| 摘要 |
The invention comprises vinyl phosphonic acid, its dichloride, its diesters with olefinically unsaturated alcohols containing at least 3 carbon atoms and one olefinic bond, and its diesters with phenols or with alcohols containing from 8 to 10 carbon atoms. Vinyl phosphonic acid dichloride may be obtained by reacting at least one diester of vinyl phosphonic acid of the general formula CH2=CH,P(O)(OR)2 wherein R is an alkyl or halogen-alkyl radical containing 1 to 18 carbon atoms, or an alkenyl radical containing 3 to 18 carbon atoms and at most one olefinic bond at 100 DEG to 160 DEG C. with phosphorus pentachloride preferably in the presence of a heavy metal halide, e.g. ferric, cupric or cuprous chloride or mixture thereof, as catalyst. Vinyl phosphonic acid may be obtained by reacting the dichloride with water in an inert organic solvent, and the diesters of the acid may be obtained by reacting the dichloride with an alcohol or a phenol the latter being preferably used in the form of an alkali metal phenolate. Suitable solvents for the reaction with water are methylene chloride, chloroform, carbon tetrachloride, p dichlorethylene, low boiling aliphatic hydrocarbons and benzene. An organic solvent may also be used in the reaction to form the di-esters. Specified diester products whose preparation is described are the diallyl, di-(2-ethyl-hexyl), di-n-decyl, and diphenyl esters. The products are valuable flame proofing agents, especially for textile materials containing cellulose. (See Group VIII). Specification 841,886 is is referred to.
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