20THE ROLE OF PROTECTIVE GROUPS IN ORGANIC SYNTHESIS20有机合成中保护基团的使用If a satisfactory protective group has not been located,the chemist has a number of alternatives:rearrange the order of some of the st...

U27 The  acid-base titration starts with the dissolution of the solid acid sample in deionized water. Add the end-point indicator, which is phenolphthalein, with two drops to each flask containin...

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