Reaction between triphenylphosphine, dimethy acetylenedicarboxylate and amines produces phosphorus ylids which undergo a smooth reaction with ethyl chlorooxoacetate and triethylamine to produce dimethyl N-aryl-(or alkyl)-4-ethoxy-5-oxo-2,5-dihydro-1 H-pyrole-2,3-dicarboxylates in high yields.

Effects of multi-walled carbon nanotubes (MWNTs) on flame retardation as well as thermal stabilization efficiency of two phosphorus-containing flame retardant systems i.e. ammonium polyphosphate/pentaerythritol (APP/PER) and red phosphorus (RP) in polypropylene (PP) have been investigated. Limiting oxygen index (LOI), thermo-gravimetric analysis (TGA), melt flow index (MFI) and tensile tests have been performed in this study. It was shown that the addition of MWNTs alone at a minimum loading level of 4 wt% improves thermal stability of PP considerably without any undesirable effect on its flow-ability and mechanical properties. Furthermore, addition of MWNTs alone resulted in a slight improvement of flammability of the polymer. However, comparison between thermal stability and flame retardancy of PP samples containing a combination of MWNTs and APP/PER or RP with those of the samples containing APP/PER or RP alone proved that MWNTs interfere with thermal stabilization and flame retardation efficiency of both APP/PER and RP in the polymer.

Reaction Between Triphenylphosphine, Primary Amines, Dimethyl Acetylenedicarboxylate and Ethyl Chlorooxoacetate. -9 Title compounds of type (IV) are prepared from dimethyl acetylenedicarboxylate (II), and compound (I) or (V) in the presence of various trivalent phosphorous compounds. -(ANARY-ABBASINEJAD*, M.; ANARAKI-ARDAKANI, H.; DEHGHAN, A.; HASSANABADI, A.; SEYEDMIR, M. R.; J. Chem. Res. 2007, 10, 574-576; Dep. Chem., Islamic Azad Univ., Yazd, Iran; Eng.) -M. Bohle 15-112