4- Bromophenyl trimethylsilyl ether

Bromocyclohexene, 26 Bromodesilylation, 41 m-Bromodimethylaniline, 40 ft Bromoketones, 77-8 Brumoketones, 55 2-Bromophenyl trimethylsilyl ether, 41... 

Bromophenyl trimethylsilyl ether, 41 a-Bromovinyl(triphenyl)silane, 69 Brook rearrangement, 83-4 t-Butoxide-cntalysed condensation, 43 (/ )-4-t-Butyl l-(trimethylsilyloxy)-... 

As mentioned already in the polymerization of meth of-phenylacrylate a steri-cally random pdymer was obtained. However, the fraction of heterotactic triad in the polymer did not exceed 50 % under any polymerization conditions with BuLi Initiator (Table 10). On the other hand, methyl a-(p-bromophenyl)acrylate and methyl ce-(p-chlorophenyl)acrylate gave the polymers whose heterotactic contents were 59 and 61 %, respectively, in THF by BuLi at -78 (Table 10). The tacticity was determined by the C-NMR spectra of poly(2-phenylallyI acetate)s derived from the original polymers via pdy(2-phenylallyl alcohol)s. The bulkiness of the o-substituent seems to be important for the heterotactic propagation in these cases, as pointed out by Nozakuia et al. in the formation of heterotactic poty(vinyl alcohol) derived from poly(vinyl trimethylsilyl ether). However, method o-phenylacrylate formed a heterotactic pdymer whose heterotactic content was 66 %, by octylpotassium in THF (Table 10),... 

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