At last , we used the base: LDA, dryice-acetone bath , to synthesize the enol phosphates and gain very high rigio-selectivity.
最后我们选用异二丙胺锂（LDA）为碱，在干冰丙酮浴下，合成了烯醇磷酸酯，并有很高的立体选择性。
2
Place 100 mL of pyridine in a 250-mL graduated cylinder , and, keeping the pyridine cold in an icebath, pass in dry sulfur dioxide until the volume reaches 200 mL.