The precise controllability of the elastic abrasive tool has always been a major problem in the engineering field. Based on the previous experiments, the objectives and scope of the research fit the compression controllability function equation of the elastic abrasive tool based on
MATLAB software. The compression mechanics characteristics of elastic abrasives were analyzed. The reliability of the equations and the tribological properties of elastic abrasives were studied. The results show that the cell size and density of the foamed composite have a great influence
on the compressive mechanical properties and tribological properties of the material. The thickness of the matrix among the holes will determine the elastic resistance of the material and the surface quality of the workpiece to be processed.
Herein, we report a RhI3 catalyzed intramolecular carboamination reaction to access multi-substituted indoles. The protocol features broad substrate scope (>20 examples), great functional group compatibility as well as low catalyst loading (5 mol% Rh). Good to excellent yields (up to 98% yield) were obtained. An unprecedented C-N bond cleavage mode via 6-membered transition state sigma bond metathesis mechanism was proposed based on control experiments. A series of C3-allylated indole derivatives were accessed, which proved to be an alternative catalyst system to synthesize multi-substituted indoles.
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