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1、Tetrahedron64(2008)9464–9470ContentslistsavailableatScienceDirectTetrahedronjournalhomepage:www.elsevier.com/locate/tetNewphotochromicdiaryletheneswithasix-memberedarylunitShouzhiPu*,CongbinFan,WenjuanMiao,GangLiuJiangxiKeyLaboratoryofOrganicChemistry,JiangxiSc
2、ience&TechnologyNormalUniversity,Nanchang330013,ChinaarticleinfoabstractArticlehistory:Anewclassofphotochromicdiarylethenesbearingasix-memberedarylunithasbeendeveloped.TheyReceived31May2008underwentreversiblecyclizationandcycloreversionreactionsuponalternatingi
3、rradiationwithUVandReceivedinrevisedform17July2008visiblelightbothinsolutionandinPMMAfilm.However,diarylethenes1,2,and4showednophoto-Accepted18July2008chromisminthecrystallinephasealthoughtheypackedwithananti-parallelconformationandtheAvailableonline23July2008di
4、stancesbetweenthetworeactivecarbonatomswerebothlessthan4.2Å.Ó2008ElsevierLtd.Allrightsreserved.1.Introductionmemberedarylringandavinylgroup.Theresultsareveryin-terestingandimportant,andtheycontributetoabroadun-Photochromicdiaryletheneshavebeenextensivelystudied
5、forderstandingofthephotochromismofdiarylethenederivativeswithoptoelectronicapplicationsbecauseoftheirnotablethermallyvariousarylgroups.Atthesametime,theresultshavealsogivenusirreversiblephotochromicbehaviorandremarkablefatiguere-somegoodsuggestionstodesignsomen
6、ewphotochromicdiaryl-sistance.1Uptodate,designandsynthesisofnewphotochromicethenesystems.Wepredictedthatdiarylethenewouldhavesomecompoundsisanactiveareaofresearch,andmanypublicationsnovelcharacteristicswhenreplacingafive-memberedheterocyclicconcerningsynthesisan
7、dinvestigationofthepropertiesofdiaryl-ringwithasix-memberedarylring.Asfarasweareaware,thereetheneswiththeheterocyclicarylringshavebeenreported.Amongaremanyreportsondiarylethenederivativeswithheteroaromaticdiaryletheneshithertoreported,mostoftheheteroarylmoietie
8、sringsasboththermallyirreversibleandreversiblephotochromichavebeenthiopheneorbenzothiophenerings,2withjustafewre-compounds,butinthecaseofsix-memberedringsasarylmoieties,port
