Bridged-Ring Carbocyclic Structures

Phanes are compounds with at least one aromatic nucleus and at least one bridge 28 Such structures can incorporate a great number of arenes — carbophanes contain carbocycles such as benzene or naphthalene, heterophanes heteroaromatic rings including metallocenes — and a wide variety of bridges spanning the ring (s) in different positions from one to several simple alkylidene residues (e.g. hexamethylene or... 

In order to facilitate comparisons between different rings systems, the base components indene, indacene, pentalene, and naphthalene have been chosen for the design of the carbocyclic pattern of the tricyclic assembly (Table 2). Of these broad classes of structures, [/lannelated- (1), [e]annelated-(5), [a]annelated- (2), and [c,d]annelated-indenes (6) have been the most completely explored, less being known of (l,4)-methano-naphthalenes (7), while [c]annelated- (3), [bridged systems (8-10) and the (3a,6a)-butano-pentalenes (11) have been scarcely mentioned, if at all, in CHEC-I. 

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