Calculated kinetic isotope effects at 298K, R=Ph
R	kH/kD	k12C/k13C=O	k12C/k13C=C	k16O/k18O=C
Ph	4.37	1.019	1.007	0.993
Ph (relay)	1.18	1.043	1.027	1.019
iPr	4.05	1.026	1.0096	1.005
Experiment, doi:chzpgh	2.11

See also another example of opposing primary and secondary isotope effects.