Mechanistic Study of Metal–Ligand Cooperativity in Mn(II)-Catalyzed Hydroborations: Hemilabile SNS Ligand Enables Metal Hydride-Free Reaction Pathway
A combined experimental and mechanistic study of the chemoselective hydroboration of carbonyls by the paramagnetic bis-amido Mn[SMeNSMe]2 complex (1) is described. The catalyst allows for room-temperature hydroboration of carbonyls at low catalyst loadings (0.1 mol %) and reaction times (
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description | A combined experimental and mechanistic study of the chemoselective hydroboration of carbonyls by the paramagnetic bis-amido Mn[SMeNSMe]2 complex (1) is described. The catalyst allows for room-temperature hydroboration of carbonyls at low catalyst loadings (0.1 mol %) and reaction times ( |
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Density functional theory (DFT) calculations showed that thioether hemilability of L is crucial during catalysis for providing the active coordinating site. Also, the frequently proposed Mn–H intermediate was found not to be the active species responsible for catalysis. Instead, an inner-sphere reaction pathway with carbonyl coordination to the metal center and amido-promoted B–H reactivity is proposed to be operative.</description><identifier>ISSN: 2155-5435</identifier><identifier>EISSN: 2155-5435</identifier><identifier>DOI: 10.1021/acscatal.1c02238</identifier><language>eng</language><publisher>WASHINGTON: American Chemical Society</publisher><subject>Chemistry ; Chemistry, Physical ; Physical Sciences ; Science & Technology</subject><ispartof>ACS catalysis, 2021-08, Vol.11 (15), p.9043-9051</ispartof><rights>2021 American Chemical Society</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>true</woscitedreferencessubscribed><woscitedreferencescount>17</woscitedreferencescount><woscitedreferencesoriginalsourcerecordid>wos000684035000008</woscitedreferencesoriginalsourcerecordid><citedby>FETCH-LOGICAL-a280t-64e059333ccc2fe9d83f7fe6462a77b25aaef6bf72fcc858d205d187e2a4ff413</citedby><cites>FETCH-LOGICAL-a280t-64e059333ccc2fe9d83f7fe6462a77b25aaef6bf72fcc858d205d187e2a4ff413</cites><orcidid>0000-0002-5424-6319 ; 0000-0002-7755-0524 ; 0000-0001-5689-1648 ; 0000-0002-8832-8187 ; 0000-0002-1133-7149 ; 0000-1001-5689-1648</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/acscatal.1c02238$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/acscatal.1c02238$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>315,781,785,2766,27081,27929,27930,39263,56743,56793</link.rule.ids></links><search><creatorcontrib>Elsby, Matthew R</creatorcontrib><creatorcontrib>Son, Mina</creatorcontrib><creatorcontrib>Oh, Changjin</creatorcontrib><creatorcontrib>Martin, Jessica</creatorcontrib><creatorcontrib>Baik, Mu-Hyun</creatorcontrib><creatorcontrib>Baker, R. Tom</creatorcontrib><title>Mechanistic Study of Metal–Ligand Cooperativity in Mn(II)-Catalyzed Hydroborations: Hemilabile SNS Ligand Enables Metal Hydride-Free Reaction Pathway</title><title>ACS catalysis</title><addtitle>ACS CATAL</addtitle><addtitle>ACS Catal</addtitle><description>A combined experimental and mechanistic study of the chemoselective hydroboration of carbonyls by the paramagnetic bis-amido Mn[SMeNSMe]2 complex (1) is described. The catalyst allows for room-temperature hydroboration of carbonyls at low catalyst loadings (0.1 mol %) and reaction times (<30 min). A series of mechanistic studies highlight the significance of bifunctional amido bis(thioether) ligand L to the success of the reaction, insight otherwise difficult to attain in paramagnetic systems. Kinetic studies using variable time normalization analysis revealed no unusual reaction kinetics, indicating the absence of side reactions. A borylated analogue of L was observed and characterized via mass spectrometry. Density functional theory (DFT) calculations showed that thioether hemilability of L is crucial during catalysis for providing the active coordinating site. Also, the frequently proposed Mn–H intermediate was found not to be the active species responsible for catalysis. Instead, an inner-sphere reaction pathway with carbonyl coordination to the metal center and amido-promoted B–H reactivity is proposed to be operative.