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4-Chloro-α-pyrrolidinovalerophenone (also known as 4-chloro-α-pyrrolidinopentiophenone, 4-chloro-α-PVP, 4Cl-PVP, or 4C-PVP, or alpha-PVP, or flakka) is an emerging recreational designer drug of the pyrrolidinophenone class, similar in structure to α-pyrrolidinopentiophenone (α-PVP). [1]
Related to its tendency to hydrolyze, TMSOTf is effective for silylation of alcohols: [2] (CH 3) 3 SiO 3 SCF 3 + ROH + Et 3 N → ROSi(CH 3) 3 Si + [Et 3 NH]O 3 SCF 3. A common use of (CH 3) 3 SiO 3 SCF 3 is for the preparation of silyl enol ethers. [3] [4] One example involves the synthesis of the silyl enol ether of camphor:
The reagent competes with the carbonyl for the reactive intermediate, rapidly sequestering [CF 3] − in a reversibly-generated -ate complex [(CF 3) 2 Si(CH 3) 3] −. This -ate complex is unable to react directly with the carbonyl, resulting in powerful inhibition of the chain reaction by the reagent.
Tetramethylsilane is the accepted internal standard for calibrating chemical shift for 1 H, 13 C and 29 Si NMR spectroscopy in organic solvents (where TMS is soluble). In water, where it is not soluble, sodium salts of DSS, 2,2-dimethyl-2-silapentane-5-sulfonate, are used instead. Because of its high volatility, TMS can easily be evaporated ...
α-Pyrrolidinopentiophenone (α-PVP), also known as α-pyrrolidinovalerophenone, O-2387, β-keto-prolintane, prolintanone, [2] [3] or desmethylpyrovalerone, is a synthetic stimulant of the cathinone class developed in the 1960s that has been sold as a designer drug and often consumed for recreational reasons.
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The cross-linked form of PVP is used as a disintegrant (see also excipients) in pharmaceutical tablets. [1] PVPP is a highly cross-linked version of PVP, making it insoluble in water, though it still absorbs water and swells very rapidly generating a swelling force. This property makes it useful as a disintegrant in tablets.
A translation memory (TM) is a database that stores "segments", which can be sentences, paragraphs or sentence-like units (headings, titles or elements in a list) that have previously been translated, in order to aid human translators.