11. PBDEs _ polybrominated diphenyl ethers _ are commonly used in upholstery, electronics and other foam and plastic products. 12. This notation has been extended to other widely studied environmental contaminants with similar structural properties-polybrominated diphenyl ethers. 13. Diphenyl -2-pyridylphosphine is an integral ligand in the Pd ( II ) catalyzed carbonylation of alkynes.14. "' Diphenyl -2-pyridylmethane "'is a stimulant that is related to desoxypipradrol. 15. Thioxanthone can be prepared by the reaction of diphenyl sulfide with phosgene in the presence of catalytic aluminium chloride. 16. Disulfides where the two R groups are the same are called symmetric, examples being diphenyl disulfide and dimethyl disulfide. 17. Substantial levels of persistent, bioaccumulative and toxic ( PBT ) polybrominated diphenyl ethers were detected in biosolids in 2001. 18. It can also generate the ( diphenyl ) methyl carbene and nitrogen gas upon illumination by ultraviolet light or heating. 19. This method was used to synthesize 1, 8-diphenyl -1, 3, 5, 7-octatraene. 20. Using the Ramberg B�cklund reaction to synthesize 1, 8-diphenyl -1, 3, 5, 7-octatraene
