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Taking into account specific safety precautions, unequivocal qualitative characterization was achieved by Raman spectroscopy and X\u2010ray powder diffraction of supported copper catalysts Cu\/Bi\/SiO<jats:sub>2<\/jats:sub> during and after activation and catalysis in comparison to bulk Cu<jats:sub>2<\/jats:sub>C<jats:sub>2<\/jats:sub> materials. Quantification of Cu<jats:sub>2<\/jats:sub>C<jats:sub>2<\/jats:sub> succeeded by thermal analysis and Raman spectroscopy. Its formation in aqueous suspension is studied starting from copper(II) oxide catalysts including dissolution, reduction and precipitation steps. Copper acetylide formation can be correlated with catalytic performance in the ethynylation of formaldehyde to 1,4\u2010butynediol.<\/jats:p>","DOI":"10.1002\/chem.202101932","type":"journal-article","created":{"date-parts":[[2021,7,16]],"date-time":"2021-07-16T06:38:47Z","timestamp":1626417527000},"page":"16834-16839","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Walter Reppe Revival \u2013 Identification and Genesis of Copper Acetylides Cu<sub>2<\/sub>C<sub>2<\/sub> as Active Species in Ethynylation Reactions"],"prefix":"10.1002","volume":"27","author":[{"given":"Tobias","family":"Bruhm","sequence":"first","affiliation":[{"name":"Catalysis Research Center Technical University of Munich  Ernst-Otto-Fischer-Str. 2 85748 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrea","family":"Abram","sequence":"additional","affiliation":[{"name":"Catalysis Research Center Technical University of Munich  Ernst-Otto-Fischer-Str. 2 85748 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Johannes","family":"H\u00e4usler","sequence":"additional","affiliation":[{"name":"Catalysis Research Center Technical University of Munich  Ernst-Otto-Fischer-Str. 2 85748 Garching Germany"},{"name":"Forschungszentrum J\u00fclich GmbH  Wilhelm-Johnen-Str. 52425 J\u00fclich Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Oliver","family":"Thomys","sequence":"additional","affiliation":[{"name":"Catalysis Research Center Technical University of Munich  Ernst-Otto-Fischer-Str. 2 85748 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3008-7875","authenticated-orcid":false,"given":"Klaus","family":"K\u00f6hler","sequence":"additional","affiliation":[{"name":"Department of Chemistry Technical University of Munich  Lichtenbergstr. 4 85748 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,8]]},"reference":[{"key":"e_1_2_2_1_1","unstructured":"\u00a0"},{"key":"e_1_2_2_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/jlac.19555960102"},{"key":"e_1_2_2_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/jlac.19555960102"},{"key":"e_1_2_2_4_2","unstructured":"R.\u2005J. 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