Showing papers on "Dichlorophenylphosphine published in 2001"
TL;DR: In this article, two polyphosphonates having multiple flame-retardant actions were synthesized by interfacial polycondensation of a bisphenol and dichlorophenylphosphine oxide using cetyl trimethyl ammonium chloride as a phase transfer catalyst (PTC).
Abstract: Two polyphosphonates having multiple flame-retardant actions were synthesized by interfacial polycondensation of a bisphenol and dichlorophenylphosphine oxide using cetyl trimethyl ammonium chloride as a phase transfer catalyst (PTC) at 0°C. The polyphosphanates thus prepared were characterized by viscometry, elemental analysis, IR, 1H-NMR, 31P-NMR, and X-ray diffraction studies. These polymers are highly soluble in polar solvents such as DMF, DMAc, DMSO, etc., as well as in chlorinated hydrocarbon solvents such as CH2Cl2, CHCl3, etc. The thermal study of polymers was carried out by TGA and DTA analyses. The flammability of the polymers was studied by the limiting oxygen index measurements. The polymers are self-extinguishing, and begin to lose weight at around 252°C. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 785–792, 2001
14 citations
TL;DR: In this article, the asymmetric boat-chair conformation of 4,8-dimethyl-2-phenyl-1,3,6,2-dioxaselenaphosphocane 2-oxide was established in both solid state and solution for the eight-membered heterocycles.
Abstract: 4,8-Dimethyl-2-phenyl-1,3,6,2-dioxaselenaphosphocane 2-selenide 6 was synthesized by the condensation of dichlorophenylphosphine and 4-selenaheptane-2,6-diol 8 followed by oxidation with selenium. The conformations of 6 and related 2-(p-methylphenoxy)-1,3,6,2-dioxaselenaphosphocane 2-oxide 7 in the solid state and in solution were studied through X-ray diffraction and NMR spectroscopy. The asymmetric boat–chair conformation in both solid state and solution was established for the eight-membered heterocycles.