[CH3:1][CH:2]([CH2:10][CH:11]=O)[CH2:3][CH2:4][CH2:5][C:6]([OH:9])([CH3:8])[CH3:7]>CC(C)=O>[CH3:1][CH:2]([CH2:3][CH2:4][CH2:5][C:6]([CH3:7])([OH:9])[CH3:8])[CH2:10][CH:11]=[CH:5][C:6](=[O:9])[CH3:7]Ethynylation of 212 g of 6,10-dimethylundeca-3-en-2-on-10-ol obtained by aldol condensation of hydroxycitronellal and acetone was carried out in the same manner as in example 20 except that hydroxycitronellal was used in place of pseudoionone and 269 g of a crude product was thus obtained.
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