Formaldehyde → 1,3-Propanediol, 2-methyl-2-(1-methylpropyl)-

Temperatur

40 °C

An aqueous NaOH solution (30%, 420 g) was added at room temperature into a stirred mixture of 2,3-dimethyl pentanal (325 g, prepared as above in EXAMPLE II) and aqueous formaldehyde solution (CH2O) (30%, 722 g) while the reaction temperature was allowed to rise up to about 80° C. due to the exothermic reaction. After the addition was completed, the reaction mixture was cooled to about 40° C. The organic phases was separated and fractionally distilled to afford 2-sec-butyl-2-methyl-propane-1,3-diol (277 g). 2-sec-Butyl-2-methyl-propane-1,3-diol was reacted with 2,4-dimethyl-cyclohex-3-enecarbaldehyde to afford 5-sec-butyl-2-(2,4-dimethyl-cyclohex-3-enyl)-5-methyl-[1,3]dioxane according to previous disclosure (See, for example, U.S. Pat. No. 6,444,637).

1. customto rise up to about 80° C. due to the exothermic reaction
2. additionAfter the addition
3. customThe organic phases was separated
4. distillationfractionally distilled

ORD-Eintrag

ord-e15402fe95b447028ec57da5cff0d90b

Quelldatensatz

uspto-grants-2015_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09029576B2