31. One involved cooking-oil contaminated with two substances closely related to dioxin : polychlorinated biphenyls and furans . 32. Dioxins and furans , byproducts in almost all industry, have proved to be the hardest to regulate. 33. In furan a lone pair of the oxygen atom interacts with the ? orbitals of the carbon atoms. 34. Furan is a colorless, flammable, highly volatile liquid with a boiling point close to room temperature.35. "' Benzofuran "'is the heterocyclic compound consisting of fused benzene and furan rings. 36. Some Ru-NHC complex catalyze asymmetric hydrogenations of benzofurans and furans . with high levels of enantioinduction. 37. The molecule is a derivative of furan , containing both aldehyde and ether ( methoxymethyl ) functional groups. 38. The first furan derivative to be described was 2-furoic acid, by Carl Wilhelm Scheele in 1780. 39. 2-Furanones can be converted to furans by a two-step process of reduction followed by dehydration. 40. The company was the first to produce 13C labeled chlorinated dioxins and furans in cooperation with Cambridge Isotope Laboratories.
