mechanism2(AL6)

化學友今日講第二個新課程嘅mechanism，佢就係carboxylic acid and its derivatives嘅nucleophilic acyl substitution。Acyl係指 -COX e個 functional group(X = Cl, OH, OCOR, OCR同埋 NH2)。 為o左區分佢同 haloalkane 嘅 nucleophilic substitution，所以同學仔記住要寫埋acyl e o個字。

其實化學友覺得e個mechanism好有用，佢能夠幫助同學仔明白點樣可以將carboxylic acid 變成佢嘅derivatives。課程指定嘅example係hydrolysis of acyl chloride。其他嘅examples就有 carboxylic acids react with thionyl chloride, alcohols, ammonia and amines同埋 acyl chlorides react with alcohols, ammonia and amines。

以下就係 hydrolysis of ethanoyl chloride 嘅mechanism，大家要記熟呀:



同學仔亦可以睇o下下面嘅simple animation丫，會令你容易d記o架: