Spiro compounds

摘要

Novel spiro compounds represented by the general formula (|) wherein A<1> and A<2> are each an optionally substituted benzene ring; E is a divalent chain hydrocarbon group which may be substituted; X is CO or the like; R<1> is an optionally substituted hydrocarbon group or the like, or alternatively R<1> may be bonded to a ring-constituting carbon atom of A<2> to form a fused ring; and symbol •••• represents a single or double bond.