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Zn reacted with the allylic bromide to create an allyl zinc species. This is known as the zinc-mediated Barbier- Grignard reaction wikipedia. The allyl zinc species then reacts nucleophilically with the benzaldehyde example here. Reaction can take place through either end of the allylic system with regioselectivity influenced by the choice of reaction ...


6

I am inclined to agree with Waylander and Nilay's comments, but having solved such questions (purely in theory) before, I can attempt to provide an answer. Since the formation of a carbene is an elimination of $\ce{HX}$ ($\ce{X}$ is a halogen), the elimination proceeds fastest for the best leaving group. The best leaving group order in general is $\ce{I > ...


5

TL;DR: The double dot notation is reserved for lone pairs. Diradicals are depicted either with the appropriately placed superscripted dots within a structural formula (e.g. $\ce{^.O-O^.}),$ or superscripted multiplier–dot pair (e.g. $\ce{O2^{2.}}).$ The recommended notation for monooxygen 1,1-diradical is $\ce{O^{2.}}.$ First, let's sort out terminology. ...


5

TL;DR: The mechanism is different for fluorine and chlorine atoms. Fluorine atoms react and forms stable HF molecules while chlorine atoms turns into a radical by the action of UV which helps in the destruction of ozone. Long answer: Ozone depleting substance(ODS) are gases that take part in ozone depletion process. Most of the ODS are primarily ...


5

This is not a radical process. BrCl is a source of Br+, so this is the addition of Br+ to the alkene followed by capture of the cation (bromonium ion) by Cl- JACS paper on BrCl addition to alkenes The product is that of Cl- addition to the most stable cation centre i.e the tertiary centre, so 1-methyl-1-chloro-2-bromocyclohexane is the product.


4

TL;DR: The primary transition responsible for color is apparently the ${\pi{-}\pi}^*$ transition of the conjugated ketyl radical anion. This absorbs usually around the green to orange portions of the visible spectrum, leaving behind the purple-blue, and sometimes green color. Original answer (background info): According to Wikipedia/Benzophenone, the ketyl ...


3

Aminoxyl (trivial name: a nitroxyl radical or a nitroxide) denotes a radical functional group with general structure $\ce{R2N–O^•}$. It is well known that sterically unhindered aminoxyls baring $\alpha$‐hydrogens are unstable and undergo rapid disproportionation to nitrones and hydroxylamines (Ref.1: A new mechanism for the decomposition of $\alpha$‐hydrogen ...


3

You are making a chemical laser. A laser depend on keeping a positive difference in population between the two levels involved (upper >lower), and of course feedback for a laser oscillator. It does not matter how many I* you make as long as the lasing transition does not go the the lowest ground state level. You must make the transition end at a higher ...


3

A priori, I would expect substituted methyl radicals to adopt a planar structure due to Bent’s rule. However, I consider it possible for methyl radicals with electron-withdrawing substituents to adopt a trigonal-pyramidal structure too. In this case, Bent’s rule would imply that the electron-withdrawing substituents are ‘more electron-withdrawing’ than the ...


3

This reaction is an example Barbier reaction (Ref.1), which was discovered by Philippe Barbier who was the teacher of Victor Grignard, the discoverer of Grignard reaction. The main difference other than metal used between Barbier and Grignard reactions are the former is one-pot reaction while the latter is two pot reaction as ref.1 states: A synthesis with ...


2

It is impossible to compare the stability of methane and carbon tetrachloride directly as the do not have a common frame of reference. At the same time you cannot claim that the dichlorine molecule is less stable than the hydrogen chloride molecule. The only true observation that you can make is that the reaction of methane and chlorine to chloromethane and ...


2

On OP's comment: I just don't see how the carbon can become part of the chain! shows confusion on the mechanism. However, the comments by user55119 and Ron correctly suggested the path of the mechanism. I thought it would be helpful to put the matter as a solution. Following scheme shows the possible mechanism to achieve the sought product: Note that, ...


1

HCQ does show antiviral properties in vitro, but, in vivo (in humans), when taken after an initial dose of 800mg for 4 days at 600 mg/day, it was not found to prevent COVID-19 in high-risk exposure settings. Thus, it didn't stop people from getting SARS-CoV-2 infection followed by onset of symptoms/severity. I suspect this is exactly what would happen with ...


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