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4-Methylcatechol (4-methylbenzene-1,2-diol) Orcinol (5-methylbenzene-1,3-diol) Methoxyphenols — can be derived from benzenediols by O-methylation. Guaiacol (2-methoxyphenol, O-Methylcatechol) Mequinol (4-Methoxyphenol) Dimethoxybenzenes — can be derived from benzenediols by two rounds of O-methylation. Veratrole (1,2-Dimethoxybenzene) 1,3 ...
Examples include ethane-1,2-diol or ethylene glycol HO−(CH 2) 2 −OH, a common ingredient of antifreeze products. Another example is propane-1,2-diol , or alpha propylene glycol, HO−CH 2 −CH(OH)−CH 3 , used in the food and medicine industry, as well as a relatively non-poisonous antifreeze product.
The reaction mechanism of the Sharpless dihydroxylation begins with the formation of the osmium tetroxide – ligand complex (2). A [3+2]-cycloaddition with the alkene (3) gives the cyclic intermediate 4. [9] [10] Basic hydrolysis liberates the diol (5) and the reduced osmate (6).
When cyclopentadiene is used as the diene, the vicinal norbornene diol bicyclo[2.2.1]hept-5-ene-2,3-diol is formed after hydrolysis. The Swern oxidation to the 1,2-ketone bicyclo[2.2.1]hept-5-ene-2,3-dione proceeds (in the variant with trifluoroacetic anhydride instead of oxalyl chloride) with a yield of 73%. [14]
Hagemann's ester, ethyl 2-methyl-4-oxo-2-cyclohexenecarboxylate, is an organic compound that was first prepared and described in 1893 by German chemist Carl Hagemann. The compound is used in organic chemistry as a reagent in the synthesis of many natural products including sterols , trisporic acids , and terpenoids .
Orcinol (5-methylbenzene-1,3-diol or 3,5-dihydroxytoluene) 2-methylbenzene-1,4-diol; See also. Cresol (methylphenol, hydroxytoluene) Trihydroxytoluene
The suffixes -diol, -triol, -tetrol, etc., are used for multiple −OH groups: Ethylene glycol CH 2 OHCH 2 OH is ethane-1,2-diol. If higher precedence functional groups are present (see order of precedence , below), the prefix "hydroxy" is used with the bonding position: CH 3 CHOHCOOH is 2-hydroxypropanoic acid.
While several different routes to the 1,3,2,4-dithiadiphosphetane 2,4-disulfides exist the most commonly used is the electrophilic aromatic substitution reaction of an arene with P 4 S 10. An alternative reaction is the reaction of a thiol with P 4 S 10 to form a substance like the Davy reagent. The Davy reagent is identical to Lawesson's ...