| Autor: |
Majhi, Paresh Kumar, Chow, Keith C. F., Hsieh, Tom H. H., Bowes, Eric G., Schnakenburg, Gregor, Kennepohl, Pierre, Streubel, Rainer, Gates, Derek P. |
| Předmět: |
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| Zdroj: |
Chemical Communications; 1/18/2016, Vol. 52 Issue 5, p998-1001, 4p |
| Abstrakt: |
The reaction of MesP=CPh2 with the least sterically demanding N-heterocyclic carbene (NHC = IMe) results in formation of the ‘abnormal’ (C4-substituted) 4-phosphino-NHC (1). In contrast, reaction with Me2IMe gives the unprecedented ‘normal’ C2 adduct, Me2IMe → P(Mes)=CPh2 (2). Particularly striking is the asymmetric and weak bonding of the NHC to the P=C moiety in 2. DFT calculations indicate that the P=C natural bond order in 2 (1.54) still reflects significant π-character to the bond (cf. MesP=CPh2: NBO = 1.98). Further computational analysis suggests that π-delocalization into the remote C-phenyl substituents is key to stabilizing the NHC adduct. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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