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The reaction of an organic substrate with phosgene is called phosgenation. [9] Phosgenation of diols give carbonates (R = H, alkyl, aryl), which can be either linear or cyclic: n HO−CR 2 −X−CR 2 −OH + n COCl 2 → [−O−CR 2 −X−CR 2 −O−C(=O)−] n + 2n HCl. An example is the reaction of phosgene with bisphenol A to form ...
It behaves like phosgene, to which it cracks thermally: OC(OCCl 3) 2 ⇌ 3 OCCl 2. Alcohols are converted to carbonates. Primary and secondary amines are converted to ureas and isocyanates. [6] [7] [9] [10] Triphosgene has been used to synthesize chlorides. [8] Some Alkyl chlorides are prepared by treating alcohols with a mixture of triphosgene ...
A white solid, it is prepared by reaction of anthranilic acid with phosgene. [1] Reactions. Hydrolysis gives carbon dioxide and anthranilic acid. Alcoholysis proceeds ...
The sulfonium oxidations can be categorized into two groups: The methods discovered earliest rely on activated alcohols like alkyl tosylates (Kornblum oxidation) [2] or alkyl chloroformates (from reaction of alcohols with phosgene: Barton-Kornblum) [3] that react as electrophiles when treated with DMSO, liberating an oxygenated leaving group (e.g. OTs−).
Organic carbonates are not prepared from inorganic carbonate salts. [citation needed] Two main routes to carbonate esters are practiced: the reaction of an alcohol (or phenol) with phosgene (phosgenation), and the reaction of an alcohol with carbon monoxide and an oxidizer (oxidative carbonylation).
Triphenylphosphine oxide can be difficult to remove from reaction mixtures by means of chromatography. It is poorly soluble in hexane and cold diethyl ether . Trituration or chromatography of crude products with these solvents often leads to a good separation of triphenylphosphine oxide.
Traces of a toxic, colorless gas were found at the headquarters of Sweden’s security agency where a suspected gas leak last week forced authorities to evacuate some 500 people from the facility ...
The net reaction is as follows: 2 PhOH + COCl 2 → PhOCO 2 Ph + 2 HCl. The use of phosgene can be avoided by the oxidative carbonylation of phenol with carbon monoxide: [2] 2 PhOH + CO + [O] → PhOCO 2 Ph + H 2 O. Dimethyl carbonate can also be transesterified with phenol: CH 3 OCO 2 CH 3 + 2 PhOH → PhOCO 2 Ph + 2 MeOH