Results 251 to 260 of about 207,671 (274)
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Donor-Substituted Nitrocyclopropanes: Immediate Ring-Enlargement to Cyclic Nitronates
Organic Letters, 2013The reaction of donor-substituted alkenes with α-diazo-α-nitro ethyl acetate under Rh catalysis was investigated; respective nitrocyclopropanes with a geminal ester functionality were generated in situ. Strong electron donors immediately led to ring-enlargement.
Christian D, Schmidt +5 more
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A Convenient Synthesis of 4‐Aminoaryl Substituted Cyclic Imides.
ChemInform, 2003AbstractFor Abstract see ChemInform Abstract in Full Text.
W MEDERSKI +4 more
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Synthetic methods for α-substituted cyclic α,β-enones
Tetrahedron, 2003AbstractFor Abstract see ChemInform Abstract in Full Text.
Farhat Rezgui +2 more
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Journal of Combinatorial Chemistry, 2001
Efficient methods for the solid-phase synthesis of imidazoline-tethered 2,3-diketopiperazines, cyclic ureas, and cyclic thioureas are described. Following the exhaustive reduction of resin-bound dipeptides derived from orthogonally protected diamino acids, the primary amine of the resulting tetraamines was selectively protected with Dde.
A N, Acharya +2 more
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Efficient methods for the solid-phase synthesis of imidazoline-tethered 2,3-diketopiperazines, cyclic ureas, and cyclic thioureas are described. Following the exhaustive reduction of resin-bound dipeptides derived from orthogonally protected diamino acids, the primary amine of the resulting tetraamines was selectively protected with Dde.
A N, Acharya +2 more
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Poly(cyclic imino ether)s Beyond 2‐Substituted‐2‐oxazolines
Macromolecular Rapid Communications, 2011Abstract2‐Oxazolines (2‐OZO) are 5‐membered cyclic imino ethers whose cationic ring‐opening polymerization (CROP) mechanism and resulting polymer properties are extensively studied. However, also 6‐ and 7‐membered cyclic imino ethers can be polymerized via CROP. Together with the much less studied 4‐ and 5‐substituted main‐chain chiral poly(2‐oxazoline)
Bloksma, M.M. +2 more
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ChemInform Abstract: GEM‐DIMETHYL‐SUBSTITUTED CYCLIC ANHYDRIDES
Chemischer Informationsdienst, 1973AbstractDurch Erhitzen der Tetramethyl‐dicarbonsäuren (I) mit Acetanhydrid lassen sich die Anhydride (IIa) bzw. (IIb) gewinnen; neben (IIa) werden auch das Dimere von (IIa) sowie höhere cyclische Analoge gebildet.
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369. Substituted unsaturated cyclic ketones
Journal of the Chemical Society (Resumed), 1935A. Cohen, J. W. Cook
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Synthesis of α‐substituted cyclic sulfides
Journal of Heterocyclic Chemistry, 1969D. L. Tuleen, R. H. Bennett
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