Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 39648-67-4, C20H13O4P. A document type is Article, introducing its new discovery., Quality Control of: (R)-4-Hydroxydinaphtho[2,1-d:1′,2′-f][1,3,2]dioxaphosphepine 4-oxide
The bulk ring-opening polymerization (ROP) of epsilon-caprolactone (epsilon-CL) by various phosphoric acids using phenylmethanol as the initiator was conducted. 1,1′-bi-2-Naphthol (BINOL)-based phosphoric acid was found to be an effective organocatalyst for ROP leading to polyesters at 90C. The overall conversion to poly(epsilon-caprolactone) was more than 96% and poly(epsilon-caprolactone) with Mw of 8400 and polydispersity index of 1.13 was obtained. 1H NMR spectra of oligomers demonstrated the quantitative incorporation of the protic initiator in the polymer chains and showed that transesterification reactions did not occur to a significant extent. The controlled polymerization was indicated by the linear relationships between the number- average molar mass and monomer conversion or monomer-to-initiator ratio. In addition, the present protocol provided an easy-to-handle, inexpensive and environmentally benign entry for the synthesis of biodegradable materials as well as polyesters for biomedical applications. Science China Press and Springer-Verlag Berlin Heidelberg 2012.
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Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare