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Our new synthesis of octakis(3-chloropropyl)octasilsesquioxane ( 1 ) is based on a two-stage hydrolytic condensation of 3-chloropropyltrimethoxysilane. This enables the selective formation of the desired product more rapidly (4 days), in comparison to methods used to date (5 weeks), while the yield (35%) is comparable. The process is conducted in methanolic solution, with the first stage being acid hydrolysis and the second stage condensation in the presence of di- n -butyltin dilaurate as a catalyst.
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Marciniec et al. (2008) studied this question.
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