prov:value
| - Possible catalysts are in particular organic acids, inorganic acids, alkali metals, such as sodium and potassium, tertiary amines, alkyl aluminum and its derivatives, such as triethyl aluminum, alkoxy titanium compounds, such as tetrabutyl titanate, organometallic compounds such as stannous octoate and dibutyl tin dilaurate, and metal halogenides, such as tin chloride.
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