高曉娜,馬夏坪,魏學(xué)紅
(山西大學(xué) 應(yīng)用化學(xué)研究所,山西 太原 030006)
氨基酚氧基鋅化合物的合成與結(jié)構(gòu)
高曉娜,馬夏坪,魏學(xué)紅*
(山西大學(xué) 應(yīng)用化學(xué)研究所,山西 太原 030006)
以2,4-二叔丁基苯酚,甲醛,N-甲基苯胺為起始原料,通過Mannich反應(yīng)合成了相應(yīng)的二齒氨基酚2-[CH3(C6H5)NCH2]-4,6-But2C6H2OH(1),然后將1與二乙基鋅反應(yīng)得到了目標配合物氨基酚氧基鋅化合物[2-[CH3(C6H5)NCH2]-4,6-But2C6H2OZnEt]2(2).最后,通過元素分析,1H-NMR,13C-NMR,X-射線單晶衍射等手段對其進行了結(jié)構(gòu)表征.
有機化合物的合成;(有機金屬配合物)氨基酚氧基鋅配合物;結(jié)構(gòu)表征
近年來,對催化可再生資源二氧化碳與環(huán)氧化物共聚合生成具備生物可降解性等特質(zhì)的聚碳酸酯材料[1]的研究,尤其是對催化丙交酯開環(huán)聚合生成兼具多種優(yōu)良特點的高分子量聚乳酸過程中催化劑的研究是國內(nèi)外相關(guān)研究者的研究熱點之一[2-4].其中,氨基酚類配體,因其制備方法簡便(可由相應(yīng)的一級或二級胺、甲醛或多聚甲醛和酚按經(jīng)典的Mannich反應(yīng)制得)、配位能力較強(含多個配位點)、且與鋅配位所生成的無色低毒有機鋅配合物被證明在催化丙交酯聚合過程中顯示出很好的催化性能[5-10],故而得到了人們的廣泛關(guān)注.
2,4-二叔丁基苯酚,二乙基鋅(Alfa Aesar試劑公司,分析純),乙醚,N-甲基苯胺,甲醛質(zhì)量濃度(37%~40%)(北京化學(xué)試劑公司,分析純);乙醚在使用前經(jīng)無水無氧處理.
瑞士Bruker DRX300超導(dǎo)核磁共振儀,Bruker Smart CCD X-射線單晶衍射儀,Vario EL-III元素分析儀(德國).
金屬化合物參與的反應(yīng)均是在經(jīng)鉀柱干燥處理過的高純氮氣或氬氣保護下進行,使用標準的Schlenk技術(shù)操作.
式1 目標化合物的合成路線Scheme 1 Synthetic route to the title compound
將2.06 g(10.0 mmol)2,4-二叔丁基苯酚,0.90 m L(12.0 mmol)37%~40%甲醛水溶液與1.07 g(10.0 mmol)N-甲基苯胺在60 m L甲醇中回流6~8 h,得到白色(稍泛黃)固體,抽濾,用乙醇重結(jié)晶,最終得到白色晶狀固體1,產(chǎn)率為60%.1H NMR(CDCl3):δ1.27[s,9H,(CH3)3],1.34[s,9 H,(CH3)3],2.85(s,3 H,NCH3),4.38(s,2H,NCH2),6.83~7.36(s,7 H,Ar-H,Ph-H);13C{1H}NMR:δ27.0[(CH3)3],29.1[(CH3)3],31.6[C(CH3)3],32.3[C(CH3)3],37.1(NCH3),57.65(NCH2),116.5,118.56,119.8,120.6,121.0,126.6,138.5,151.2(Ar-C,Ph-C).元素分析:C22H31NO 理論值(%)C,81.23,H,9.54,N,4.31.測得值(%)C,81.01,H,9.43,N,4.29.
配體1的合成采用經(jīng)典的Mannich反應(yīng),反應(yīng)物甲醛摩爾量在實驗中一般取理論值的1.2倍以使反應(yīng)充分,并使其先與胺反應(yīng)一段時間(必要時在冰浴下,因為該步是一個放熱過程),可以有效避免副反應(yīng)發(fā)生.
圖1 配合物2的單晶結(jié)構(gòu)Fig.1 Structure of compound 2
[1] Coates G W,Moore D R.Discrete Metal-Based Catalysts for the Copolymerization of CO2and Epoxides:Discovery,Reactivity,Optimization,and Mechanism[J].AngewChemIntEd,2004,43:6618-6639.
[2] Lahcini M,Castro P M,Kalmi M,etal.The Use of Tetra(phenylethynyl)tin as an Initiator for the Ring-Opening Polymerization of Lactide[J].Organometallics,2004,23:4547-4549.
[3] Russell S K,Gamble C L,Gibbins K J,etal.Stereoselective Controlled Polymerization of DL-Lactide with[Ti(trisphenolate)O-i-Pr]2Initiators[J].Macromolecules,2005,38:10336-10340.
[4] Umare P S,Tembe G L,Rao K V,etal.Catalytic Ring-opening Polymerization of L-lactide by Titanium Biphenoxy-alkoxide Initiators[J].JournalofMolecularCatalysisA:Chemical,2007,268:235-243.
[5] Willams C K,Breyvfogle L E,Chol S K,etal.A Highly Active Zinc Catalyst for the Controlled Polymerization of Lactide[J].JAmChemSoc,2003,125:11350-11359.
[6] Wheaton C A,Hayes P G,Ireland B J.Complexes of Mg,Ca and Zn as Homogeneous Catalysts for Lactide Polymerization[J].DaltonTrans,2009:4832-4846.
[7] Farwell J D,Hitchcock P B,Lappert M F,etal.Synthesis and Structures of some Sterically Hindered Zinc Complexes Containing 6-membered Zn NCCCN and ZnOCCCN rings[J].JournalofOrganometallicChemistry,2008,693:1861-1869.
[8] Gendler S,Segal S,Goldberg I,etal.Titanium and Zirconium Complexes of Dianionic and Trianionic Amine-Phenolate-Type Ligands in Catalysis of Lactide Polymerization[J].InorganicChemistry,2006,45:4783-4790.
[9] Balsells J,Carroll P J,Walsh P J.Achiral Tetrahydrosalen Ligands for the Synthesis ofC2-Symmetric Titanium Complexes:A Structure and Diastereoselectivity Study[J].InorganicChemistry,2001,40:5568-5574.
[10] Silvemail C M,Yao L J,Lyndal M R,etal.Structural and Mechanistic Studies of Bis(phenolato)amine Zinc(II)Catalysts for the Polymerization of E-Caprolactone[J].InorganicChemistry,2007,46:6565-6574.
[11] Dong Q C,Ma X P,Guo J P,etal.Synthesis,Characterization of a Novel Zinc Diamine-bisphenolate Complex and its Application as an Initiator for Ring-opening Polymerization of Rac-lactide[J].InorganicChemistryCommunications,2008,11:608-611.
Synthesis and Structure of Aminophenolate Zinc Compound
GAO Xiao-na,MA Xia-ping,WEI Xue-h(huán)ong
(InstituteofAppliedChemistry,ShanxiUniversity,Taiyuan030006,China)
synthesis of organic compound;organometallics;aminophenolate zinc compound
O627
A
0253-2395(2011)02-0257-03*
2010-10-05;
2010-10-29
山西省自然科學(xué)基金(2008011021;2008012013-2);山西省回國留學(xué)基金
高曉娜(1987-),女,山西永濟人,碩士研究生.*通訊作者:E-mail:xhwei@sxu.edu.cn