Search results
Results from the WOW.Com Content Network
Biphenyl (also known as diphenyl, phenylbenzene, 1,1′-biphenyl, lemonene [4] or BP) is an organic compound that forms colorless crystals. Particularly in older literature, compounds containing the functional group consisting of biphenyl less one hydrogen (the site at which it is attached) may use the prefixes xenyl or diphenylyl .
2,2',3,3',4,4'-Hexachlorobiphenyl is an organic chemical and belongs to a group of compounds called polychlorinated biphenyls. This group of organic compounds was used in transformers as dielectric fluids, until production was banned in 1979.
One estimate (2006) suggested that 1 million tonnes of PCBs had been produced. 40% of this material was thought to remain in use. [2] Another estimate put the total global production of PCBs on the order of 1.5 million tonnes. The United States was the single largest producer with over 600,000 tonnes produced between 1930 and 1977.
5CB is produced by modifying biphenyl in a linear manner. First Br 2 is added to the biphenyl to introduce a bromine atom to the end of the moiety. Next aluminium chloride and C 4 H 9 COCl is added to the sample, followed by the addition of potassium hydroxide and NH 2 NH 2.
The venture produced vanillin, ... Until it ended production in 1977, Monsanto was the source of 99% of the polychlorinated biphenyls (PCBs) used by U.S. industry. [38]
Bisphenol A (BPA) is a chemical compound primarily used in the manufacturing of various plastics.It is a colourless solid which is soluble in most common organic solvents, but has very poor solubility in water.
The industrial synthesis of 4,4′-biphenol was developed by Allan Hay in the 1960s. [2] [3] As the direct oxidative coupling of phenol gives a mixture of isomers, [4] [5] 4,4′-biphenol is instead prepared from 2,6-di-tert-butylphenol, where para-coupling is the only possibility. [3]
Monsanto produced PCBs from 1935 to 1977. Plaintiffs have said Monsanto knew of the dangers of PCBs for decades, but concealed them from the public and from government regulators.