By Hassler J.W.

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35 Hz). 12. 67. U V X „ nm (e): 272 (1250). 0 g, 12 mmol) as above. M / M = 94,200/66,400, T = 25 °C. 35 (d, 12H, J = 7 Hz). 13. 15. U V X „ nm (e): 271 (1330). 9 mmol). The color of the reacting solution was brown. After 12 h at 100 °C, color of the solution had become red. The copolymer was dissolved in a minimum amount of THF and was precipitated three times with methanol. 35, T = -55 °C was obtained. 32 (s, 4H). 68. 63. UVXmax nm (e): 247 (959). TGA: polymer is stable to 300 °C. Between 300 to 500 °C, catastrophic decomposition occurs; 90% of weight is lost.

After a non-aqueous work-up, the product was purified by fractional distillation. 1 mm, 15 g, 82% yield was obtained. 00 (sept. 5 Hz). 53. 16. 5 g, 114 mmol). After filtration, the product was purified by fractional distillation. 2 mm, 80% yield was isolated. 02 (sept. 5 Hz). 34. 33. IR v: 2139 Si-H, 1656 C O cm" . UV X nm (s): 269 (1430). 0 g, 15 mmol). M / M = 119,000/57,800, T = -10° C. ch002 3 3 4 n g l 13 29 1 m a x 3 ! ; ACS Symposium Series; American Chemical Society: Washington, DC, 2000.

44. Apparently the two silicon atoms fortuitously have identical chemical shifts. IR v: 1649 cm" . C O . U V X ^ run (e): 374 (6300), 301 (7900), 359(39200). Synthesis of II by acid catalyzed equilibration polymerization of HI. 56 g), mestylene (1 mL) and triflic acid (1 jiL) were pleaced in a 5 mL round bottomed flasked equipped with a Teflon covered magnetic stir bar. The reaction was stirred at rt for 16 h. Hexamethyldisiloxane was continuously removed under vaccum. After neutralization with hexamethyldisilazane and an aquous work-up, the polymer was dissolved in a minimuym amount of THF and was purified by 1 3 C 31 P P ?

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