Anthracene, perhydro

The CD of all trans-fused ketones belonging to the perhydro-naphthalene, -anthracene, -naphthacene and -phenanthrene has been reported. These studies provided the pure ring... 

A further prospect for these derivatives originates with the substituted enones (161) and (162) (Scheme 38) which are expected to give the Diels-Alder adducts (194) and (198) respectively. The latter is of particular interest since conversion of the pyranose into a cyclohexane ring (see for example Schemes 35—37), would afford the decalone (199) cis or trans) which has the proper absolute stereochemistry for the A and B rings of the majority of terpenes. Furthermore, the functionalization of (199) makes it a synthon of the perhydrophenanthrene (200) and perhydro-anthracene (201) skeletons. 

The conformations of cis- and /ro >decalin, and of four perhydro-anthracenes (PHA) have been studied " the results are summarized in Table 10. 

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