常見例句雙語例句This paper reports the function of anhydrous potassium fluoride and acetonitrile in C-alkylation of active methylene group of acetoacetic ester.無水氟化鉀和乙腈在乙醯乙酸乙酯活潑亞甲基的C-烴基化中的作用。Then, sodium fluoride, potassium fluoride and (rubidium, cesium) fluoride was separated by concentrating, stepwise precipiting from the solution.分離後的溶液進行濃縮，分步析出氟化鈉、 氟化鉀和銣銫氟化物。The knoevenagel condensation of aromatic aldehydes with ethyl cyanoacetate proceeds smoothly in the presence of potassium fluoride giving products in high yield. Only the E isomers could be isolated.在氟化鉀催化下， 芳香醛與氰乙酸乙酯發(fā)生尅腦文格爾縮郃反應，得到高産率的縮郃産物。且衹得到E式異搆躰。 返回 potassium fluoride