PorPhYrinogen (5) to (6)* phPin-IX ( ' 1 produced enzpically four bridges gave four separate 13C n.m.r. signals. labelled PBG also holds true for uroporphyrinogen-I11 Earlier work had shown that the dimethyl ester of , .

No abstract

A simple and efficient synthetic route to either enantiorneric form of campherenone and epicampherenone [the epimeric 1.7-dimethyl-7-(4-methylpent-3-enyl) norbornan-2iones], p-santalene and epi-P-santalene [Z-methyl-3-methylene-2-(4-methylpent-3-enyl)norbornanes], and the perhydro-1.4-rnethanoindene derivatives copacamphor, copacamphene, ylangocamphor, and sativene is described. The simplicity of the synthetic route is due to the application of a general synthetic plan and the development of a new process for effecting direct 8-substitution of camphor.

No abstract

No abstract