To prevent excessively intense reactions or excessively long reaction times under the boundary conditions of reaction time, the upper and lower limits of superior reaction time are set at 0.1h and 1.5h respectively. As for the boundary conditions of reaction temperature, the temperatures near the room temperature are considered as superior reaction temperatures, while temperatures exceeding the boiling point of water and temperatures requiring artificial cooling are considered as inferior reaction ones.
According to the distribution of reaction yields recorded in the ORD database, it can be observed that most of the reaction yield are distributed between 90% and 100% (Fig. 3) , with only a small portion distributed below 50%. Therefore, we set the upper and lower boundaries for yield as 90% and 50% respectively to enhance differentiation between variations. Furthermore, reactions with notably low yields and reasonably moderate reaction times are also classified as inferior reactions.