US 11,866,393 B2
7,7′-dihalo-3,3,3′,3′-tetramethyl-1,1′-spirobiindane and preparation method thereof
Xufeng Lin, Hangzhou (CN); Linxi Yao, Hangzhou (CN); Shirui Chang, Hangzhou (CN); and Lei Wang, Hangzhou (CN)
Assigned to Zhejiang University, Zhejiang (CN)
Filed by ZHEJIANG UNIVERSITY, Hangzhou (CN)
Filed on Mar. 22, 2022, as Appl. No. 17/700,500.
Application 17/700,500 is a continuation in part of application No. 16/770,956, granted, now 11,530,230, previously published as PCT/CN2017/116105, filed on Dec. 14, 2017.
Prior Publication US 2022/0213011 A1, Jul. 7, 2022
Int. Cl. C07C 25/22 (2006.01); C07C 17/013 (2006.01)
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:

OG Complex Work Unit Chemistry
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.