CPC C07C 25/22 (2013.01) [C07C 17/013 (2013.01); C07C 2602/08 (2017.05)] | 3 Claims |
1. A 7,7′-dihalo-3,3,3′,3′-tetramethyl-1,1′-spirobiindane, being a compound represented by formula I, or an enantiomer, a raceme or a diastereomer thereof:
wherein R1 is selected from the group consisting of hydrogen, C1-C10 alkyl or perfluoroalkyl, C3-C6 cycloalkyl, aryl or substituted aryl, and heteroaryl or substituted heteroaryl; R2 is selected from the group consisting of hydrogen, C1-C10 alkyl or perfluoroalkyl, and C3-C6 cycloalkyl; wherein the substituted aryl or the substituted heteroaryl has one or more substituents independently selected from the group consisting of halogen, C1-C4 alkyl or perfluoroalkyl, C3-C6 cycloalkyl, C1-C4 alkoxy or perfluoroalkoxy, methylenedioxy, aryl, aryloxy, and heteroaryl; the heteroaryl is C5-C14 heteroaryl; and X is halogen.
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