</description><subject>Chemistry</subject><subject>Chemistry, Physical</subject><subject>Physical Sciences</subject><subject>Science & Technology</subject><issn>2155-5435</issn><issn>2155-5435</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>HGBXW</sourceid><recordid>eNqNkLFOwzAQhiMEEhWwM3oEQcBx4sSwoQhopRYQhTm6OGdqFGwUu6Aw8Q4MvB9PQkILYkHCy3n4v_9OXxBsR_Qgoiw6BOkkeKgPIkkZi8VKMGAR5yFPYr76678ebDl3T7uX8FRkdBC8T1DOwGjntSRTP69aYhWZYFf28fo21ndgKpJb-4gNeP2kfUu0IROzMxrthnm_s33BigzbqrGl7TPWuGMyxAddQ6lrJNOLKVn2nBooa3SL-i9GVxieNYjkGkH2LLkCP3uGdjNYU1A73FrOjeD27PQmH4bjy_NRfjIOgQnqwzRByo_iOJZSMoVHlYhVpjBNUgZZVjIOgCotVcaUlIKLilFeRSJDBolSSRRvBHTRKxvrXIOqeGz0AzRtEdGid1t8uy2Wbjtkb4E8Y2mVkxqNxB-sc5uKhMa8t0z7tPh_Otf-y2Bu58Z36P4C7U4o7u28MZ2Jv-_6BFXKoXg</recordid><startdate>20210806</startdate><enddate>20210806</enddate><creator>Elsby, Matthew R</creator><creator>Son, Mina</creator><creator>Oh, Changjin</creator><creator>Martin, Jessica</creator><creator>Baik, Mu-Hyun</creator><creator>Baker, R. 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Tom</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a280t-64e059333ccc2fe9d83f7fe6462a77b25aaef6bf72fcc858d205d187e2a4ff413</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Chemistry</topic><topic>Chemistry, Physical</topic><topic>Physical Sciences</topic><topic>Science & Technology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Elsby, Matthew R</creatorcontrib><creatorcontrib>Son, Mina</creatorcontrib><creatorcontrib>Oh, Changjin</creatorcontrib><creatorcontrib>Martin, Jessica</creatorcontrib><creatorcontrib>Baik, Mu-Hyun</creatorcontrib><creatorcontrib>Baker, R. Tom</creatorcontrib><collection>Web of Science Core Collection</collection><collection>Science Citation Index Expanded</collection><collection>Web of Science - Science Citation Index Expanded - 2021</collection><collection>CrossRef</collection><jtitle>ACS catalysis</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Elsby, Matthew R</au><au>Son, Mina</au><au>Oh, Changjin</au><au>Martin, Jessica</au><au>Baik, Mu-Hyun</au><au>Baker, R. Tom</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Mechanistic Study of Metal–Ligand Cooperativity in Mn(II)-Catalyzed Hydroborations: Hemilabile SNS Ligand Enables Metal Hydride-Free Reaction Pathway</atitle><jtitle>ACS catalysis</jtitle><stitle>ACS CATAL</stitle><addtitle>ACS Catal</addtitle><date>2021-08-06</date><risdate>2021</risdate><volume>11</volume><issue>15</issue><spage>9043</spage><epage>9051</epage><pages>9043-9051</pages><issn>2155-5435</issn><eissn>2155-5435</eissn><abstract>A combined experimental and mechanistic study of the chemoselective hydroboration of carbonyls by the paramagnetic bis-amido Mn[SMeNSMe]2 complex (1) is described. The catalyst allows for room-temperature hydroboration of carbonyls at low catalyst loadings (0.1 mol %) and reaction times (<30 min). A series of mechanistic studies highlight the significance of bifunctional amido bis(thioether) ligand L to the success of the reaction, insight otherwise difficult to attain in paramagnetic systems. Kinetic studies using variable time normalization analysis revealed no unusual reaction kinetics, indicating the absence of side reactions. A borylated analogue of L was observed and characterized via mass spectrometry. Density functional theory (DFT) calculations showed that thioether hemilability of L is crucial during catalysis for providing the active coordinating site. Also, the frequently proposed Mn–H intermediate was found not to be the active species responsible for catalysis. Instead, an inner-sphere reaction pathway with carbonyl coordination to the metal center and amido-promoted B–H reactivity is proposed to be operative.</abstract><cop>WASHINGTON</cop><pub>American Chemical Society</pub><doi>10.1021/acscatal.1c02238</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0002-5424-6319</orcidid><orcidid>https://orcid.org/0000-0002-7755-0524</orcidid><orcidid>https://orcid.org/0000-0001-5689-1648</orcidid><orcidid>https://orcid.org/0000-0002-8832-8187</orcidid><orcidid>https://orcid.org/0000-0002-1133-7149</orcidid><orcidid>https://orcid.org/0000-1001-5689-1648</orcidid></addata></record> |
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title | Mechanistic Study of Metal–Ligand Cooperativity in Mn(II)-Catalyzed Hydroborations: Hemilabile SNS Ligand Enables Metal Hydride-Free Reaction Pathway |
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