New answers tagged

0

Carrying on from the comments, your reasoning is right. pKa of protonated carbonyls is ~ -7, whereas that of protonated ethers is ~ -3 (reference). This means that ethers are more basic than carbonyls and would more easily donate their lone pair to $\ce{BF3}$. Here's what the product would look like. Some additional info: ethers are used as complexing ...


3

A mechanism has been proposed herein for the Étard oxidation of ethylbenzene that parallels the proposed oxidation of toluene with chromyl chloride (CrO2Cl2) as a [2,3]-sigmatropic rearrangement that is found on Wikipedia.[1] While such a mechanism is a convenient way to rationalize the formation of benzaldehyde, it does not consider the “Étard complex” that ...


4

Ethylbenzene yields acetophenone when it undergoes Étard reaction. The mechanism is as follows:


4

Starting from any cyclic form of glucose, there are two key ways to form the acetal in sequence (i). Taking glucopyranose as a starting point, here is a reaction scheme: Initially, you could argue that you can protonate either the free hydroxy group (left-hand path) or the cyclic oxygen (right-hand path). The two paths give you either of the two aldehydes ...


5

I think there's nothing to discussed about this further as all comments directing to the correct answer: $x = 4, \ y = 6,$ and $ z = 5.$ I think it's better show in the structures: Glucose is naturally occurring in pyranose hemiacetal form. When subjected to react with $\ce{H+/R-OH}$, the remaining acetal hydroxy group (anomeric hydroxyl group) will ...


1

It is certainly possible to nitrate polystyrene powder with nitric & sulfuric acid mixture and reduce the nitro groups to aniline with $\ce{SnCl2/HCl}$ as described in here1. How effective this would be for a microtitre plate I cannot say, but chemistry is an experimental subject. Reference Zhao, H. & Guo, J. & Bian, L. & Wei, Z. & Deng, ...


Top 50 recent answers are included