11. This property makes them both excellent nucleophiles " and " lewis bases ( electron pair doners ). 12. With simple Lewis bases ( L ), Al 2 Br 6 forms adducts, such as AlBr 3 L. 13. (bda ) Fe ( CO ) 3 reacts with Lewis bases to give adducts without displacement of the bda. 14. It is a moderately strong Lewis acid, forming adducts with Lewis bases such as triphenylphosphine oxide, e . g. 15. However, they are Lewis acids, because they accept electron pairs from some Lewis bases , most notably base anhydrides. 16. Otherwise ( C 6 F 5 ) 3 B binds to a wide range of Lewis bases , even weak ones. 17. Ethyl acrylate reacts with amines catalyzed by Lewis bases in a Michael addition to ?-alanine derivatives in high yields: 18. These compounds are Lewis acids in that they readily form adducts with electron-pair donors, which are called Lewis bases . 19. Electron donors ( e . g . nucleophiles, Lewis bases ) for example dimethylsulfide and dimethylsulfoxide are believed to stabilize the carbocation. 20. However, they are Lewis bases , because they will share an electron pair with some Lewis acids, most notably acidic oxides.
