  We have revisited the MOBH35 (Metal-Organic Barrier Heights, 35 reactions)
benchmark [Iron, M. A.; Janes, T. J. Phys. Chem. A 2019, 123 (17), 3761-3781;
ibid. 2019, 123, 6379-6380] for realistic organometallic catalytic reactions,
using both canonical CCSD(T) and localized orbital approximations to it. For
low levels of static correlation, all of DLPNO-CCSD(T), PNO-LCCSD(T), and
LNO-CCSD(T) perform well; for moderately strong levels of static correlation,
DLPNO-CCSD(T) and (T1) may break down catastrophically, and PNO-LCCSD(T) is
vulnerable as well. In contrast, LNO-CCSD(T) converges smoothly to the
canonical CCSD(T) answer with increasingly tight convergence settings. The only
two reactions for which our revised MOBH35 reference values differ
substantially from the original ones are reaction 9 and to a lesser extent 8,
both involving iron. For the purpose of evaluating DFT methods for MOBH35, it
would be best to excise reaction 9 entirely as its severe level of static
correlation is just too demanding a test. The magnitude of the difference
between DLPNO-CCSD(T) and DLPNO-CCSD(T1) is a reasonably good predictor for
errors in DLPNO-CCSD(T1) compared to canonical CCSD(T); [...]
