[CH2:1]([OH:12])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH3:11].[CH3:13][O-].[Na+]>CO>[CH3:13][CH:2]([CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH2:10][CH3:11])[CH2:1][OH:12]Another synthesis starts from n-undecanol, which is reacted with methanol in the presence of sodium methylate. 2-methyl-undecanol is formed, which is then dehydrogenated to form the aldehyde. (Chemical Abstracts Vol. 74 [1971], 12552 X.)
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