prov:value
| - In the above general formular, M is titanium or zirconium, R' is a substituent such as an ethyl group, an amyl group, a phenyl group a vinyl group, a p-(3, 4-epoxycyclohexyl group), ??-mercaptopropyl group, or an aminoalkyl group, R2 is usually an alkoxy group having from 1 to 8 (for instance, a methoxy group, an ethoxy group, a n-propoxy group, an isopropoxy group, a n-butoxy group, an isobutoxy
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