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For alkenes, anti\u2010Markovnikov hydroboration takes place; for alkynes the reaction proceeds with excellent trans\u20101,2\u2010selectivity. The most active pre\u2010catalyst is bench\u2010stable alkyl bisphosphine Mn<jats:sup>I<\/jats:sup> complex fac\u2010[Mn(dippe)(CO)<jats:sub>3<\/jats:sub>(CH<jats:sub>2<\/jats:sub>CH<jats:sub>2<\/jats:sub>CH<jats:sub>3<\/jats:sub>)]. The catalytic process is initiated by migratory insertion of a CO ligand into the Mn\u2013alkyl bond to yield an acyl intermediate, which undergoes B\u2212H bond cleavage of HBPin (for alkenes) and rapid C\u2212H bond cleavage (for alkynes), forming the active Mn<jats:sup>I<\/jats:sup> boryl and acetylide catalysts [Mn(dippe)(CO)<jats:sub>2<\/jats:sub>(BPin)] and [Mn(dippe)(CO)<jats:sub>2<\/jats:sub>(C\u2261CR)], respectively. A broad variety of aromatic and aliphatic alkenes and alkynes was efficiently and selectively borylated. Mechanistic insights are provided based on experimental data and DFT calculations revealing that an acceptorless reaction is operating involving dihydrogen release.<\/jats:p>","DOI":"10.1002\/ange.202110736","type":"journal-article","created":{"date-parts":[[2021,8,26]],"date-time":"2021-08-26T08:59:20Z","timestamp":1629968360000},"page":"24693-24697","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Hydroboration of Terminal Alkenes and <i>trans<\/i>\u20101,2\u2010Diboration of Terminal Alkynes Catalyzed by a Manganese(I) Alkyl Complex"],"prefix":"10.1002","volume":"133","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1777-0971","authenticated-orcid":false,"given":"Stefan","family":"Weber","sequence":"first","affiliation":[{"name":"Institute of Applied Synthetic Chemistry Vienna University of Technology  Getreidemarkt 9\/163-AC A-1060 Wien Austria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2241-3565","authenticated-orcid":false,"given":"Daniel","family":"Zobernig","sequence":"additional","affiliation":[{"name":"Institute of Applied Synthetic Chemistry Vienna University of Technology  Getreidemarkt 9\/163-AC A-1060 Wien Austria"}]},{"given":"Berthold","family":"St\u00f6ger","sequence":"additional","affiliation":[{"name":"X-Ray Center Vienna University of Technology  Getreidemarkt 9 A-1060 Wien Austria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5841-3519","authenticated-orcid":false,"given":"Luis F.","family":"Veiros","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural and Departamento de Engenharia Qu\u00edmica Instituto Superior T\u00e9cnico Universidade de Lisboa  Av Rovisco Pais 1049-001 Lisboa Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0872-6159","authenticated-orcid":false,"given":"Karl","family":"Kirchner","sequence":"additional","affiliation":[{"name":"Institute of Applied Synthetic Chemistry Vienna University of Technology  Getreidemarkt 9\/163-AC A-1060 Wien Austria"}]}],"member":"311","published-online":{"date-parts":[[2021,10,13]]},"reference":[{"key":"e_1_2_2_1_1","unstructured":"\u00a0"},{"key":"e_1_2_2_2_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0040-4039(01)95429-2"},{"key":"e_1_2_2_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr00039a007"},{"key":"e_1_2_2_4_2","doi-asserted-by":"publisher","DOI":"10.1021\/ar800036s"},{"key":"e_1_2_2_5_2","doi-asserted-by":"publisher","DOI":"10.1039\/C8GC02860E"},{"key":"e_1_2_2_6_1","unstructured":"\u00a0"},{"key":"e_1_2_2_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/jo01360a625"},{"key":"e_1_2_2_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja01472a028"},{"key":"e_1_2_2_9_1","doi-asserted-by":"publisher","DOI":"10.2174\/1385272053765060"},{"key":"e_1_2_2_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.198508781"},{"key":"e_1_2_2_10_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.19850971009"},{"key":"e_1_2_2_11_1","unstructured":"\u00a0"},{"key":"e_1_2_2_12_2","volume-title":"Metal-Catalyzed Hydroboration Reactions. 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