ISSN:
0887-624X
Keywords:
ruthenium
;
samarium
;
polyaddition
;
dialdehydes
;
polyester
;
Tishchenko type reactions
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
RuH2(PPh3)4 catalyzed Tishchenko type polyaddition of terephthal-aldehyde gives aromatic polyester (1), which contains three structural units, [OCH2—C6H4—CH2O] (1a), [OCH2—C6H4—CO] (1b), and [CO—C6H4—CO] (1c). 1H-NMR spectrum shows the presence of the three units in a 1 : 2 : 1 ratio. Isophthalaldehyde also undergoes similar polyaddition to give another aromatic polyester (2), while 1,12-dodecanedial gives an aliphatic polyester (3) containing the following structural units: [OCH2—(CH2)10—CH2O] (3a), [OCH2—(CH2)10—CO] (3b), and [CO—(CH2)10—CO] (3c). The above polymers have Mn of 2.7 × 103-5.4 × 103 and Mw of 4.3 × 103 - 9.7 × 103, respectively. Mixtures of terephthalaldehyde and 1,12-dodecanedial produce copolymers, which contain the units 1a-1c and 3a-3c in a random sequence. In the copolymerization, terephthalaldehyde shows a strong tendency to give 1c units, whereas 1,12-dodecanedial predominantly affords 3a units. SmI2 also catalyzes polyaddition of terephthalaldehyde to give the corresponding polyester with Mn of 1.7 × 103 and Mw of 3.7 × 103, respectively. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 1265-1273, 1997
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
