Side-chain free aromatic polyimides containing anthracene units via Diels-Alder precursors

2009 ◽  
Vol 112 (5) ◽  
pp. 2953-2958 ◽  
Author(s):  
Saral Shah ◽  
Ruhai Tian ◽  
Zheng Shi ◽  
Yi Liao
Keyword(s):  
Diels Alder ◽  
Side Chain ◽  
Aromatic Polyimides

Two-Step Synthesis of Side-Chain Aromatic Polyimides for Second-Order Nonlinear Optics

1996 ◽  
Vol 29 (2) ◽  
pp. 535-539 ◽  
Author(s):  
Tian-An Chen ◽  
Alex K-Y. Jen ◽  
Yongming Cai
Keyword(s):  
Nonlinear Optics ◽  
Second Order ◽  
Side Chain ◽  
Aromatic Polyimides

Total synthesis of mycophenolic acid

1997 ◽  
Vol 75 (6) ◽  
pp. 641-645 ◽  
Author(s):  
Ricardo A. de la Cruz ◽  
Francisco X. Talamás ◽  
Alfredo Vázquez ◽  
Joseph M. Muchowski
Keyword(s):  
Total Synthesis ◽  
Mycophenolic Acid ◽  
Alder Reaction ◽  
Diels Alder ◽  
Side Chain ◽  
Diels Alder Reaction

A total synthesis of mycophenolic acid is reported. Diels–Alder reaction of [5-methoxy-3-(1-methoxypropenyl)-4,5-dihydrofuran-2-yloxy]-trimethylsilane with 3-benzenesulfinyl-5H-furan-2-one afforded the hexasubstituted nucleus. The side chain was constructed from the unveiled aldehyde. Keywords: mycophenolic acid, Diels–Alder reaction, pentasubstituted diene.

Intramolecular diels-alder reactions of pyrazines with alkynylphenyl moieties as side-chain dienophiles

Tetrahedron ◽  
1990 ◽  
Vol 46 (10) ◽  
pp. 3641-3650 ◽  
Author(s):  
Norbert Haider ◽  
Henk C. van der Plas
Keyword(s):  
Diels Alder ◽  
Side Chain

The Two-step Synthesis and Crystal and Molecular Structure of Tetracyclo[6.4.0.02,11.04,9]dodec-6-ene-3,10-dione

1975 ◽  
Vol 53 (14) ◽  
pp. 2068-2075 ◽  
Author(s):  
Yuen-Mui Ngan ◽  
Steven J. Rettig ◽  
John R. Scheffer ◽  
James Trotter
Keyword(s):  
Crystal And Molecular Structure ◽  
Direct Methods ◽  
Membered Ring ◽  
Diels Alder ◽  
High Yield ◽  
Side Chain ◽  
X Ray ◽  
Long Wavelength ◽  
Vinyl Group ◽  
Alder Adduct

The photochemistry of the trans-1,3,5-hexatriene-p-benzoquinone Diels–Alder adduct has been investigated. Irradiation of this material in its long wavelength n → π* absorption band leads to a single photoproduct in high yield. A single crystal X-ray structure determination shows this product to be tetracyclo[6.4.0.02,11.04,9]dodec-6-ene-3,10-dione, the result of a novel regiospecific intramolecular 2 + 2 photoaddition between the side chain vinyl group and the enedione double bond. Crystals of tetracyclo[6.4.0.02,11.04,9]dodec-6-ene-3,10-dione are monoclinic, a = 7.5290(7), b = 19.072(1), c = 6.7237(4) Å, β = 107.918(6) °, Z = 4, space group P21/n. The structure was solved by direct methods and was refined by full-matrix least-squares procedures to a final R of 0.041 for 1603 reflections with I ≥ 3σ(I). The structure consists of well-separated molecular units. Bond distances are: C=O, 1.216 and 1.219(2), C=C, 1.318(2), mean C(sp3)—C(sp2), 1.508, mean C(sp3)—C(sp3), 1.560 in the four-membered ring and 1.544 elsewhere, mean C(sp3)—H, 0.99, and mean C(sp2)—H, 0.95 Å. Bond distances between nonhy drogen atoms have been corrected for thermal motion. A possible rationalization for the observed photoprocess is discussed in terms of conformational and radical stability effects.

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