Mesoporous Silica-Supported Sulfonyldiamine Ligand for Microwave-Assisted Transfer Hydrogenation

Table 2

Microwave-assisted transfer hydrogenation in the presence of 3^a.

Entry	Ketone	Ligand	Power (W)	Time (min)	Conv. (%)^b
1		3a	80	30	100
2		3a	60	30	99 (94)^c
3		3a	60	30	95^d
4		3a	50	30	96 (92)^c
5		3a	40	40	93
6		3b	60	40	90
7		3a	60	40	93 (88)^c
8		3a	60	40	90
9		3a	60	25	100
10		3b	60	30	98 (95)^c
11		3a	40	30	95
12		3a	60	35	98

Molar ratio; ketone : Ru : ligand 3 (loading ratio = 0.18 and 0.15 mmoL/g) = (100 : 1 : 3), HCO₂Na (5 equiv.). ^bDetermined by GC analysis. ^cIsolated yield. ^dAfter third use of the catalyst (according to entry 2).