| 摘要 |
<p>Title cpds. have the formua:- (where R1 is lower alkyl; R2 is lower alkyl or alkoxy or Ph; R3 is Ph opt. substd. (e.g. by halogen, alkyl or alkoxy), phenalkyl opt. substd., alkyl, haloalkyl, cyanoalkyl, alkenyl, alkynyl or Alkyl interrupted by one or more O or S atoms; X is O or or S; R2 is alkyl or Ph when R2 is alkyl). A prefd. cpd. has R1 and R2 = Et, X = S and R3 = benzyl. Prepn. is by reacting an appropriate phosphorus halide with MO-CH=CMe.COOR3 where M is an alkali metal.</p> |
