Table 1. Metal-free catalytic hydrogenation of acetone in the presence of various amounts of H₂O.

entry	[Me2CO], M	[1], mol %	[H2O]/[1]	p, bar	t, h	conv, %a	TON
1b,c	0.50	5	0	13	6	99	20
2c	0.29	5	1d	13	70	94	19
3e	0.27	2.5	1	50	39	92	37
4e	0.27	2.5	2	50	84	98	39
5e	0.27	2.5	5	50	108	92	37
6f	0.53	2.5	>1g	50	15	94	38

^aAll conversions measured by ¹H NMR integration.

^bResult taken from Ashley et al.^6a

^c0.2 mmol acetone.

^dAdded as [1·OH₂].

^e4.0 mmol acetone.

^f8 mmol acetone, ACS reagent grade commercial solvent (Sigma-Aldrich).

^gConfirmed by control experiments (see the SI).