Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 2432-99-7, Name is 11-Aminoundecanoic acid, SMILES is NCCCCCCCCCCC(O)=O, belongs to amides-buliding-blocks compound. In a document, author is Shin, Dong Hee, introduce the new discover, Quality Control of 11-Aminoundecanoic acid.
H-bonding binary organocatalysis promoted amine-initiated ring-opening polymerizations of lactide from polysarcosine to diblock copolymers
Alcohol-initiated ring-opening polymerization (ROP) of cyclic esters for synthesizing polyesters was well established, but amine-initiated ROP of cyclic esters was rare. A challenge is slow initiation and fast propagation in the amine-initiated ROPs. To address the difficulties, an ionic H-bond donor (iHBD) and H-bond acceptor (HBA) binary organocatalysis in amine-initiated ROP of lactide (LA) was developed. Guanidinium hexahydro-2H-pyrimido [1,2-a] pyrimidin-1-ium [(HppH(2))(+)] and tertiary amine sparteine (SP), cooperatively played the role of iHBD/HBA binary catalysts, efficiently promoted ROP of LA from amine initiators toward polylactide (PLA) and polysarcosine-block-polylactide diblock copolymer (PSar-b-PLA). Benzyl amine and N-methylbenzylamine initiated ROPs of LA under mild conditions produced PLAs with predictable molecular weights (M-n,M-NMR = 2.9-17.1 kg mol(-1)) and narrow dispersities (D-M,D-SEC = 1.13-1.23). Macroinitiator PSar copolymerized with LA under the iHBD/HBA catalysis, producing PSar-b-PLAs with controlled molecular weights (M-n,M-NMR = 5.7-14.8 kg mol(-1)) and low dispersities (D-M,D-SEC = 1.16-1.21). Kinetics and chain extension experiments confirmed that the amine-initiated ROP of LA in presence of (HppH(2))+BE4-/SP was in controlled/living manner. H-1 NMR, C-13 NMR, SEC, and MALDI-ToF MS analyses indicated that the obtained PLA was exclusively initiated from the corresponding amine with amide linkage. An iHBD/HBA binary activation mechanism was proposed.
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 2432-99-7 is helpful to your research. Quality Control of 11-Aminoundecanoic acid.