Liu, Fei published the artcileSynthesis of vanillin propylene glycol acetal catalyzed by solid superacid, Synthetic Route of 68527-74-2, the publication is Jingxi Huagong (2010), 27(2), 155-159, database is CAplus.
The synthesis of vanillin propylene glycol acetal catalyzed by solid superacid was investigated. A series of solid superacids were prepared and used to synthesize vanillin propylene glycol acetal. Solid superacids excelled phosphoric acid and citric acid, and SO42-/ZrO2 was the best catalyst. The optimum conditions using SO42-/ZrO2 were as follows: when vanillin was 0.05 mol, n(vanillin):n(1,2-propylene glycol)=1:2.4, the water-carrying agent was toluene (20 mL); the amount of catalyst was 0.25% of the weight of vanillin; and the reaction time 1.0 h. Under these conditions, the yield of vanillin propylene glycol acetal was 95.1%. The total yield was 90.5% and the relative mass fraction was 99.5% after vacuum distillation The structure of the product was identified by IR and GC-MS. The yield could still achieve 91.1% when the catalyst was calcined 20 days later. The reaction time was short and the catalyst was efficient and stable. The post-processing was simple in this process.
Jingxi Huagong published new progress about 68527-74-2. 68527-74-2 belongs to dioxole, auxiliary class Dioxolane,Benzene,Phenol,Ether, name is 2-Methoxy-4-(4-methyl-1,3-dioxolan-2-yl)phenol, and the molecular formula is C11H14O4, Synthetic Route of 68527-74-2.
Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem