The polymerization of 2,4‐hexadiene

The Polymerization of 2,4-Hexadiene. Stereoregular Polymer and the Mechanistic Study for Its Preparation

“…Ni(acac)2-AlEt2Cl, both with regard to the polymer yield and the preparation of crystalline polymer, was similar to Co(acac);!-AlEt2-Cl in the polymerization of butadiene.2 In the case of 2,4-hexadiene, however, even the polymer obtained from the trans.trans isomer by the former catalyst was amorphous, although both catalysts showed the similar polymerization rate and both polymers obtained were composed of 1,4trans structure (Table II). The polymerization with both catalysts is likely to proceed through the bidentate coordination of monomer since rate of polymerization is similar in both catalysts and the properties of Ni are similar to those of Co. [3][4][5][6][7][8][9][10][11] The difference observed may be due to the irregular structure of monomer unit caused by isomerization of the active end through hydride shift in Ni(acac)2-AlEt2Cl (.3 == 4 5 == 6, Figure 10), because the irregularity is produced by the random distribution of two kinds of trans-1,4 structures and -allyl Ni complex might be more effective than -allyl Co complex in isomerization. [41][42][43][44] Conclusion.…”

On the Cationic Polymerization of 4-Methyl-1-pentene and the Structure of the Product Polymer

“…Figure10. Reaction scheme for the formation of all the structural units identified in cationic poly(4-methyl-l-pentene); = monomer.…”

The Polymerization of 2,4-Hexadiene. III. Cationic Polymerizability of 2,4-Hexadiene Isomers

“…nation and cationic polymerization, but that only an oligomer resulted from anionic polymerization. 3 A consideration of these facts suggested that there may be common factors which terminate the polymerization of acetalazine other than the hydrazine derivative. Thus we tried to polymerize 2,4-hexadiene in order to compare its reactivity with that of acetalazine and found that high polymers were obtainable from coordi-On studying the polymerizability of isomers of this monomer, we noticed that the coordination polymerizability decreased in the order trans-trans> cis-trans > cis-cis isomer and that a crystalline polymer was obtained from the trans-trans isomer,4 while both the cistrans and cis-cis isomers gave only amorphous polymers.…”