Synthesis of 9,9-bis(4-hydroxyphenyl) fluorene catalyzed by bifunctional ionic liquids

Abstract

A series of bifunctional ionic liquids (BFILs) containing sulfonic acid (–SO3H) and sulfhydryl groups (–SH) were synthesized, and their catalytic performance in the condensation reaction of 9-fluorenone and phenol were studied.

Synergistic Catalysts of Lewis Acid and Brønsted Acid for Highly Efficient Preparation of Bisphenol Compounds

“…Then, the intermediate IV was formed under the participation of 3-mercaptopropionic acid . Because of the low steric hindrance of the part of intermediate IV coming from 3-mercaptopropionic acid, it is still the o -carbon of phenoxyethanol that attacks the active center to form BPEF . The fragmentation peaks at 219.9340 and 338.3387 in the MS results partially confirmed the formation of intermediates IV.…”

Polystyrene-supported imidazolium acidic ionic liquids: highly efficient catalysts for the synthesis of bisphenols

“…As an important bisphenol monomer, 9,9-bis(4-hydroxyphenyl)fluorene (BHPF) has a unique cardo-ring structure, which can be used to manufacture polymers with strong rigidity, thermal stability and excellent optical properties. 8,9 Additionally, BHPF-derived functional polymers have shown promise in aerospace, machinery, construction, automotive, electronics and other fields. 10 The synthesis of BHPF by 9-fluorenone and phenol requires an acid catalyst to provide proton and sulfhydryl compounds as co-catalysts to activate fluorenone carbonyl.…”