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Oxidation of the starting aldehyde 1 led to the acid 6 which was esterified in neutral conditions to give the esters 7–11. A Wittig reaction with 1 and various phosphoranes led to compounds 12–15 bearing a functionalized unsaturated side chain. Acidic hydrolysis of 15 gave the aldehyde 16 homologue of 1. Ketone 19 was obtained by Grignard reaction between 1 and the bromoacetal 17 followed by oxidation...
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