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On-surface dehydro-Diels-Alder reaction of dibromo-bis(phenylethynyl)benzene
Journal of the American Chemical Society ( IF 14.695 ) Pub Date : 2020-01-14 , DOI: 10.1021/jacs.9b11755
Marco Di Giovannantonio; Ashok Keerthi; José I. Urgel; Martin Baumgarten; Xinliang Feng; Pascal Ruffieux; Akimitsu Narita; Roman Fasel; Klaus Müllen

On-surface synthesis under ultrahigh vacuum conditions is a powerful tool to achieve molecular structures which cannot be accessed via traditional wet chemistry. Nevertheless, only a very limited number of chemical reac-tions out of the wide variety known from solution chemistry have been reported to proceed readily on atomically flat substrates. Cycloadditions are a class of reactions that are particularly important in the synthesis of sp2-hybridized carbon-based nanostructures. Here, we report on a specific type of [4+2] cycloaddition, namely a dehydro-Diels-Alder (DDA) reaction, performed between bis(phenylethynyl)-benzene precursors on Au(111). Unlike a Diels-Alder reaction, DDA exploits ethynyl groups to achieve the formation of an extra six-membered ring. Despite its extensive use in solution chemistry for more than a century, this reaction has never been reported to occur on surfaces. The specific choice of our precursor molecule has led to the successful synthesis of benzo- and naphtho-fused tetracene and heptacene products bearing styryl groups, as confirmed by scanning tunneling microscopy and noncontact atomic force microscopy. The two products arise from DDA dimerization and trimerization of the precursor molecules, respectively, and their observation opens perspectives to use DDA reactions as a novel on-surface synthesis tool.
更新日期:2020-01-14

 

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