Abstract: The present invention discloses a nucleophilic acyl substitution-based polymerization catalyzed by mononuclear oxometallic complexes. In the first place, the first monomers with a plurality of carboxyl groups, and the second monomers with a plurality of protic nucleophilic groups are provided, wherein the protic nucleophilic groups comprise hydroxyl, amine, or thiol group. Next, catalyzed by the mentioned mononuclear oxometallic complex, the first monomers and the second monomers are polymerized into the designed polymer. On the other hand, this invention discloses another nucleophilic acyl substitution-based polymerization catalyzed by mononuclear oxometallic complexes. In the first place, monomers with at least one carboxyl (phosphonyl) group and at least one masked protic nucleophilic group are provided. Then, monomers are polymerized into the designed polymer, catalyzed by the mentioned mononuclear oxometallic complexes.

Abstract: The present invention discloses a cellulose based optical film material with the following structure: wherein R1 is —H or —C(O)R4, R4 is alkyl or aryl; R2 is —C(O)R5, R5 is alkyl or aryl; R3 comprises one of the group consisting of: phosphinate based group, phosphonate based group, phosphonamide based group, phosphate based group, phosphoramide based group, carbamate based group, carbonate based group, and ester based group. Further, this invention also discloses a method for forming the cellulose based optical film material.

Abstract: The present invention discloses a method of nucleophilic acyl substitution (NAS) of carboxylic acids or esters (hereinafter acids/esters) catalyzed by oxometallic complexes. According to the mentioned method, NAS reactions between acids/esters (R1COOH/R1—COO—R2) and protic nucleophile (R3-AH) can be catalyzed by oxxmetallic complexes, wherein A stands for O, S, or NH. The general formula of the mentioned oxometallic complexes is MOmL1yL2z, wherein M is selected from IVB, VB, VIB or actinide groups, m, y, z are integers, and m, y?1, z?0.

Abstract: The present invention discloses a nucleophilic acyl substitution-based polymerization catalyzed by oxometalic complexes. In the first place, the first monomers with a plurality of carboxyl groups, and the second monomers with a plurality of protic nucleophilic groups are provided, wherein the protic nucleophilic groups comprise hydroxyl, amine, or thiol group. Next, catalyzed by the mentioned oxometallic complex, the first monomers and the second monomers are polymerized into the designed polymer. On the other hand, this invention discloses another nucleophilic acyl substitution-based polymerization catalyzed by oxometallic complexes. In the first place, monomers with at least one carboxyl (phosphonyl) group and at least one masked protic nucleophilic group are provided. Then, monomers are polymerized into the designed polymer, catalyzed by the mentioned oxometallic complexes.

Abstract: The present invention discloses a method of nucleophilic acyl substitution (NAS) of anhydrides catalyzed by oxometalic complex. According to the mentioned method, NAS reaction between anhydride(s) and highly functionalized protic nucleophile can be catalyzed by oxometallic complexes, wherein the oxometallic complexes compris the metals selected from IVB, VB, and VIB groups.

Abstract: A process for acyl substitution of an anhydride with an active-hydrogen-containing compound includes reacting the anhydride with the active-hydrogen-containing compound in the presence of a vanadyl salt catalyst to obtain a high yield of acyl substitution reaction product with high chemoselectivity.