Thermal Dehydrogenation of Base‐Stabilized B2H5+ Complexes and Its Role in CH Borylation |
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| Authors: | Dr. Aleksandrs Prokofjevs |
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| Affiliation: | 1. Department of Chemistry, University of Michigan, 930 N. University Ave, Ann Arbor, MI 48109 (USA);2. Current address: Department of Chemistry, Northwestern University, 2145 Sheridan Rd, Evanston, IL 60208 (USA) |
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| Abstract: | Thermally induced dehydrogenation of the H‐bridged cation L2B2H5+ (L=Lewis base) is proposed to be the key step in the intramolecular C? H borylation of tertiary amine boranes activated with catalytic amounts of strong “hydridophiles”. Loss of H2 from L2B2H5+ generates the highly reactive cation L2B2H3+, which in its sp2‐sp3 diborane(4) form then undergoes either an intramolecular C? H insertion with B? B bond cleavage, or captures BH3 to produce L2B3H6+. The effect of the counterion stability on the outcome of the reaction is illustrated by formation of LBH2C6F5 complexes through disproportionation of L2B2H5+ HB(C6F5)3?. |
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| Keywords: | boron C H activation density‐functional calculations homogeneous catalysis Lewis bases |
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