phosphorus oxychloride
1.A series of 2 pyrazolyl 5 substituted 1,3,4 oxadiazoles were synthesized starting from 5 pyrazole formic acid hydrazide and carboxylic acid by one pot method in the presence of phosphorus oxychloride.
2.7-Acetamide-4-hydroxy-2-naphthalenesulfonyl chloride was synthesized with yield of 92% by treatment of 7-acetamide-4-hydroxy-2-naphthalene sodium sulphate with phosphorus oxychloride in the presence of N,N-dimethylacetamide(DMA) in acetonitrile. It.
3.Therefore 2-benzo(b)furancarboxylic acid react with equivalent of arylhydrazines and aryloxyacetyl hydrazines, respectively, in the presence of phosphorus oxychloride under microwave irradiation to afford 18 compounds of 2,5-disubstituted 1,3,4-oxadiazoles in good to high yield.
4.After cross-linked with phosphorus oxychloride the polarization cross of tapioca starch under polarized light has no distinct change in the different period of the biodegradation, showing that when the degree of cross linking is high starch biodegradation is very difficult.
5.This paper deals with the synthesis of two halogen-free flame retardants named pentaerythritol bisphosphorate melamine salt(B-1) and l-oxy-4-hydroxymethyl-l-phopha-2,6,7-trioxabicyclo[2,2,2]octane (PEPA) through the reaction of industrial pentaerythritol, phosphorus oxychloride, and melamine as raw materials. The structure of the two flame-retardants were characterized by IR, element analysis, and melting point deternination.
6.Two types of P Br N contained flame retardant,O (2,4,6 1 trioxo 1 oxyphosphabiscyclooctane 4 methylene) O (2,3 dibromopropyl)phosphoric melamine salt and O (2,4,6 tribromophenyl)phosphoric melamine salt,were synthesized from phosphorus oxychloride,pentaerythritol,2,3 dibromopropanol,2,4,6 tribromophenol and melamine,etc.
