scholarly journals Mono‐Gold(I)‐Catalyzed Enantioselective Intermolecular Reaction of Ynones with Styrenes: Tandem Diels–Alder and Ene Sequence

2021 ◽  
Vol 104 (2) ◽  
Author(s):  
Masaki Nanko ◽  
Yuya Inaba ◽  
Keisuke Sekine ◽  
Koichi Mikami
Keyword(s):  
Diels Alder ◽  
Intermolecular Reaction

scholarly journals Correlation between Yield and Reduced Mass of Raw Materials in Intermolecular and Intramolecular Cyclization Reactions

2020 ◽  
Author(s):  
Masatoshi Kawashima
Keyword(s):  
Intramolecular Cyclization ◽  
Raw Materials ◽  
Reaction System ◽  
Diels Alder ◽  
Regression Equation ◽  
Reaction Site ◽  
Coupling Reactions ◽  
Cyclization Reactions ◽  
Intermolecular Reaction ◽  
Intermolecular Reactions

Correlation between yield and reduced mass of raw materials in intramolecular C-N, C-C, C-O coupling reactions and intramolecular/intermolecular Diels-Alder reactions was revealed. The regression equation was found to be the same as that of intermolecular reactions; yield = -0.1861<i>M</i><sub>AB</sub>/(<i>n</i><sub>A</sub><i>n</i><sub>B</sub><i>n</i><sub>I</sub>)+100.0, where <i>M</i><sub>AB</sub> is the reduced mass per mole and <i>n</i><sub>A</sub> and <i>n</i><sub>B</sub> are the total number of each reaction site in molecular A and molecular B in the reaction system, and <i>n</i><sub>I</sub> is the number to distinguish whether it is a intramolecular reaction or intermolecular reaction.

Cross-Linked Polyamides

2002 ◽  
Vol 10 (4) ◽  
pp. 315-324
Author(s):  
H.S. Patel ◽  
V.C. Patel
Keyword(s):  
Diels Alder ◽  
Spectral Studies ◽  
Reinforced Composites ◽  
Intermolecular Reaction ◽  
Glass Fibre Reinforced ◽  
Ft Ir ◽  
Glass Fibre Reinforced Composites ◽  
By Products ◽  
Fibre Reinforced Composites

Cross linked polyimides containing a s-triazine ring have been synthesized via the Diels-Alder intermolecular polymerization of 2,4,6-tris(2-furanyl methyl imino)-1,3,5-triazine with various bis(maleimide) compounds, followed by the aromatization of the corresponding Diels-Alder products. All the poly(imino- s-triazine imide)s were characterized by elemental analysis, FT-IR spectral studies and thermogravimetry. Glass fibre reinforced composites were prepared via an in-situ Diels-Alder intermolecular reaction between 2,4,6-tris(2-furanyl methyl imino)-1,3,5-triazine and various bis(maleimide) compounds without evolution of by-products. The resulting composites were characterized by mechanical properties.

Synthesis Characterization and Glass Reinforcement of Poly(urethane-imide)s-III

1992 ◽  
Vol 4 (4) ◽  
pp. 247-257 ◽  
Author(s):  
Hasmukh S. Patel ◽  
Vipul J. Shah ◽  
Hemant S. Vyas
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Chemical Resistance ◽  
Fibre Composite ◽  
Diels Alder ◽  
Spectral Studies ◽  
Intermolecular Reaction ◽  
Glass Reinforcement ◽  
Glass Fibre Composite

Poly(urethane-imide)s (PUIs) were prepared by the intermolecular Diels-Alder (DA) reaction of methylenedi-4,1-phenylenebis(2-furanyl-methylcarb-amate) (MPBFC) with various bismaleimides. The DA reaction was carried out in 1,4-dioxane as solvent as well as in bulk, followed by aromatization of tetrahydro-phthalimide intermediates in the presence of acetic anhydride. All the polymers were characterized by elemental analysis, IR spectral studies and thermogravfmetry. The PUts exhibit moderate thermal stability. MPBFC and bismaleimides were polymerized (at 145 + 10 C) by an in situ DA intermolecular reaction into moderately thermally stable PUls-glass fibre composite (i.e. laminates) and were characterized by their chemical resistance and mechanical properties.

