He was vindicated when Graebe and Liebermann ( 1868 ) distilled alizarin with zinc dust to give anthracene, a C 14 hydrocarbon, and subsequently ( 1869 ) synthesised alizarin from anthraquinone.
12.
The gold precipitate ( mixed with zinc dust ) is then filtered out of the solution, and the zinc dust and gold are mixed with sulfuric acid to dissolve the zinc.
13.
The couple may also be generated in situ by reaction of one equivalent of zinc dust with one equivalent of copper ( I ) chloride ( or copper powder ) in refluxing ether.
14.
During the mid-1950s, " amateur " rocketeers flew a number of zinc dust / sulfur " " micrograin " " solid propellant mail-carrying rockets interstate, from California, across the Colorado River, and into Arizona.
15.
This is sometimes addressed by coating aluminium conductors with an antioxidant paste ( containing zinc dust in a low-residue polybutene base ) at joints, or by applying a mechanical termination designed to break through the oxide layer during installation.
16.
In 1907 the process was still further improved by reducing 2-( 2'- hydroxypropyl ) pyridine with phosphorus and hydroiodic acid at 125 �C and treating the product with zinc dust and water, then reducing the product with sodium in ethanol.
17.
He obtained further evidence for the formation of tetraphenylmethane by reducing the nitro groups to amino groups with zinc dust in acetic acid to the leuco dye "'7 "'which on exposure to hydrochloric acid eliminates aniline to the known compound pararosanilin "'8 " '.
18.
Later Friday, the ministry said tests showed that up to 2, 100 nanograms of dioxin per kilogram ( 2.2 lbs ) was in samples of zinc dust taken just outside the company compound, and dust inside the compound tested 7, 400 nanograms, more than double that originally reported.
19.
The reduction catalysts include mixtures of zinc dust and acetic acid, of lithium aluminium hydride with titanium trichloride ( the reducing agent is actually titanium dichloride, formed by the reaction between LiAlH 4 and TiCl 3 ) and of iron ( III ) chloride with butyllithium in tetrahydrofuran.
20.
An early method for the synthesis of zinc copper couple entailed treatment of a mixture of zinc dust and copper ( II ) oxide with hydrogen gas at 500 �C . Treatment of zinc powder with copper ( II ) acetate monohydrate in hot acetic acid is reportedly highly reproducible.
