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A recent answer of mine involved the synthesis of the following compound:

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I initially assumed the name of this compound to be (Z)-1,1-diphenylbut-2-ene as the butene is the main chain, with two phenyl groups attached to it. However, the preferred IUPAC name seems to be (Z)-but-2-ene-1,1-diyldibenzene, as verified by ChemDraw. Why is this so? I have not encountered the naming of biphenyls in this manner. What rules apply here to give this compound this name?

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  • $\begingroup$ Close, but the preferred IUPAC name is also not (Z)-but-2-ene-1,1-diyldibenzene. You probably have not encountered the naming of biphenyls in this manner because this is not a biphenyl. Also note that even with only one phenyl group, the parent structure of the resulting [(2Z)-but-2-en-1-yl]benzene would not be the butene chain. $\endgroup$ – Faded Giant Jun 3 at 6:07

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