Lanthanum acetate monohydrate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: This example demonstrates the transesterification reaction of dimethyl terephthalate with 1,3-propanediol using lanthanum acetate monohydrate as the transesterification catalyst (50 ppm La based on final polymer) to form bis(3-hydroxypropyl) terephthalate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: This example demonstrates the transesterification reaction of dimethyl terephthalate with 1,3-propanediol using lanthanum acetate monohydrate as the transesterification catalyst (100 ppm La based on final polymer) to form bis(3-hydroxypropyl) terephthalate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: This example demonstrates the transesterification reaction of dimethyl terephthalate with 1,3-propanediol using lanthanum acetate monohydrate as the transesterification catalyst (150 ppm La based on final polymer) to form bis(3-hydroxypropyl) terephthalate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: This example demonstrates the transesterification reaction of dimethyl terephthalate with 1,3-propanediol using lanthanum acetate monohydrate as the transesterification catalyst (50 ppm La based on final polymer) to form bis(3-hydroxypropyl) terephthalate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: This example demonstrates the transesterification reaction of dimethyl terephthalate with 1,3-propanediol using lanthanum acetate monohydrate as the transesterification catalyst (100 ppm La based on final polymer) to form bis(3-hydroxypropyl) terephthalate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: This example demonstrates the transesterification reaction of dimethyl terephthalate with 1,3-propanediol using lanthanum acetate monohydrate as the transesterification catalyst (150 ppm La based on final polymer) to form bis(3-hydroxypropyl) terephthalate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: This example demonstrates the transesterification reaction of dimethyl terephthalate with 1,3-propanediol using lanthanum acetate monohydrate as the transesterification catalyst (150 ppm La based on final polymer) to form bis(3-hydroxypropyl) terephthalate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The 1,2-diamino-3-(4-aminophenyl)propane (1.0 mmol), is added dropwise, with stirring, to a reaction vessel containing lanthanum(III) acetate hydrate (0.343 g, 1.0 mmol) in 50 mL of anhydrous methanol. The resultant mixture is stirred at room temperature for 15 min; the dicarbonyl dipyridine-three-quarter-cycle (0.354 g, 1.0 mmol) is then added and the mixture is heated under reflux conditions for 14 hours. The orange colored solution thereby produced is filtered to remove any unreacted lanthanum acetate and is evaporated to dryness under reduced pressure at 60° C. in a rotary evaporator. The residue is worked up in diethylether to yield a solid product, which is purified by repeated crystallization from chloroform-diethylether, until the IR and NMR (1H and 13C) spectra show the presence of the pure macrocyclic complex. the mixture is heated under reflux conditions for 14 hours The orange colored solution thereby produced is filtered to remove any unreacted lanthanum acetate is evaporated to dryness under reduced pressure at 60° C. in a rotary evaporator to yield a solid product, which is purified crystallization from chloroform-diethylether

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The triamine trihydrochloride of 4-aminophenylalanine (0.188 g, 0.65 mmol) was dissolved in 15 mL of anhydrous methanol, and solid potassium hydroxide (0.89 g, 0.44 mmol), was added to the solution. The resultant suspension was stirred at room temperature for 1 hour, and thereafter refrigerated overnight. The suspension was filtered, the solid (potassium chloride) was discarded, and the clear pale yellow filtrate was added dropwise, with stirring, to a reaction vessel containing lanthanum(III) acetate hydrate (0.110 g, 0.32 mmol) in 40 mL of anhydrous methanol. The resultant mixture was stirred at room temperature for 15 min and then 2,6-diacetylpyridine (0.104 g, 0.65 mmol) was added. The mixture was heated under reflux conditions for 14 hours; the orange colored solution thereby produced was filtered to remove a small amount of unreacted europium acetate and evaporated to dryness under reduced pressure at 60° C. in a rotary evaporator. The gummy residue was repeatedly worked up in diethyl ether, ultimately yielding a solid product. This solid was taken up in warm chloroform and filtered. The insoluble residue was discarded, and the yellow-orange filtrate was gradually diluted with diethylether and chilled. The precipitate thus formed was filtered, dissolved in anhydrous methanol, and added dropwise with stirring to approximately 300 mL of chilled anhydrous diethylether. The pale yellow powdery solid thus formed was filtered off, washed with diethylether, and dried in vacuo over phosphorous pentoxide. Yield: 58%. Microanalysis and spectral data (IR, 1H and 13C NMR) confirmed the structure and purity of the product. refrigerated overnight The suspension was filtered the clear pale yellow filtrate was added dropwise The mixture was heated under reflux conditions for 14 hours the orange colored solution thereby produced was filtered to remove a small amount of unreacted europium acetate evaporated to dryness under reduced pressure at 60° C. in a rotary evaporator ultimately yielding a solid product filtered the yellow-orange filtrate was gradually diluted with diethylether chilled The precipitate thus formed was filtered dissolved in anhydrous methanol added dropwise with stirring to approximately 300 mL of chilled anhydrous diethylether The pale yellow powdery solid thus formed was filtered off washed with diethylether dried in vacuo over phosphorous pentoxide

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: This example demonstrates the transesterification reaction of dimethyl terephthalate with 1,3-propanediol using lanthanum acetate monohydrate as the transesterification catalyst (50 ppm La based on final polymer) to form bis(3-hydroxypropyl) terephthalate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: This example demonstrates the transesterification reaction of dimethyl terephthalate with 1,3-propanediol using lanthanum acetate monohydrate as the transesterification catalyst (100 ppm La based on final polymer) to form bis(3-hydroxypropyl) terephthalate.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: This example demonstrates the transesterification reaction of dimethyl terephthalate with 1,3-propanediol using lanthanum acetate monohydrate as the transesterification catalyst (150 ppm La based on final polymer) to form bis(3-hydroxypropyl) terephthalate.