منابع مشابه
Organocatalytic Mitsunobu reactions.
A catalytic Mitsunobu reaction system is described in which the azo reagent is used as an organocatalyst and iodosobenzene diacetate is used as the stoichiometric oxidant. In this system, iodosobenzene diacetate oxidizes the formed hydrazine byproduct to regenerate the azo reagent. Yields obtained in the catalytic reactions using a variety of carboxylic acids and alcohols were slightly lower th...
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Reaction of hexa-N-Boc neomycin B with TPP and DIAD in toluene results in the formation of an epoxide in ring IV, not an aziridine or azetidine as previously reported.
متن کاملRecyclable Mitsunobu reagents: catalytic Mitsunobu reactions with an iron catalyst and atmospheric oxygen.
Aerobic recycling: A catalytic amount of a hydrazine reagent is sufficient to promote Mitsunobu reactions in the presence of triphenylphosphine, an iron catalyst, and air. The active form of the catalyst, an azo species, can be readily generated by iron-catalyzed aerobic oxidation. MS = molecular sieves, Pc = phthalocyanine.
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where d is a positive integer, 0≤ i< d and r0,r1, . . .rd−1 are rational numbers, such that the famous 3x+1 conjecture holds if and only if the R-orbit of 2n contains 2 for all positive integers n. We then show that the R-orbit of an arbitrary positive integer is a constant multiple of an orbit that contains a power of 2. Finally we apply our main result to show that any cycle {x0, . . . ,xm−1}...
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ژورنال
عنوان ژورنال: Nature Chemistry
سال: 2013
ISSN: 1755-4330,1755-4349
DOI: 10.1038/nchem.1639