Diphenyl Black In 1902, the Farbwerke Hoechst, a large German producer of coal tar intermediates and dyes, invented an Aniline Black process to which they gave the name Diphenyl Black.
The chief departure from the previous Aniline Black methods was the replacing of part of the aniline oil of the dye mixture by Diphenyl Black Base I, which is para-aminodiphenylamine.
This base has the property of being oxidized to Aniline Black, just like aniline oil, and the advantage claimed for the Diphenyl Black is that it produces an absolutely ungreenable black.
On account of the comparatively high cost of the Diphenyl Black Base I, this method has not found very extensive application, especially as highly satisfactory ungreenable blacks can now be produced by other methods.
If, however, one of the para positions in the hydrazo compound is substituted, then either diphenyl derivatives or azo compounds are formed, or what is known as the semidine change takes place (P.
With a methyl group, the chief product is an ortho-semidine, whilst with a carboxyl group, the diphenyl derivative is the chief product.
It is reduced by sodium amalgam to benzhydrol or diphenyl carbinol C6H5.
The conversion of the latter intodiphenyl arsinic acid.
At Ludwigshafen the conversion to diphenyl arsinic acid occurred.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "diphenyl" in a variety of sentences. We hope that you will now be able to make sentences using this word.
