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- W1564101959 abstract "Abstract Polymerization of 3‐( o ‐formylphenyl)propionaldehyde ( 4 ) and o ‐phenylenediacetaldehyde ( 5 ) were performed with several ionic catalysts. The cationic polymerization of 4 yielded polyacetals which contained a seven‐membered cyclic unit ( 7 ) in mole fractions of 0,3–0,5. The uncyclized unit ( 6 ) contained the pendant aromatic aldehyde. Apparently, the aromatic aldehyde group reacted during the course of the intramolecular cyclization. Polymerizations of 5 with BF 3 ·O(C 2 H 5 ) 2 , lithium tert ‐butoxide, or Al(C 2 H 5 ) 3 ‐TiCl 4 as catalysts, similarly gave polyacetals containing a seven‐membered cyclic unit ( 10 ) in mole fractions of 0,5–0,8. The extent of cyclization decreased with increase in temperature in the cationic polymerization, resulting in a difference of −7,5 kJ mol −1 (−1,8 kcal mol −1 ) between the activation energy of intramolecular cyclization and that of intermolecular propagation. The polymerization with Al(C 2 H 5 ) 3 as catalyst gave a polyester via propagation involving a hydride shift." @default.
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- W1564101959 doi "https://doi.org/10.1002/macp.1974.021751204" @default.
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