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Computational study of C(sp3)-O bond formation at a PdIV centre

Canty, AJ, Ariafard, A ORCID: 0000-0003-2383-6380, Camasso, NM, Higgs, AT, Yates, BF ORCID: 0000-0001-9663-3301 and Sanford, MS 2017 , 'Computational study of C(sp3)-O bond formation at a PdIV centre' , Dalton Transactions, vol. 46, no. 11 , pp. 3742-3748 , doi: 10.1039/c7dt00096k.

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Abstract

This report describes a computational study of C(sp3)–OR bond formation from PdIV complexes of general structure PdIV(CH2CMe2-o-C6H4-C,C′)(F)(OR)(bpy-N,N′) (bpy = 2,2′-bipyridine). Dissociation of −OR from the different octahedral PdIV starting materials results in a common square-pyramidal PdIV cation. An SN2-type attack by −OR (−OR = phenoxide, acetate, difluoroacetate, and nitrate) then leads to C(sp3)–OR bond formation. In contrast, when −OR = triflate, concerted C(sp3)–C(sp2) bond-forming reductive elimination takes place, and the calculations indicate this outcome is the result of thermodynamic rather than kinetic control. The energy requirements for the dissociation and SN2 steps with different −OR follow opposing trends. The SN2 transition states exhibit “Pd⋯C⋯O” angles in a tight range of 151.5 to 153.0°, resulting from steric interactions between the oxygen atom and the gem-dimethyl group of the ligand. Conformational effects for various OR ligands and isomerisation of the complexes were also examined as components of the solution dynamics in these systems. In all cases, the trends observed computationally agree with those observed experimentally.

Item Type: Article
Authors/Creators:Canty, AJ and Ariafard, A and Camasso, NM and Higgs, AT and Yates, BF and Sanford, MS
Keywords: palladium, organopalladium, palladium(IV), SN2 mechanism, DFT
Journal or Publication Title: Dalton Transactions
Publisher: Royal Soc Chemistry
ISSN: 1477-9226
DOI / ID Number: 10.1039/c7dt00096k
Copyright Information:

Copyright 2017 The Royal Society of Chemistry

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