scholarly journals Correlation between Yield and Reduced Mass of Raw Materials in Intermolecular and Intramolecular Cyclization Reactions

2020 ◽  
Author(s):  
Masatoshi Kawashima
Keyword(s):  
Intramolecular Cyclization ◽  
Raw Materials ◽  
Reaction System ◽  
Diels Alder ◽  
Regression Equation ◽  
Reaction Site ◽  
Coupling Reactions ◽  
Cyclization Reactions ◽  
Intermolecular Reaction ◽  
Intermolecular Reactions

Correlation between yield and reduced mass of raw materials in intramolecular C-N, C-C, C-O coupling reactions and intramolecular/intermolecular Diels-Alder reactions was revealed. The regression equation was found to be the same as that of intermolecular reactions; yield = -0.1861<i>M</i><sub>AB</sub>/(<i>n</i><sub>A</sub><i>n</i><sub>B</sub><i>n</i><sub>I</sub>)+100.0, where <i>M</i><sub>AB</sub> is the reduced mass per mole and <i>n</i><sub>A</sub> and <i>n</i><sub>B</sub> are the total number of each reaction site in molecular A and molecular B in the reaction system, and <i>n</i><sub>I</sub> is the number to distinguish whether it is a intramolecular reaction or intermolecular reaction.

Polyimides Containing an s-Triazine Ring

2000 ◽  
Vol 12 (1) ◽  
pp. 225-235 ◽  
Author(s):  
H S Patel ◽  
V C Patel
Keyword(s):  
Diels Alder ◽  
Spectral Studies ◽  
Reinforced Composites ◽  
Intermolecular Reaction ◽  
Glass Fibre Reinforced ◽  
Glass Fibre Reinforced Composites ◽  
By Products ◽  
Fibre Reinforced Composites ◽  
Chemical Resistivity

A series of new polyimides containing an s-triazine nucleus were prepared via Diels–Alder (DA) intermolecular polymerization of 2,6-bis(2-furanyl methyl imino)-4-ethoxy-1,3,5-triazine with different bis(maleimide) compounds. The DA reaction was carried out in tetrahydrofuran as solvent, as well as in bulk followed by aromatization of poly(tetrahydrophthalimido)-intermediates in the presence of acetic anhydride. All the poly(imino- s-triazine imide)s were characterized by elemental analysis, IR spectral studies and thermogravimetry. Glass fibre reinforced composites were prepared via in situ Diels–Alder intermolecular reaction between 2,6-bis(2-furanyl methyl imino)-4-ethoxy-1,3,5-triazine and different bis(maleimide) compounds without evolution of by-products. The prepared composites were characterized by chemical resistivity and mechanical properties.

The Diels-Alder Reaction of 2-Ethenyl-1,4-Benzodioxin: A New and Simple Synthesis of Bisaryl Ethers

Synlett ◽  
1989 ◽  
Vol 1989 (01) ◽  
pp. 30-32
Author(s):  
Thomas V. Lee ◽  
Alistair J. Leigh ◽  
Christopher B. Chapleo
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Simple Synthesis ◽  
Diels Alder Reaction

2-NITROBENZOFURAN AS DIENOPHILE IN DIELS-ALDER REACTIONS. A SIMPLE DIBENZOFURANS SYNTHESIS

2009 ◽  
Author(s):  
Pedro Mancini ◽  
Maria Kneeteman ◽  
Claudia Della Rosa
Keyword(s):  
Diels Alder

Trienamines: Their Key Role in Extended Organocatalysis for Diels-Alder Reactions

2013 ◽  
Vol 1 ◽  
Author(s):  
Silvia Reboredo ◽  
Alejandro Parra ◽  
José Alemán
Keyword(s):  
Diels Alder
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