Procedure for constructing acyclic chemical networks is delineated through the example of polyenoids, CNHN+2. Chirality in two-dimensional space is introduced to enumerate polyenoids. Cis−trans dichotomies, each arising from a 2D chiral center, are stacked to form stereoisomers. Redundancy caused by rotating the molecular plane in 3D space is eliminated to obtain the net count of isomers.
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Chin-yah Yeh (1996) studied this question.
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