最新实验三-扑热息痛-附件教学讲义ppt课件.ppt

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1、实验三-扑热息痛-附件一、目的要求1、通过扑热息痛的制备，熟悉乙酰化反应的基本原理和具体操作。2、了解固体化合物精制的常用方法，掌握扑热息痛的精制方法。二、基本原理对氨基酚与醋酸经乙酰化反应生成对乙酰氨基酚，反应式如下：常用的乙酰化剂有醋酸、醋酐、乙酰氯等。使用醋酸时，由于该反应为可逆反应，水分的存在不利于正反应的进行，为使反应完全，要蒸除稀醋酸。五、思考题1．试比较冰醋酸、醋酐、乙酰氯三种乙酰化剂的优缺点，工业生产上为何以醋酸为此反应的主要酰化剂？2．精制产品时选水为溶剂有哪些必要条件？应注意哪些操作

2、上的问题。1.—Inatextmessage,88meansBye-bye.—AndanotherexampleisF2F__standsforfacetoface.A.thatB.whoC.whomD.it2.AfterMandelawasfreein1990,hechosetoshakehandswiththepeople__wantedtokillhim.A.whoseB.whichC./D.who3.“Underground”istheonlywordintheEnglishlanguage__

3、beginsandendswiththeletters“und”.A.whatB.thatC.whoD.whom4.—WhereistheSchoolEnglishSpeechContestgoingtobeheldtonight?—I’mnotsure.Isitinthehall__canhold300people?A.whereB.whatC.thatD.when5.—HaveyouseenthedocumentarynamedABiteofChina(《舌尖上的中国》)?—Yeah!It’s th

4、e mostfunny one __ I have ever seen.A.thatB.whatC.whichD.where6.—Whatkindofmoviesdoyoulike?—Ilikemovies_______scarymonsters（怪物）.A.whichhasB.thathaveC.whathasD.whyhave7.Theshop__sellsflowersisattheendofthestreet.A.whoB.whereC.which8.Iwillneverforgettheday

5、____wespentintheoldtownwithsmallhouses.A.whoB.whomC.thatD.what9.Doyouknowtheman___savedfivepeopleinthefire?A.whoB.itC.whenD.whom10.People___overweightneedmorewaterthanthinpeople.A.whoisB.whichareC.thatisD.whoare11.Heisunlikely(不大可能)tofindtheschool____het

6、aughtin50yearsago.A.whichB.whoC.whomD.what12.WhensomeChinesewomenweredancingtoloudmusicinaparkinNewYork,thepeoplelivednearbycalledthepolice.A.whoB.whomC.whoseD.which13.Doyouknowtheman__istalkingtoMissWu?A.heB.whomC.whoD.which14.Couldyoutellmetheresultoft

7、hediscussion__youhadmadeinthemeetingjustnow?A.thatB.whenC.howD.who15.Ireallylikethephotoofmyfamily_____mysistertookinthecityparklastyear.A.whichB.whoC.whatD.whom16.Tommycouldn’tstopthinkingabouttheboy__madehimafoolinthewholeofclass.A.whomB.whichC.whatD.w

8、ho17.—Whichisyournewneighbor,LiuHua?—Theman_______T-shirtisred.A.thatB.whoC.whichD.whose18.Doyouknowthegirl__istalkingwithourteacher?A.whoB.whoseC.whomD.where19.I’mlookingfortheCD__Iboughtyesterday.A.thatB.whoC.whoseD.when