Abstract
Isotactic poly[methyl α-(hydroxymethyl)acrylate] was prepared via anionic polymerization of the respective monomer protected with trimethylsilyl group (1-TMS) initiated with isopropyl α-lithioisobutyrate (Li-iPrIB) in toluene at −78 °C. The polymerization proceeded in high isotactic specificity similarly to the case of α-(alkoxymethyl)acrylate, although the monomer conversion was low (~18 %) due to the self-terminating reaction accompanying the elimination of trimethylsilanolate anion. The monomer conversion could be improved to ca. 75 % in the polymerizations with an excess amount of LiOSiMe3, which would interact with and stabilize the propagating species to suppress the self-terminating reaction. This was a sharp contrast to the polymerization of α-(methoxymethoxymethyl)acrylate (1-MOM), an acetal protected monomer, where the addition of LiOSiMe3 enhanced the self-termination. Consequently, the structure of protective group affects the polymerization behavior. For the resulting poly(1-TMS), the deprotection by acid hydrolysis quantitatively afforded isotactic poly[methyl α-(hydroxymethyl)acrylate].
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Acknowledgments
The authors would like to thank Nippon Shokubai Co. Ltd. for the kind gift of methyl α -(hydroxymethyl)acrylate. This work was supported by JSPS KAKENHI Grant Number 26810069.
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Kohsaka, Y., Yamamoto, K., Suzawa, K. et al. Synthesis of isotactic poly[α-(hydroxymethyl)acrylate] by anionic polymerization of the protected monomer. Polym. Bull. 74, 1935–1948 (2017). https://doi.org/10.1007/s00289-016-1813-1
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DOI: https://doi.org/10.1007/s00289-016-1813-1