Ethyl bromoacetate → (+/-) ethyl (E)-4-[2-(5,6,7,8-tetrahydro-5,5-dimethyl-8-hydroxy-8-(carbethoxymethyl) naphthalen-2-yl)ethenyl]benzoate

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C1C2C(CC=CC=2)CCC1=O.C1C2C(=CC=CC=2)CCC1.[CH3:22][C:23]1([CH3:47])[CH2:32][CH2:31][C:30](=[O:33])[C:29]2[CH:28]=[C:27](/[CH:34]=[CH:35]/[C:36]3[CH:46]=[CH:45][C:39]([C:40]([O:42][CH2:43][CH3:44])=[O:41])=[CH:38][CH:37]=3)[CH:26]=[CH:25][C:24]1=2.Br[CH2:49][C:50]([O:52][CH2:53][CH3:54])=[O:51]>[Zn]>[CH3:47][C:23]1([CH3:22])[CH2:32][CH2:31][C:30]([OH:33])([CH2:49][C:50]([O:52][CH2:53][CH3:54])=[O:51])[C:29]2[CH:28]=[C:27](/[CH:34]=[CH:35]/[C:36]3[CH:37]=[CH:38][C:39]([C:40]([O:42][CH2:43][CH3:44])=[O:41])=[CH:45][CH:46]=3)[CH:26]=[CH:25][C:24]1=2