| 摘要 |
Methylidene malonate polymers (I) are prepared by the reaction of a 1-(2-(ethoxy-2-oxoethyl)-3-ethyl malonate or one of its derivatives (II) with formaldehyde in ethanol, in the presence of dimethylamine. The new polymers are of formula (I); R1 = 1-6C alkyl, or -(CH2)m-COOR3; R2 and R3 = 1-6C alkyl; m = 1 - 5; n = 0 - 10, preferably 0 - 5 . The starting material (II) is of formula (II); .The reaction is preferably effected at 0 - 80 (especially at 0 - 40) deg C using 7 - 49 equivalents of dimethylamine and of formaldehyde per equivalent of (II). The preferred process gives (I) where R1 = R2 = ethyl, m = 1, and n = 0, 1, or 2.
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