiancarlo SioliMirco Fornaroli
    • Placido M. SpazianteLuigi GiuffreGiancarlo SioliMirco Fornaroli
    • C07C263/10C07C265/04C07C118/02
    • C07C263/10
    • A novel process for the preparation of alkyl isocyanates comprising reacting COX.sub.2 and an alkyl amine hydrohalide of the formulaR-NH.sub.2.HX Iwherein R is alkyl of 1 to 3 carbon atoms and X is a halogen either under pressure in an inert organic solvent or under atmospheric pressure in a high boiling organic solvent to form the corresponding alkyl carbamoyl halide, reacting the latter in an organic solvent with an urea of the formula ##STR1## wherein X' is selected from the group consisting of oxygen and sulfur, R.sub.1 and R.sub.3 are individually selected from the group consisting of alkyl of 1 to 7 carbon atoms, cycloalkyl of 4 to 6 carbon atoms and phenyl and R.sub.2 and R.sub.4 are individually selected from the group consisting of hydrogen, alkyl of 1 to 7 carbon atoms, cycyloalkyl of 4 to 6 carbon atoms and phenyl to obtain the corresponding alkyl isocyanate.
    • 一种用于制备烷基异氰酸酯的新方法,其包括使COX 2与式R-NH 2 .HX I的烷基胺氢卤酸反应,其中R是1至3个碳原子的烷基,X是卤素,在惰性有机溶剂中或在压力下, 在大气压下在高沸点有机溶剂中形成相应的烷基氨基甲酰卤,使其在有机溶剂中与下式的脲反应,其中X'选自氧和硫,R 1和 R3分别选自1至7个碳原子的烷基,4至6个碳原子的环烷基和苯基,R2和R4分别选自氢,1至7个碳原子的烷基,氰基烷基 4至6个碳原子和苯基,以获得相应的烷基异氰酸酯。