Three strategies (additive, chiral auxiliary or chiral reagent) were developed to improve the diastereoselectivity or enantioselectivity of the ylide cyclopropanation reactions.
"Jinbiao"CMC is the widely used additive, in paper industry because it mainly has membrane and oil-resislance capability as water soluble superpolymer.
The enantioselectivity of N-dodecanoyl-L-proline-3,5-dimethyl-anilide is also good, but the basic line fluctuates strongly due to containing benzene ring in its molecular structure.
Besides that, prop-1-ene-1,3-sultone is a kind of electrolyte additive, which can effectively restrain ion battery from expanding under the condition of high temperature.
The influence of some common food additives on the stability of cryptoflavin ,and the resistance of cryptoflavin to heat ,light,oxidation and reduction were investigated.