Part 3: Oxidation: See Video Link https://youtu.be/rVU-zRC7zDc In this part, you will test the following compounds: ethanol, 2-propanol, 2- methyl-2-propanol, phenol solution, and your unknown. Place 10 drops of ethanol, 2-propanol, 2-methyl-2- propanol, cyclohexanol, 1-octanol, a 20% phenol solution, and your unknown into separate test tubes. Carefully add 5 drops of chromate solution to each. Stir carefully with stir rod, making sure to clear stir rods between each test tube. Caution: chromate solution contains concentrated sulfuric acid, which is corrosive. If any skin contact occurs, go immediately to sink and rinse for 15 minutes and notify instructor. Look for a color change in the chromate solution, orange color change to blue/green/black indicates oxidation has occurred. If orange color persists, oxidation did not occur and write "no reaction". Record your observations. Waste disposed of in chemical waste containers in waste hood. If a reaction occurred, draw the condensed or line-bond structure of the oxidation product. Structure of oxidation product If no reaction, put no product! alcohol Color after 2 min- Classification be detailed! of alcohol ethanol went from or ange to light Primary blue green Color 2-propanol went from Or cnge to light blue color secon dary and has a 1++に dark blune stuff on botton 2-methyl-2- propanol Stayed the orange Color product ter ti ary from beginning cyclohexanol went or ange to blue a green color Secondary phenol went orange to dar k brown black Color
Reactive Intermediates
In chemistry, reactive intermediates are termed as short-lived, highly reactive atoms with high energy. They rapidly transform into stable particles during a chemical reaction. In specific cases, by means of matrix isolation and at low-temperature reactive intermediates can be isolated.
Hydride Shift
A hydride shift is a rearrangement of a hydrogen atom in a carbocation that occurs to make the molecule more stable. In organic chemistry, rearrangement of the carbocation is very easily seen. This rearrangement can be because of the movement of a carbocation to attain stability in the compound. Such structural reorganization movement is called a shift within molecules. After the shifting of carbocation over the different carbon then they form structural isomers of the previous existing molecule.
Vinylic Carbocation
A carbocation where the positive charge is on the alkene carbon is known as the vinyl carbocation or vinyl cation. The empirical formula for vinyl cation is C2H3+. In the vinyl carbocation, the positive charge is on the carbon atom with the double bond therefore it is sp hybridized. It is known to be a part of various reactions, for example, electrophilic addition of alkynes and solvolysis as well. It plays the role of a reactive intermediate in these reactions.
Cycloheptatrienyl Cation
It is an aromatic carbocation having a general formula, [C7 H7]+. It is also known as the aromatic tropylium ion. Its name is derived from the molecule tropine, which is a seven membered carbon atom ring. Cycloheptatriene or tropylidene was first synthesized from tropine.
Stability of Vinyl Carbocation
Carbocations are positively charged carbon atoms. It is also known as a carbonium ion.
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