Abstract
As a practical, efficient, easily accessible, low-cost grinding auxiliary, silica gel can break π-π stacking under mechanochemical conditions. This effect could lead to significant rate enhancement and yield in multiple types of reactions which involve linear polyaromatic hydrocarbons. Additionally, in order to deeply understand how grinding auxiliaries behave under mechanochemical conditions, several particles were used in control reactions and different physical properties were determined. The control reactions and the physical properties revealed that the rate enhancement effect of silica gel appear to be based on a combination of surface charge, small particle size, acidity of silica gel and ability to absorb moisture. Among those factors, we think the most important factor is the strong surface charge of silica gel after grinding.
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