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This report describes a Vitamin B\n                    <jats:sub>12<\/jats:sub>\n                    \u2010photocatalyzed approach for the cyclopropanation of electron\u2010deficient alkenes using dichloromethane (CH\n                    <jats:sub>2<\/jats:sub>\n                    Cl\n                    <jats:sub>2<\/jats:sub>\n                    ) as the methylene source. The reaction proceeds in good to excellent yields under mild conditions, has excellent functional group compatibility, and is highly chemoselective. The scope could also be extended to the preparation of D\n                    <jats:sub>2<\/jats:sub>\n                    \u2010cyclopropyl and methyl\u2010substituted cyclopropyl adducts starting from CD\n                    <jats:sub>2<\/jats:sub>\n                    Cl\n                    <jats:sub>2<\/jats:sub>\n                    and 1,1\u2010dichloroethane, respectively.\n                  <\/jats:p>","DOI":"10.1002\/anie.202316064","type":"journal-article","created":{"date-parts":[[2023,11,28]],"date-time":"2023-11-28T14:19:39Z","timestamp":1701181179000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":58,"title":["Vitamin B\n                    <sub>12<\/sub>\n                    \u2010Photocatalyzed Cyclopropanation of Electron\u2010Deficient Alkenes Using Dichloromethane as the Methylene Source**"],"prefix":"10.1002","volume":"63","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-3989-7503","authenticated-orcid":false,"given":"John Hayford G.","family":"Teye\u2010Kau","sequence":"first","affiliation":[{"name":"Department of Chemistry Oklahoma State University  107 Physical Sciences Stillwater OK 74078 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7954-5403","authenticated-orcid":false,"given":"Mayokun J.","family":"Ayodele","sequence":"additional","affiliation":[{"name":"Weaver Labs LLC  1110 S. 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