Download PDF by Maretina I. Alexandrovna, Boris I. Ionin, John C.: Alkynes in Cycloadditions

By Maretina I. Alexandrovna, Boris I. Ionin, John C. Tebby(auth.)

ISBN-10: 1118615328

ISBN-13: 9781118615324

ISBN-10: 1118709314

ISBN-13: 9781118709313

Acetylene structures current a brand new path to cyclic compounds instead to more conventional equipment hired in classical natural chemistry. The synthesis of cyclic constructions in keeping with acetylene platforms has very important functions within the formation of nanostructures, certainly taking place compounds and chemosensory fabrics for the layout of nonlinear optics, digital and photonic devices.

Alkynes in Cycloadditions provides a latest evaluate of regioselective synthesis of fragrant and non-aromatic carbocyclic and heterocyclic ring platforms established totally on [2+2+2] and [4+2] cycloadditions, and different reactions of acetylenic devices together with enediynes and enyne-allenes.

Topics lined include:

  • New recommendations for the formation of fragrant and polynuclear hydrocarbons according to (Z)-hex-3-en-1,5-diyne and (Z)-hepta-1,2,4-triene-6-yne blocks.
  • One-step synthesis of benzene derivatives, β-substituted naphthalenes and acenes by means of the cycloaromatization of enediynes and enyne-allenes by means of Bergman, Myers-Saito and Shmittel.
  • Mechanisms of cycloaromatization leading to the formation of fulvene and indene systems.
  • Heterocyclization regarding enyne-carbodiimides.
  • New achievements in classical cycloaddition reactions comparable to the Diels-Alder condensation with acetylenic dienophiles and [2+2] cycloadditions with acetylene components

Alkynes in Cycloadditions offers a complete precis of the literature on tools for the synthesis of ring structures from acetylenes for tutorial researchers operating within the fields of natural synthesis, actual natural chemistry, organometallic chemistry, catalysis, fabrics technological know-how, nanomaterials and biochemistry.

Content:
Chapter 1 creation (pages 1–3):
Chapter 2 Regioselective Syntheses of Polysubstituted Benzenes Catalyzed by way of Transition steel Complexes (pages 5–105):
Chapter three Radical Cycloaromatization of structures Containing (Z)‐3‐hexene‐1,5‐diynes and (Z)‐1,2,4‐heptatrien‐6‐ynes and comparable Heteroatomic Blocks (pages 107–231):
Chapter four chosen Cycloaddition and Heterocyclization Reactions with strange Acetylenic and Allenic beginning Compounds (pages 233–247):
Chapter five Concluding feedback (pages 249–253):

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Additional resources for Alkynes in Cycloadditions

Sample text

TBS = tBu3Si. 119c (78%). 43 Model system for the cycloaddition of diyne-cyanohydrins. 4 HETEROHELICENS. ASYMMETRIC SYNTHESES Helicens are polycyclic aromatic hydrocarbons with with nonplanar helical frames formed from ortho-fused benzene or other aromatic rings [87]. The helicens and helicene-like molecules have for a long time attracted 34 ALKYNES IN CYCLOADDITIONS the attention of researchers because of their potential use for producing functional materials for electron optics [87]. 44) [88].

61a with two axial chiralities. Small amounts of the catalyst provide excellent enantioselectivity. The perfect dl/meso ratio and a high enantioselectivity were achieved after replacing the naphthyl groups in the acetylene branch by the ortho-substituted aryl groups (2-tolyl or 2-chlorophenyl). 61 [61]. 62, where the two axial chiralities are due to steric repulsion between the methyl groups of the Me-Duphos ligand and naphthyl groups of the diyne. 3 Intermolecular reaction of symmetrical diynes and monoalkynes.

172a,b. 2 Formation of Polycyclic Cyclohexadienes by Ru-catalyzed Cascade Reactions of 1,6-Diynes and Alkenes Inter- and intramolecular metal-catalyzed reactions involving [2+2+2] cycloaddition of alkynes are widely used for the synthesis of benzene and its polycyclic derivatives. However, similar reactions of alkynes with alkenes and allenes, forming 1,3-cyclohexadiene, have received much less attention. 7) [112]. 176a (R1 = CO2 Me, R2 = H) in 62% yield. 176e with 61% yield. 176k, in yields 67% and 25%, respectively.

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Alkynes in Cycloadditions by Maretina I. Alexandrovna, Boris I. Ionin, John C. Tebby(auth.)


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