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Triflic anhydride is prepared by dehydration of triflic acid using P 4 O 10. [2]Triflic anhydride is useful for converting ketones into enol triflates. [4]In a representative application, is used to convert an imine into a NTf group. [5]
Triethylenetetramine (TETA and trien), also known as trientine when used medically, is an organic compound with the formula [CH 2 NHCH 2 CH 2 NH 2] 2.The pure free base is a colorless oily liquid, but, like many amines, older samples assume a yellowish color due to impurities resulting from air oxidation.
The AIBN-derived 2-cyano-2-propyl radical abstracts the hydrogen from tributyltin hydride. [5] The resulting tributyltin radical can be used for removal of a bromine atom. AIBN-derived radicals abstract a hydrogen from HBr to give a bromine radical, which can add to alkenes .
TFA is also less oxidizing than sulfuric acid but more readily available in anhydrous form than many other acids. One complication to its use is that TFA forms an azeotrope with water (b. p. 105 °C). TFA is used as a strong acid to remove protecting groups such as Boc used in organic chemistry and peptide synthesis. [8] [9]
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Different CAS Registry Numbers [1] are used for each form of a substance. For example, something simple like alanine will have one CAS# for the D form, another for L, another for "unspecified" and a fourth one for racemic. There would be another four CAS#s for the hydrochloride, four for the (1:1) sulfate, four for the (2:1)sulfate, etc.
A two-step synthesis starts from hydrazine, first by alkylation with ethyl chloroformate, followed by treating the resulting diethyl hydrazodicarboxylate with chlorine (bubbling through the solution), hypochlorous acid, concentrated nitric acid or red fuming nitric acid. The reaction is carried out in an ice bath, and the reagents are added ...