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1、摘要紫外光固化技術(shù)由于其在節(jié)能、環(huán)保,高效生產(chǎn)等方面具有的巨大優(yōu)勢,被越來越廣泛的應(yīng)用于郵電通訊、印刷包裝、計算機、電子和裝潢等行業(yè)。光引發(fā)劑是紫外光固化體系中的重要組成部分,咔唑基光引發(fā)劑是一種新型的雙光子光引發(fā)劑,雙光子吸收截面大,具有較好的光引發(fā)特性。本文合成了一種咔唑類肟酯型光引發(fā)劑——1.(6.鄰甲基苯甲?;甆一乙基咔唑).1.乙酮肟乙酯,探索出一條合理的合成路線,并在比較中得到較優(yōu)的工藝條件,為合成其他咔唑基光引發(fā)劑提供了理論和實踐的經(jīng)驗,具體的工藝操作如下:首先以乙基咔唑為原料,鄰甲基苯甲酰氯和乙酰氯為?;噭珹1C13為催化荊先后進行了乙基咔唑的鄰甲基苯甲?;鸵阴?/p>
2、基化反應(yīng),得到3.乙?;?.鄰甲基苯甲?;甆.乙基咔唑。在鄰甲基苯甲?;磻?yīng)中,使用少于原料摩爾量的AICl3就能使原料完全轉(zhuǎn)化,同時避免發(fā)生對稱二?;母狈磻?yīng)。并且由“一鍋法”進行兩步?;磻?yīng),使所用A1C13的總量大大減少,簡便了后處理過程,也減少了AICl3帶來的污染。接著利用鹽酸羥胺,在醋酸鈉的作用下,使3.乙?;?.鄰甲基苯甲?;甆.乙基咔唑肟化,得到1.(6一鄰甲基苯甲?;?N.乙基咔唑).1一乙酮肟。由于肟化反應(yīng)中副產(chǎn)的醋酸可以用作后續(xù)酯化反應(yīng)的酯化試劑,因此采用“一鍋法”進行肟化和酯化兩步反應(yīng),資源化利用了副產(chǎn)物醋酸,從反應(yīng)源頭減少了污染的產(chǎn)生,最后得到1.(
3、6.鄰甲基苯甲?;?N一乙基咔唑).1.乙酮肟乙酯。上述反應(yīng)總收率76.9%,所得產(chǎn)品1.(6.鄰甲基苯甲酰基.N一乙基咔唑).1一乙酮肟乙酯純度經(jīng)HPLC檢測為99.1%,結(jié)構(gòu)經(jīng)1H.NMR、"C.NMR和IR驗證正確。關(guān)鍵詞:光引發(fā)劑、咔唑、?;?、肟化、酯化IIABSTRACTUV-curingtechnologywaswidelyusedinmanyfieldsforitsgreatbenefitsinlowenergyconsuming,environmentprotectionandhigh-efficiencymanufacture,includingpostandtelec
4、ommunications,printandpackage,computer,electronicsandupholster,amongwhichphotoinitiatorsplayedthemostimportantrole.Especially,anewkindoftwo—photonphotoinitiatorsemergedrecentlywithacarbazolesubstructureexhibitedexcellentcharacterforitslargetwo-photonabsorptioncrosssection.Inthisthesis,anewphotoini
5、tiatorwithacarbazoleoximeestersubstructurenamedl·{6一(o-methylbenzoyl)一N—ethylcarbazol-3-yl}-ethane一1一oneoximeO-acetatewassynthesizedthroughareasonablerouteandalltheprocesswasoptimized.Theresultsprovidedtheoreticalandpracticalexperiencesforthesynthesisofothercarbazolederivativephotoinitiators.Theco
6、ncreteopermingprocedureswereshownasfollows.Firstly,3一acetyl·6一(o-methylbenzoyl)·N·ethylcarbazoleWaspreparedbysuccessiveo-methylbenzoylmionandacetylation,withN-ethylcarbazoleassubstrate,o-methylbenzoylchlorideandacetylchlorideasacylatingagents,andAICl3ascatalyst.Ino-methylbenzoylmion,therewasnoneed
7、forAICl3tobeusedasequimolarasthesubstratetoensurethecompleteconversionofthesubstrateandthediacylationwasavoided.Besides,theone—potacylationreducedthedosageofAICl3,andthusmadeaneasyworkupprocessandeasedthepollutio