Used as a Wittig reagent in organic synthesis, enabling the formation of carbon-carbon double bonds through reaction with aldehydes or ketones. The phosphonium salt facilitates the conversion of carbonyl compounds into alkenes, particularly useful in constructing complex organic molecules with defined double bond positions. Its structure includes a protected aldehyde equivalent in the dioxane ring, allowing for selective deprotection and further functionalization in multi-step syntheses. Commonly applied in pharmaceutical and natural product synthesis where precise alkene geometry is required.