منابع مشابه
Isolating fluorinated carbocations.
Using carboranes as counterions, fluorinated benzyl-type carbocations such as (p-FC(6)H(4))(2)CF(+), (p-FC(6)H(4))(CH(3))CF(+) and fluorinated trityl ions are readily isolated for X-ray and IR structural characterization.
متن کاملCarbocations on Zeolites . Quo Vadis ?
A natureza dos carbocátions adsorvidos na superfície da zeólita é discutida neste artigo, destacando estudos experimentais e teóricos. A adsorção de halogenetos de alquila sobre zeólitas trocadas com metais tem sido usada para estudar o equilíbrio entre alcóxidos, que são espécies covalentes, e carbocátions, que têm natureza iônica. Cálculos teóricos indicam que os carbocátions são mínimos (int...
متن کاملExtending conjugation in porphyrin dimer carbocations.
The addition of alkynyl porphyrins to carbonyl compounds was used to prepare a series of porphyrin dimer tertiary alcohols. Treatment of these alcohols with acid gave conjugated carbocations with three to nine carbon atoms bridging between the porphyrins. All these carbocations show strong absorption in the near-IR region between 1000-1800 nm. The absorption spectra exhibit a length-dependence ...
متن کاملFast Reaction Studies of Carbocations in Solution
The pulse radiolysis method has been used to generate and study a series of fivecarbocations, consisting of phenylcarbenium ions and cyclopropylphenylcarbenium ions, in chlorocarbon solvents. Rate constants for the reactions of these substituted carbenium ions with various nucleophiles such as halide ions, alkyl amines, amonia and water, have been determined. The observed reactivity trends (or,...
متن کاملIsolating SRP
Isolating SRP ike a crate of beer ready to be shipped overseas, secretory proteins carry a label that says, “For Export.” With clever experiments, Günter Blobel of Rockefeller University and his post-doc Bernhard Dobberstein (Blobel and Dobberstein, 1975a,b) showed that the cell’s export label is the signal sequence, a short stretch of amino acids that guides the forming protein to the ER (see ...
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ژورنال
عنوان ژورنال: Chemical Communications
سال: 2007
ISSN: 1359-7345,1364-548X
DOI: 10.1039/b617606b