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Geometrical IsomerismStereochemistry

Formula for GI in polyenes ( R−CH=CH−CH=CH−RR-CH=CH-CH=CH-R ) with identical ends?

Expert Answer

Number of GI = 2n−1+2(n/2)−12^{n-1} + 2^{(n/2)-1} (if n is even). For the example (n=2): 21+20=32^1 + 2^0 = 3 (cis-cis, trans-trans, cis-trans).

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