Table 3. Optimization of Co/NC catalysed cyclopropanation of styrene and EDA.

Entry	Catalyst	Yield	Selectivity	Trans : cis ratio
1	Co0/NC-900	∼a	∼	∼
2	Co0.25/NC-900	79%	99	75 : 25
3	Co0.5/NC-900	85%	99	77 : 23
4	Co0.75/NC-900	24%	86	68 : 32
5	Co1.0/NC-900	18%	80	72 : 28
6	Co0.5Zn0.5-ZIF	∼	∼	∼
7b	Co0.5/NC-100′	2	23	48 : 52
8b	Co0.5/NC-250′	17	85	69 : 31
9b	Co0.5/NC-550′	33	87	72 : 28
10b	Co0.5/NC-900′	9	84	65 : 35

^a∼Means no target product was detected.

^bCo/NC catalyst prepared using the impregnation method.