Cycloaddition of nitrile imines 4 generated in situ by the catalytic dehydrogenation of diphenyl hydrazones 3 using Chloramine-T (CAT) as oxidant in glacial acetic acid with enolic form of ethyl acetoacetate 5 afforded Ethyl 3-aryl-5-methyl-1-phenyl-1H-pyrazol-4-carboxylate 6 in 80% yield. The said pyrazoles 6 refluxed with 80% hydrazine hydrate using absolute alcohol as solvent for about 2-3 h...

2-(Diphenyl-thio-phosphino)dimethyl-amino-methyl-ferrocene is a key inter-mediate in the synthesis of various ferrocenyl ligands. During one such synthesis, the title compound, [Fe(C(5)H(5))(C(20)H(22)NPS)](C(12)H(10)PS(2)), was isolated as a by-product. It is built up by association of (2-(diphenyl-phosphino)ferrocen-yl)meth-yl)dimethyl-ammonium cations and diphenyl-phosphino dithio-ate anions...

Brominated diphenyl ethers (BDE47, 99, 100, and 209) were measured in air, snow and sea ice throughout western Antarctica between 2001 and 2007. BDEs in Antarctic air were predominantly associated with aerosols and were low compared to those in remote regions of the northern hemisphere, except in Marguerite Bay following the fire at Rothera research station in Sept 2001, indicating that this ev...