Chromium and Molybdenum Carbonyl Complexes of C7Ph7H and C7Ph5Me2H and of C7Ph7H(CO), the Diels-Alder Adduct of Tetracyclone and Triphenylcyclopropene: Variable-Temperature NMR and X-ray Crystallographic Study

1995 ◽  
Vol 14 (3) ◽  
pp. 1139-1151 ◽  
Author(s):  
Lisa C. F. Chao ◽  
Hari K. Gupta ◽  
Donald W. Hughes ◽  
James F. Britten ◽  
Suzie Rigby ◽  
...  
Keyword(s):  
Variable Temperature ◽  
Diels Alder ◽  
Carbonyl Complexes ◽  
X Ray ◽  
Crystallographic Study ◽  
Molybdenum Carbonyl ◽  
Alder Adduct

Structural Study of an Unusual Diels-Alder Adduct

1992 ◽  
Vol 45 (12) ◽  
pp. 2089 ◽  
Author(s):  
EL Ghisalberti ◽  
BW Skelton ◽  
AH White
Keyword(s):  
Single Crystal ◽  
Diffraction Study ◽  
Structural Study ◽  
Spectroscopic Studies ◽  
Diels Alder ◽  
X Ray Diffraction ◽  
X Ray ◽  
Naturally Occurring ◽  
Chemical Evidence ◽  
Alder Adduct

The structure of the compound obtained on heating the naturally occurring clerodane furanoditerpene (1) had been formulated as (2) on the basis of spectroscopic studies. A single-crystal X-ray diffraction study on the dihydro derivative of (2) has confirmed this and provides support for the stereochemistry previously assigned to (1) on the basis of chemical evidence.

Synthesis and x-ray structure of a Diels-Alder adduct of fullerene C60

1993 ◽  
Vol 115 (1) ◽  
pp. 344-345 ◽  
Author(s):  
Yves Rubin ◽  
Saeed Khan ◽  
Daron I. Freedberg ◽  
Chahan Yeretzian
Keyword(s):  
Diels Alder ◽  
Fullerene C60 ◽  
X Ray ◽  
Alder Adduct

scholarly journals Novel reaction of 3,4-dibromofuran with azo diesters to give tetrahydropyridazinones

RSC Advances ◽  
2016 ◽  
Vol 6 (27) ◽  
pp. 22969-22972 ◽  
Author(s):  
Kati M. Aitken ◽  
R. Alan Aitken ◽  
Alexandra M. Z. Slawin
Keyword(s):  
Nmr Spectroscopy ◽  
Variable Temperature ◽  
Diels Alder ◽  
X Ray Diffraction ◽  
X Ray

Diels–Alder cycloaddition followed by rearrangement gives unexpected heterocyclic products whose structure is investigated by variable-temperature NMR spectroscopy and X-ray diffraction.

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.

Diels−Alder Dimerization of Cyclopenta[l]phenanthrene (Dibenz[e,g]indene) with Isodibenzindene:  A Computational, NMR Spectroscopic, and X-ray Crystallographic Study

1998 ◽  
Vol 63 (11) ◽  
pp. 3735-3740 ◽  
Author(s):  
Suzie S. Rigby ◽  
Mark Stradiotto ◽  
Stacey Brydges ◽  
David L. Pole ◽  
Siden Top ◽  
...  
Keyword(s):  
Diels Alder ◽  
X Ray ◽  
Crystallographic Study

ChemInform Abstract: Synthesis and X-Ray Structure of a Diels-Alder Adduct of C60.

ChemInform ◽  
2010 ◽  
Vol 24 (19) ◽  
pp. no-no
Author(s):  
Y. RUBIN ◽  
S. KHAN ◽  
D. I. FREEDBERG ◽  
C. YERETZIAN
Keyword(s):  
Diels Alder ◽  
X Ray ◽  
Alder Adduct

Photochemical Isomerization of (E,Z)-1,5-Bis(9-anthryl)penta-1,4-dien-3-one and its Intramolecular Diels-Alder Adduct

1985 ◽  
Vol 38 (10) ◽  
pp. 1471 ◽  
Author(s):  
H Becker ◽  
BW Skelton ◽  
AH White
Keyword(s):  
Molecular Structure ◽  
Diels Alder ◽  
X Ray Diffraction ◽  
Skeletal Rearrangement ◽  
X Ray ◽  
Photochemical Isomerization ◽  
Alder Adduct

Photoexcitation of (E,Z)-1,5-bis(9-anthryl)penta-1,4-dien-3-one (2) leads to 4-(9-anthryl)-4,5-dihydro-5,9b[1′,2′]-benzeno-9bH- benz [e]indene-3(3aH)-one (3) which is formed by an intramolecular Diels -Alder addition. Upon irradiation, (3) undergoes a skeletal rearrangement to give a product (4), rationalized in terms of a stepwise reaction involving diradical intermediates. The molecular structure of (4) has been established by X-ray diffraction, and the stereochemistry of (3) deduced from the results of X-ray diffraction studies of its reduction products (5) and (6).

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