4846-23-5Relevant articles and documents
-
Cherbuliez et al.
, p. 841 (1951)
-
Controlled/living ring-opening polymerization of ε-caprolactone catalyzed by phosphoric acid
Chen, Chun Xia,Xu, Rong,Li, Bin
, p. 1257 - 1262 (2012/11/13)
The bulk ring-opening polymerization (ROP) of ε-caprolactone (ε-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 90°C. The overall conversion to poly(ε-caprolactone) was more than 96% and poly(ε-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.
Organophosphorus Antioxidants. II. Kinetics and Mechanism of the Decomposition of Alkylhydroperoxides by Esteramides of Phosphorous and Phosphoric Acid
Rueger, C.,Arnold, D.,Schwetlick, K.
, p. 706 - 716 (2007/10/02)
The reaction mechanism of 2-amido-1,3,2-benzodioxaphospholes (1) with cumyl and t-butylhydroperoxide has been studied kinetically by means of 31P-n.m.r. and e.p.r. spectroscopy and high pressure liquid chromatography. 1 reacts with cumyl hydroperoxide to give the corresponding 2-oxides (2) which with more hydroperoxide and/or water form the phosphate esters 7 and 8.These acidic phosphates decompose cumyl hydroperoxide catalytically giving phenol and aceton.All amides (1) react with t-butyl hydroperoxide stoichiometrically to give t-butanol.The ionic mechanism of hydroperoxide decomposition is accompanied in a minor proportion by a homolytical one.