The colourless crystalline form of the benzoylpyrazolone (2) has molecules with the NH structure (2c) stabilized by intermolecular hydrogen bonds. At room temperature crystals are monoclinic: P21/c, a 13.508(5),
b 9.124(4), c 11.451(3)Ǻ, β 90.80(3)°, Z4; the structure was refined to R 0.059, Rw 0.048. The acetoacetylpyrazolone (3) has the OH structure (3c) with two intramolecular hydrogen bonds. At 193 K crystals are triclinic: Pī , a 7.142(2), b 13.704(8), c 14.699(7)Ǻ, α 117.36(3), β 96.87(3),
γ 93.73(3)°, Z 4; the structure was refined to R 0.049, Rw 0.054.
The Diels -Alder reactions between hemicyclone and a number of substituted benzoquinones are reported. Photolysis of the products produces pentacyclo [5,4,0,02,6,03,10,05,9] undecane derivatives and/or 2- oxapentacyclo [6,4,0,01,4,03,7,05,9] dodecane derivatives depending on the substituents. X-ray crystal structures of oxetan (8) and cyanohydrin (33) are also reported.
The crystal structures of exo- and endo- 1,7,8,9- tetraphenyltricyclo [5.2.1.02,6]deca-3,8-dien-10-one (8) and (9) are reported. Crystals of the exo adduct (8) are triclinic: Pī , a 9.863(2), b 10.738(2), c 13.634(2) Ǻ, α 82.90(1), β 68.87(1), γ 66.87(1)°, Z 2; crystals of the endo adduct (9) are monoclinic: P21/c, a 11.610(1), b 7.862(2), c 27.675(3) Ǻ, β 100.223(9)°, Z 4. The structures were refined to R 0.039 and 0.049 respectively. The relative orientations of the four phenyl rings in the two structures are similar.
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