5

Chlorination and bromination of alkenes are very general reactions, and mechanistic study of these reactions provides additional insight into electrophilic addition reactions of alkenes. Although much less detail is known about fluorination and iodination of alkenes, it is believed that iodination follows the similar mechanistic steps of much studied ...


4

When one equivalent of dimethyl sulfate reacts with 3,4-dihydroxybenzaldehyde (protocatechualdehyde), there are two nucleophilic sites in the molecule, namely 3- and 4-hydroxy-groups. If one equivalent of strong base such as $\ce{NaOH}$ is used, it will deprotonate the most acetic group between them, in this case, 4-hydroxy-group. For example, $\mathrm{p}K_\...


3

Fractional order happens in reactions like $$\ce{H_2 + Br_2 <=> 2 HBr}$$ for which Bodenstein and Lind found in 1906 their results in agreement with the empirical equation :$$\frac{d[HBr]}{dt} = \frac{k[H_2][Br_2]^{1/2}}{1 + k'[HBr]/[Br_2]}$$ Thirteen years later, this kinetics law was explained by Christiansen, Herzfeld and Polanyi in terms of the ...


2

I think this is easy to answer than you think. Let's look at the stereochemistry of compounds in the question, 1g and 1h (I also put the common product, 1a, for convenience): The stereospecific reduction is on carbon-3 ($\ce{C}$3) in all cases. Accordingly (see diagram above), if you apply Cahn–Ingold–Prelog (CIP) sequence rules for each, you'd find (3R)- ...


1

Galvanizing by definition is zinc coating. The zinc boils off ( as 1700 F) is approached and immediately oxidizes to ZnO , a white powder. ZnO has the unusual characteristic of causing zinc chills = brass founders ague = oxide shakes, IF inhaled while less than one hour old . After that is is pretty harmless and used in various lotions and creams and ...


1

Below is one way to write it that shows what the enzyme does and avoids the uncertainty of the details: $$\ce{E + H2O2 -> E-O + H2O}\tag{1}$$ $$\ce{E-O + H2O2 -> E-O2 + H2O}\tag{2}$$ $$\ce{E-O2 -> E + O2}\tag{3}$$ In words, the enzyme binds to the first molecule of hydrogen peroxide, release one molecule of water and holds on to the other oxygen ...


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