有機マグネシウム化合物-四塩化チタン系触媒によるイソプレンの重合

概要

論文の詳細を見る
Magnesium metal was found to react fairly rapidly with halogenobenzenes under sufficiently anhydrous conditions to give soluble organomagnesium compounds in good yields. The organomagnesium compounds so obtained showed empirical formulas whose halogen contents decreased in the order of Cl>Br>I.<BR>Isoprene was polymerized using the catalyst system composed of the above organomagnesium compounds and titanium tetrachloride. When the molar ratio of organomagnesium compound to titanium tetrachloride (Ar-Mg/Ti) was above 2, high <I>cis</I>-1, 4-polyisoprenes were obtained. At the Ar-Mg/Ti ratio below 2, however, powderly polymers containing cyclic structures were formed in low yields.<BR>The extent of reduction of titanium tetrachloride with the magnesium components was also determined in relation to the Ar-Mg/Ti ratio.