Helical poly(alkylalkoxyphenylsilane)s bearing enantiopure chiral groups on the phenyl rings

Macromolecules

Volumn 32, Issue 22, 1999, Pages 7707-7709

  Nakashima, Hiroshi ^a   Fujiki, Michiya ^a   Koe, Julian R ^a  

^a Kashino Diverse Brain Research Laboratory of NTT Communication Science Laboratories   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

FLUORESCENCE; GEL PERMEATION CHROMATOGRAPHY; MOLECULAR STRUCTURE; MOLECULAR WEIGHT; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; OPTICAL PROPERTIES; POLYSTYRENES; SYNTHESIS (CHEMICAL); ULTRAVIOLET SPECTROSCOPY;

CIRCULAR DICHROISM; POLYALKYLALKOXYPHENYLSILANES; TETRAHYDROFURAN;

POLYSILANES;

EID: 0033517628     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma9911804     Document Type: Article

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31. 3 solution referenced to external TMS.
32. The polymerization of the purified dichlorosilanes was performed according to the conventional Wurtz-type condensation as follows. The synthesis of 1 is representative. To a mixture of 16 mL of dry toluene, 1.3 g (0.06 mol) of sodium dispersion, and surface-activated by diglyme (10 μL), 4.0 g (0.014 mol) of methyl-m-(S)-2-methylbutoxyphenyldichlorosilane was added dropwise in an argon atmosphere. The mixture was stirred slowly at 110 °C, monitoring the molecular weight periodically. After 2 h, 0.1 equiv of trimethylchlorosilane was added as terminator, and stirring continued for a further 30 min and then cooled to room temperature. The mixture was hydrolyzed with ethanol and water. The organic layer was separated and washed with water. After the solvent was removed, the remaining crude polymer was reprecipitated from toluene-ethanol solution. The high molecular weight fraction was obtained as a white powder, separated by centrifugation, and vacuum-dried in an oven at 90 °C for 5 h. The yields and some properties of polysilanes 1-4 obtained in this work are summarized in Table 1.
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