The Curtius and Wolff rearrangements of peroxide-containing alkanoyl azides and diazoketones provide an effi cient entry to peroxysubstituted amines, isocyanates, carbamates, and peroxyalkanoates. Scheme 2. Substrate preparation. Reagents and conditions: (a) tBuO2H, CsOH; (b) KMnO4; (c) m-CPBA; (d) t-BuO2H, BF3OEt2; (e) H2CrO4. 7456 DUSSAULT & XU IN TETRAHEDRON LETTERS 45 (2004) 2. Curtius rear...

Greenhouse gas CO2 emissions to the atmosphere are believed to be the primary reason for the global warming. One effective way to mitigate CO2 emissions is to capture CO2 from post-combustion flue gas in coal-fired power plants. Membrane technology has been widely explored for this application due to its high energy-efficiency. Current membrane materials are often based on poly(ethylene oxide) ...

Carbohydrate moieties are important components of natural products, which are often imperative for the solubility and biological activity of the compounds. The aromatic polyketide alnumycin A contains an extraordinary sugar-like 4'-hydroxy-5'-hydroxymethyl-2',7'-dioxane moiety attached via a carbon-carbon bond to the aglycone. Here we have extensively investigated the biosynthesis of the dioxan...

The extremely mild and highly efficient catalytic generation of non-metalated, conjugated acetylides is reported. These acetylides are used to generate enol-protected functionalized propargylic alcohols 1, 1,3-dioxolane compounds 2, or 3,4,5-trisubstituted 4,5-dihydrofurans 4 through serial multibond-forming processes. The method calls for a nucleophile (a tertiary amine or phosphine) as a chem...

In the title compound, C(23)H(28)N(2)O(5), the 4,5-dihydro-isoxazole ring adopts a slight envelope conformation and the dioxolane ring is in a twisted conformation. The mol-ecular structure, in the vicinity of the benzyl group, may be influenced by an intra-molecular C-H⋯O hydrogen bond which generates an S(7) ring motif. In the crystal structure, mol-ecules are linked via weak inter-molecular ...

THE TITLE COMPOUND [SYSTEMATIC NAME: (R)-2-trichloro-methyl-3a,3b,7a,8a-tetra-hydro-5H-pyrano[2',3':4,5]furano[2,3-d][1,3]dioxol-5-one], C(9)H(7)Cl(3)O(5), a triyclic system that contains a central α-d-furan-ose ring cis-fused with a dioxolane ring as well as a δ-lactone ring, exhibits a twisted conformation. The CCl(3) group has an axial orientation. The furan-ose ring approximates an envelope...

In the title compound, C10H17IO5, the six-membered tetra-hydro-pyran ring and the five-membered 1,3-dioxolane ring adopt sofa and envelope conformations, respectively. In the crystal, O-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules into layers nearly parallel to the bc plane.