Electric Literature of 31181-90-5, The transformation of simple hydrocarbons into more complex and valuable products via catalytic C–H bond functionalisation has revolutionised modern synthetic chemistry. 31181-90-5, Name is 5-Bromopicolinaldehyde, SMILES is O=CC1=NC=C(Br)C=C1, belongs to pyridine-derivatives compound. In a article, author is Takeuchi, Suzuka, introduce new discover of the category.
Facile rare-earth triflate-catalyzed esterification of cellulose by carboxylic anhydrides under solvent-free conditions
We report here the facile rare-earth triflate-catalyzed esterification of cellulose by carboxylic anhydrides, including acetic anhydride, at room temperature under solvent-free conditions. As a model, D-glucose was peraceylated using only equimolar amounts of acetic anhydrides against hydroxyl groups to give the expected 1,2,3,4,6-pentaacetyl alpha-D-glucopyranoside (crude yield 98%, 68% yield after recrystallization) under solvent-free condition. In the case of powdery micmcrystalline cellulose, acetylation proceeded both in the absence of pyridine and solvent to give peracetylated cellulose, even in the bulk. From H-1 NMR measurements, the degree of substitution (DS) was 3.0 (100% acetylation) and we concluded that Sc(OTf)(3) -catalyzed solvent-free esterification of cellulose had taken place. The number-average molecular weight (M-n), calculated using the H-1 NMR intensity ratio based on the anomeric proton in the reducing terminus, was 1.7 x 10(4) (repeating unit of pyranose unit: 56).
Electric Literature of 31181-90-5, Because enzymes can increase reaction rates by enormous factors and tend to be very specific, typically producing only a single product in quantitative yield, they are the focus of active research.you can also check out more blogs about 31181-90-5.
Reference:
Pyridine – Wikipedia,
,Pyridine | C5H5N – PubChem