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The chemical synthesis of BHT in industry has involved the reaction of p-cresol (4-methylphenol) with isobutylene (2-methylpropene), catalyzed by sulfuric acid: [11] CH 3 (C 6 H 4)OH + 2 CH 2 =C(CH 3) 2 → ((CH 3) 3 C) 2 CH 3 C 6 H 2 OH. Alternatively, BHT has been prepared from 2,6-di-tert-butylphenol by hydroxymethylation or aminomethylation ...
Isobutylene (or 2-methylpropene) is a hydrocarbon with the chemical formula (CH 3) 2 C=CH 2. It is a four-carbon branched alkene (olefin), one of the four isomers of butylene . It is a colorless flammable gas, and is of considerable industrial value.
As a serum or moisturizer, hyaluronic acid works by drawing water into the skin and keeping it there. “This miracle skincare ingredient is hydrophilic in nature, which means it attracts and ...
Pseudofolliculitis barbae (PFB) is a type of irritant folliculitis that commonly affects people who have curly or coarse facial hair. [1] It occurs when hair curls back into the skin after shaving, causing inflammation, redness, and bumps. [2] [3] This can lead to ingrown hairs, scarring, and skin discoloration. PFB can be treated with various ...
To provide extra benefits for hair, skin and nails, this supplement contains a proprietary blend of ingredients, including MSM to lower inflammation in the body and strengthen keratin, l ...
The personal skin care market based on natural products has shown strong growth. [7] Clinical and laboratory studies have identified activities in many natural ingredients that have potential beneficial activities for personal skin care, [2] [3] but there is a shortage of convincing evidence for natural product efficacy in medical problems. [8]
UNSPOTTED 4X® Acid Jelly Night Serum. The "4X" in this serum's name is thanks to the 15 percent blend of lactic, azelaic, glycolic, and tranexamic acids, which together help reduce the appearance ...
Between the Renaissance and the Enlightenment, a number of dangerous hair bleaching methods remained widely practiced, including the use of sulfuric acid, which was an accepted form of hair coloring around the 1600s, and laying out in the sun with hair covered in lye a century later. [4]