Table 1.

Chemoselective hydrogenation of 3-nitrostyrene using different catalysts.

Entry	Catalyst	Conversion (%)	Selectivity for 3-vinylaniline (%)	Selectivity for 3-ethylnitrobenzene (%)	Selectivity for 3-ethylaniline (%)
1	Au-3 nma	15.4	78.3	16.0	5.7
2	Au-9 nmb	14.9	38.9	51.4	9.7
3	Au-3 + 9 nmc	24.8	54.7	45.3	0
4	Au-3+9nm-H400c	28.3	96.1	3.9	0
5	Au-3nm-H400a	12.0	95.5	4.5	0
6	Au-9nm-H400b	3.5	100	0	0

Reaction conditions: T = 110 °C, $P_{{\mathrm{H}}_2}$ = 1.0 MPa, reacted for 4 h.

^a40 mg of catalyst (Au loading of 0.51%).

^b20 mg of catalyst (Au loading of 1.45%).

^c20 mg of catalyst (total Au loading of 1.46%).