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Systematic studies concerning the origin of the diastereoselectivities led to the proposal of a mechanism for this synthetically useful reaction. Acroleins with \u03b1\u2010branched alkyl side chains were coupled to give the corresponding <jats:italic>syn<\/jats:italic> pinacols, while on the other hand, acroleins with less bulky substituents furnished the <jats:italic>anti<\/jats:italic> derivatives. The effects of both the substrates and the reagents on the diastereo\u2010 and enantioselectivities were investigated. An unexpected catalytic formation of cyclopropanols was found.<\/jats:p>","DOI":"10.1002\/chem.200400304","type":"journal-article","created":{"date-parts":[[2005,3,17]],"date-time":"2005-03-17T16:18:36Z","timestamp":1111076316000},"page":"3127-3135","source":"Crossref","is-referenced-by-count":34,"title":["Chromium\u2010Catalyzed Pinacol\u2010Type Cross\u2010Coupling: Studies on Stereoselectivity"],"prefix":"10.1002","volume":"11","author":[{"given":"Ulrich","family":"Groth","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marc","family":"Jung","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Till","family":"Vogel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,4,28]]},"reference":[{"key":"e_1_2_6_1_2","unstructured":"For reviews see:"},{"key":"e_1_2_6_2_2","first-page":"592","volume-title":"Houben\u2013Weyl, Methoden der Organischen Chemie","author":"Kropf H.","year":"1984"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr00032a009"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.19961080408"},{"key":"e_1_2_6_4_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.199604481"},{"key":"e_1_2_6_5_2","unstructured":"For reviews see:"},{"key":"e_1_2_6_6_2","first-page":"1485","volume-title":"Houben\u2013Weyl, Methoden der Organischen Chemie","author":"Kropf H.","year":"1984"},{"key":"e_1_2_6_7_2","doi-asserted-by":"crossref","first-page":"563","DOI":"10.1016\/B978-0-08-052349-1.00073-1","volume-title":"Comprehensive Organic Synthesis","author":"Robertson G. 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