| 摘要 |
vinyl phosphonates (phosphates) - as parasiticides. Cpds. (I):- (where R1 is 1-5C alkyl or alkoxy, opt. halo substd. phenyl, or 2-8C-dialkylamino; R2 is 1-5C alkyl; R is Me or Et, Z is Cl or Br; X is O or S and R3 is 1-5C alkyl opt. substd. by F, Cl, Br or 2-5C-alkoxy carbonyl, or Y is halogen, CN, NO2, 1-5C alkyl or alkoxy, 2-5C carbalkoxy, acetyl, 3-9C dialkylcarbonamides and n is 0-5) are prepd. by reacting R1-OR4 (where R is alkyl) with RC(Z)2-COX-R3. Thus (I, Z = Cl, R = Me, X = O, R3 = p-ClC6H4, R1 = R2 = Et) is prepd. from triethyl-phosphite and p-chlorophenyl alpha, alpha-dichloropropionate. |
