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Grignard Formation of Crystal Violet23.

Crystal Violet is used as an acid-base indicator, an alcohol denaturant, a biological stain, a textile dye and an indicator for copper salts. It is a component of gram staining in microorganisms and cell lines.

Synthesize crystal violet from this Grignard ..

Purpose/Overview: Thepurpose of this lab was to create a dye, either Malachite Green orCrystal Violet using a grignard reagent – 4-bromo-N,N-dimethylanilineand using the ester – methyl benzoate. This experiment wasverytricky due to the fact that an anhydrous environment wascritical. After synthesizing the dye, a piece of cloth wasdyedfor visualization.

Grignard Formation of Crystal Violet

and having three of them yields a violet dye (Crystal ..

Purpose/Overview:The objective of the lab is to prepare a dye, either Malachite Green orCrystal Violet, using a reaction involving a Grignard reagent and anester. I will be making Malachite Green. TheGrignardreagent that is initially prepared is n-butyl magnesium bromide byreacting n-butyl bromide with magnesium in dry lab equipment, so thatthe resulting Grignard reagent does not react with water to form ahydrocarbon. The magnesium bromide is then transferred to4-bromo-N,N-dimethylaniline via transmetallation, which is done as ashort cut to what would otherwise be a lengthy reaction of an arylbromide and magnesium metal. The yield of the reaction willbedetermined by measuring the dye’s absorbance via a UV/visiblespectrophotometer and utilizing Beer’s law to calculate theconcentration of the dye. The dye will also be used to dye apiece of cloth.

The Grignard reagent was prepared from 4-bromo-N,N-dimethylaniline and combined with diethyl carbonate, then followed by acid hydrolysis, which led to the crystal violet.

Grignard Formation of Crystal Violet 23

Kinetics of crystal violet fading - inquiry

Crystal Violet lactone is an important functional dye for the production of pressure sensitive materials. It is a chemical intermediate , intermediates for thermal/carbonless Paper, used in medicine and biochemical research, a leuco dye..

Purpose/Overview: Thepurpose of this lab is to synthesize crystal violet using a Grignardreaction and to find the yield of our reaction. Here we needtoset up a reflux apparatus making sure that the reactants have noexposure to water. Once the reaction is complete we will takeourdye, dilute samples of it, and find their absorbance using a UV/visiblespectrometer. The absorbance will be used to find theconcentration of the dye by Beer’s Law. The concentration anddye quantity will then be used to find our yield and percentyield. A piece of cloth will also be dyed with the productdye.

1/19/2017 · I need to write out the full mechanism for the reaction of malachite green and crystal violet dyes
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