Al(OR^F)₃ (R^F = C(CF₃)₃) activated silica: a well-defined weakly coordinating surface anion.

ABSTRACT: Weakly Coordinating Anions (WCAs) containing electron deficient delocalized anionic fragments that are reasonably inert allow for the isolation of strong electrophiles. Perfluorinated borates, perfluorinated aluminum alkoxides, and halogenated carborane anions are a few families of WCAs that are commonly used in synthesis. Application of similar design strategies to oxide surfaces is challenging. This paper describes the reaction of Al(OR^F)₃*PhF (R^F = C(CF₃)₃) with silica partially dehydroxylated at 700 °C (SiO_2-700) to form the bridging silanol [triple bond, length as m-dash]Si-OH⋯Al(OR^F)₃ (1). DFT calculations using small clusters to model 1 show that the gas phase acidity (GPA) of the b

SUBMITTER: Culver DB 

PROVIDER: S-EPMC8148071 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature