Patent ID: 11866393

Abstract:
Disclosed are 7,7′-dihalo-3,3,3′,3′-tetramethyl-1,1′-spirobiindane and a preparation method thereof. The 7,7′-dihalo-3,3,3′,3′-tetramethyl-1,1′-spirobiindane is a compound represented by formula I, or an enantiomer, a raceme or a diastereomer thereof. The compound of formula I could be prepared by using a racemic or optically active 3,3,3′,3′-tetramethyl-1,1′-spirobiindane-6,6′-diol as a raw material through a series of reactions. The 7,7′-dihalo-3,3,3′,3′-tetramethyl-1,1′-spirobiindane is a key intermediate for preparing 3,3,3′,3′-tetramethyl-1,1′-spirobiindane-based phosphine ligand compounds represented by formula II or III.