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Volumn 29, Issue 7, 2010, Pages 1824-1831

Selective activation of the ortho C?F bond in pentafluoropyridine by zerovalent nickel: Reaction via a metallophosphorane intermediate stabilized by neighboring group assistance from the pyridyl nitrogen

Author keywords

[No Author keywords available]

Indexed keywords

BENZYNE; BOND ACTIVATION; CHEMO-SELECTIVITY; COORDINATION MODES; METAL CENTERS; METALLOPHOSPHORANE; NICKEL COMPLEX; OXIDATIVE ADDITIONS; PENTAFLUOROPYRIDINE; PHOSPHINE LIGANDS; PYRIDYL; REACTION PATHWAYS; SELECTIVE ACTIVATION; TRANSITION STATE; ZEROVALENT;

EID: 77950841417     PISSN: 02767333     EISSN: 15206041     Source Type: Journal    
DOI: 10.1021/om100064z     Document Type: Article
Times cited : (85)

References (95)
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    • Note
    • 2] with tetrafluorobenzene, but these give way to the thermodynamic C?F activation products. (9)
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    • Note
    • The arguments put forward in the previous paragraphs suggest that the neighboring group effect should favor activation at the 2-position if phosphine-assisted pathways prevail over oxidative addition. Why, then, do we observe activation at the 4- rather than 2-position for the corresponding reactions with platinum, where both computational and experimental evidence confirms a prominent role for metallophosphoranes- The transition-state structure for activation at the 2-position does indeed show evidence for neighboring group participation by nitrogen, albeit not as conspicuous as in the nickel analogue (Pt?N = 2.35 Å, Ni?N 1.98 Å), probably because the greater stability of the Pt(II) oxidation state reduces the need for donation of electron density from the pyridyl ligand. Moreover, the Pt?C bonds (which are fully formed at the transition state) are very strong, and this favors activation in the 4-position. Thus the rather weak neighboring group effect in the platinum system is unable to overcome the intrinsic preference for activation at the 4-position dictated by the M?C bond strength.


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