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Heterolysis of Dihydrogen by Nucleophilic Calcium Alkyls

Wilson, Andrew S. S. ; Dinoi, Chiara ; Hill, Michael S. ; Mahon, Mary F. ; Maron, Laurent

Angewandte Chemie (International ed.), 2018-11, Vol.57 (47), p.15500-15504 [Periódico revisado por pares]

Germany: Wiley Subscription Services, Inc

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  • Título:
    Heterolysis of Dihydrogen by Nucleophilic Calcium Alkyls
  • Autor: Wilson, Andrew S. S. ; Dinoi, Chiara ; Hill, Michael S. ; Mahon, Mary F. ; Maron, Laurent
  • Assuntos: Alkenes ; Calcium ; Catalysis ; Chemical Sciences ; Communication ; Communications ; Deduction ; density functional theory ; Hydrogen bonds ; Hydrogenation ; Hydrogenolysis ; Intermediates ; main group chemistry ; Metathesis ; or physical chemistry ; Organic chemistry ; Theoretical and
  • É parte de: Angewandte Chemie (International ed.), 2018-11, Vol.57 (47), p.15500-15504
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: β‐Diketiminato (BDI) calcium alkyl derivatives undergo hydrogenolysis with H2 to regenerate [(BDI)CaH]2, allowing the catalytic hydrogenation of a wide range of 1‐alkenes and norbornene under very mild conditions (2 bar H2, 298 K). The reactions are deduced to take place with the retention of the dimeric structures of the calcium hydrido‐alkyl and alkyl intermediates via a well‐defined sequence of Ca−H/C=C insertion and Ca−C hydrogenation events. This latter deduction is strongly supported by DFT calculations (B3PW91) performed on the 1‐hexene/H2 system, which also indicates that the hydrogenation transition states display features which discriminate them from a classical σ‐bond metathesis mechanism. In particular, NBO analysis identifies a strong second order interaction between the filled α‐methylene sp3 orbital of the n‐hexyl chain and the σ* orbital of the H2 molecule, signifying that the H−H bond is broken by what is effectively the nucleophilic displacement of hydride by the organic substituent. Hydrogen gets nuked: Hydrogenation of dimeric β‐diketiminato calcium alkyls occurs by nucleophilic attack and heterolysis of the H−H bond.
  • Editor: Germany: Wiley Subscription Services, Inc
  • Idioma: Inglês
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