Comparison of G3 and G4 theories for radical addition and abstraction reactions

Ching Yeh Lin, Jennifer L. Hodgson, Mansoor Namazian, Michelle L. Coote

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


A test set of 21 radical addition and 28 hydrogen abstraction reactions has been studied at the Wl, G4, G3X, G3X(MP2), and G3X(MP2)-RAD levels of theory with a view to establishing whether the recently introduced G4 theory offers improved performance over the G3 methods. All methods tested approximated the benchmark Wl values to within a mean absolute deviation (MAD) of 4 kJ mol -1 or less, although maximum absolute deviations for problematic reactions (such as radical addition to thiocarbonyl compounds) can be as much as 10 kJ mol-1 for the G3 methods. The new noncanceling higher-level correction (HLC) term in G4 was found to be capable of mitigating these errors in radical addition, but it introduced a systematic error to the reaction energies of the abstraction reactions, and its format may therefore require re-examination. G3 methods were shown to offer "chemical accuracy" even for these problematic cases, provided they were corrected to the Wl level of theory via an ONIOM-based approach.

Original languageEnglish
Pages (from-to)3690-3697
Number of pages8
JournalJournal of Physical Chemistry A
Issue number15
Publication statusPublished - 16 Apr 2009
Externally publishedYes


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