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However, this protocol has rarely been utilized to fabricate structurally defined carbon nanosheets composed of sp\u2010 and sp\n                    <jats:sup>2<\/jats:sup>\n                    \u2010hybridized carbon atoms. Here, we present the synthesis of butadiyne\u2010linked hexabenzocoronenes (HBCs) on Au(111) surfaces as core\u2010expanded graphdiynes. The reaction started from hexa(4\u2010ethylphenyl)benzene, which undergoes dehydrogenation toward hexa(4\u2010vinylphenyl)benzene, followed by planarization to hexabenzocoronene, coupling between the vinyl groups, and further dehydrogenation. In addition to butadiyne linkages, benzene groups were also found as another type of linker. The reaction sequences were monitored by scanning tunneling microscopy and bond\u2010resolved non\u2010contact atomic force microscopy, which disclose the structures of intermediates and final products. In combination with density functional theory simulations, the key steps from ethyl substituents to butadiyne and benzene linkers were elucidated. This is a new on\u2010surface synthesis of core\u2010expanded graphdiynes with unprecedented electronic properties.\n                  <\/jats:p>","DOI":"10.1002\/anie.202411722","type":"journal-article","created":{"date-parts":[[2024,7,31]],"date-time":"2024-07-31T02:39:26Z","timestamp":1722393566000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Synthesis of Hexabenzocoronene\u2010Cored Graphdiyne Nanosheets through Dehydrogenative Coupling on Au(111) Surface"],"prefix":"10.1002","volume":"63","author":[{"given":"Lina","family":"Wang","sequence":"first","affiliation":[{"name":"Institute of Functional Nano &amp; Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials &amp; Devices Soochow University  199 Ren'ai Road Suzhou 215123 P. R. 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