Sustainable polyacetals from isohexides
Literature Information
B. S. Rajput, S. R. Gaikwad, S. K. Menon, S. H. Chikkali
A single step synthetic protocol to access a small family of renewable diacetals was established. The resultant chiral diacetals are valuable building blocks in pharmaceuticals and materials science. To demonstrate their synthetic competence, isohexide-diacetals (2a–c) were subjected to acetal metathesis polymerization and the corresponding polymers (poly2a–c) were isolated as white solids with molecular weights in the range 3200–27 600 (g mol−1). The semi-crystalline polymers displayed glass transition temperatures between 38–65 °C and melting temperatures in the range 103–156 °C. The isohexide derived polyacetals are stable under practical washing and rinsing conditions but degrade in slightly acidic media.
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![(3R,4aR,7aS,9aR,10S,11R,13aR,13bS,15aS,15bR)-3,11-Dihydroxy-10-(hydroxymethyl)-4,4,7a,10,13a,15b-hexamethyl-1,2,3,4,4a,7,7a,8,9,9a,10,11,12,13,13a,13b,14,15,15a,15b-icosahydro-5H-naphtho[2',1':4,5]cyc
lohepta[1,2-a]naphthalen-5-one structure (3R,4aR,7aS,9aR,10S,11R,13aR,13bS,15aS,15bR)-3,11-Dihydroxy-10-(hydroxymethyl)-4,4,7a,10,13a,15b-hexamethyl-1,2,3,4,4a,7,7a,8,9,9a,10,11,12,13,13a,13b,14,15,15a,15b-icosahydro-5H-naphtho[2',1':4,5]cyc
lohepta[1,2-a]naphthalen-5-one structure](https://static.chemtradehub.com/structs/538/53800-21-8-9f18.webp)