Production
A number of possible routes can be used to prepare crystal violet. The original procedure developed by Kern and Caro involved the reaction of dimethylaniline with phosgene to give 4,4'-bis(dimethylamino)benzophenone (Michler's ketone) as an intermediate. This was then reacted with additional dimethylaniline in the presence of phosphorus oxychloride and hydrochloric acid.
The dye can also be prepared by the condensation of formaldehyde and dimethylaniline to give a leuco dye:
- CH2O + 3 C6H5N(CH3)2 → CH(C6H4N(CH3)2)3 + H2O
Second, this colourless compound is oxidized to the coloured cationic form: (A typical oxidizing agent is manganese dioxide).
- CH(C6H4N(CH3)2)3 + HCl + 1/2 O2 → Cl + H2O
Read more about this topic: Crystal Violet
Famous quotes containing the word production:
“The production of too many useful things results in too many useless people.”
—Karl Marx (18181883)
“Constant revolutionizing of production ... distinguish the bourgeois epoch from all earlier ones. All fixed, fast-frozen relations, with their train of ancient and venerable prejudices are swept away, all new-formed ones become antiquated before they can ossify. All that is solid melts into air, all that is holy is profaned, and man is at last compelled to face with sober senses, his real conditions of life, and his relations with his kind.”
—Karl Marx (18181883)
“Perestroika basically is creating material incentives for the individual. Some of the comrades deny that, but I cant see it any other way. In that sense human nature kinda goes backwards. Its a step backwards. You have to realize the people werent quite ready for a socialist production system.”
—Gus Hall (b. 1910)