prov:value
| - enyl, C2-C40 alkynyl, C3-C8 cycloalkyl, aryl, aralkyl, or halo; or [0099] R1 and R2, together with the carbon atoms to which they are attached, link to form a fused C3-C8 cycloalkyl or aryl group; [0100] R3 is H, C1-C20 alkyl, C2-C40 alkenyl, C2-C40 alkynyl, C3-C8cycloalkyl, aryl, aralkyl, or halo; and [0101] n is 1 to 5. [0102] In some preferred embodiments, M is a trivalent metal such as Al or G
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