Porphyrin-quinone molecules synthesis

C-P-Q Triad Molecules. As discussed above, the natural reaction center has solved the problem of energy loss due to rapid charge recombination by employing a multistep electron transfer strategy. The same strategy may be applied to the porphyrin-quinone type systems. As we pointed out in 1982 [28], this requires the addition of a secondary electron donor or acceptor moiety. This strategy came to fruition in 1983 when we reported the synthesis of carotenoid-porphyrin-quinone (C-P-Q) triad 2 [29, 30]. This molecule features porphyrin and quinone moieties similar to those found in 1, but a... 

Synthesis. The structural units in the triads and dyads were linked via amide bonds. There are two alternative routes for constructing the triad molecules couphng the quinone moiety with the porphyrin followed by joining the dyad with the carotenoid polyene, or coupling the porphyrin with the carotenoid polyene and then attaching the quinone. The first approach was used in each of the following examples. 

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