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A dry sample is collected with a swab or filter paper. A few drops of alcohol, then a few drops of phenolphthalein, and finally a few drops of hydrogen peroxide are dripped onto the sample. If the sample contains hemoglobin, it will turn pink immediately upon addition of the peroxide, because of the generation of phenolphthalein. A positive ...
Phenolphthalein does not directly participate in this process; instead, it acts as an external source of electrons. In its reaction with hydrogen peroxide, the heme center of hemoglobin behaves as a peroxidase, reducing the peroxide to water. This activity depletes hemoglobin of electrons that are, in turn, re-supplied by the phenolphthalein.
Dialkyl peroxides, e.g., dicumyl peroxide, are synthesized by addition of hydrogen peroxide to alkenes or by O-alkylation of hydroperoxides. Diacyl peroxides are typically prepared by treating hydrogen peroxide with acid chlorides or acid anhydrides in the presence of base: [1] H 2 O 2 + 2 RCOCl → (RCO 2) 2 + 2 HCl H 2 O 2 + (RCO) 2 O → ...
The peroxide group is marked in blue. R, R 1 and R 2 mark hydrocarbon moieties. The most common peroxide is hydrogen peroxide (H 2 O 2), colloquially known simply as "peroxide". It is marketed as solutions in water at various concentrations. Many organic peroxides are known as well. In addition to hydrogen peroxide, some other major classes of ...
The first stage of Fenton's reaction (oxidation of Fe 3+ with hydrogen peroxide) is used in Haber–Weiss reaction; Fenton's reagent can be used in organic synthesis reactions: e.g. hydroxylation of arenes via a free radical substitution; Conversion of benzene into phenol by using Fenton's reagent; Oxidation of barbituric acid into alloxan.
The Dakin oxidation. The Dakin oxidation (or Dakin reaction) is an organic redox reaction in which an ortho- or para-hydroxylated phenyl aldehyde (2-hydroxybenzaldehyde or 4-hydroxybenzaldehyde) or ketone reacts with hydrogen peroxide (H 2 O 2) in base to form a benzenediol and a carboxylate.
Benzoyl peroxide is an over the counter, FDA-approved active ingredient used primarily for the treatment of acne, according to board-certified dermatologist Dr. Marguerite Germain. This ingredient ...
At pH = 10, phenol and phenolate are in approximately 1:1 proportions. The phenoxide anion (aka phenolate ) is a strong nucleophile with a comparable to the one of carbanions or tertiary amines. [ 3 ]
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