Hydroxypivaldehyde
Hydroxypivaldehyde is the organic compound with the formula HOCH2(CH3)2CCHO. A colorless liquid, it is produced by condensation of formaldehyde and isobutyraldehyde:

CH2O  +  (CH3)2CHCHO  →  HOCH2(CH3)2CCHO
The compound is a rare example of a distillable aldol (3-hydroxyaldehyde). Upon standing, it dimerizes reversibly to the dioxane derivative. Applications
Hydroxypivaldehyde is a precursor to vitamin B5 as is practiced commercially. Hydroxypivaldehyde is also a precursor to neopentyl glycol by hydrogenation:
HOCH2(CH3)2CCHO  +  H2  →  (CH3)2C(CH2OH)2

References

Alkanals
Alcohols