At last , we used the base: LDA, dry ice-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。

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Place 100 mL of pyridine in a 250-mL graduated cylinder , and, keeping the pyridine cold in an ice bath, pass in dry sulfur dioxide until the volume reaches 200 mL.

将100ml的吡啶至250ml的量筒中，使吡啶在冰浴中保持冷，加干燥的二氧化硫直至体积达到200ml。

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