Fig. 4
Recycle and confinement effect. a Recycling tests of the HOF 1-Ni catalyst in the [3+2] coupling reaction of 3-methyl indole with quinone monoamine. b Plots of the [3+2] coupling reaction of 3-methyl indole with quinone monoimine at different catalyst loadings (catalyst loadings of Me4L and 1-Ni* are 6 and 0.75 times of HOF 1-Ni, respectively)
