P e r s o n a l A c c o u n t
T H E C H E M I C A L R E C O R D
6.99 (d, J = 8.2 Hz, 2H), 6.50 (d, J = 5.7 Hz, 1H), 6.48 (d,
J = 5.7 Hz, 1H), 6.15 (d, J = 8.0 Hz, 1H), 6.12 (d, J = 8.0 Hz,
1H), 2.44 (s, 3H), 2.43 (s, 3H), 2.37 (s, 3H), 2.35 ppm (s,
3H). The molar ratio of C3-symmetric and unsymmetric
isomers is approximately 1:3, as determined by the integral
ratio. The number of protons is based on the unsymmetric
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1
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NMR (400 MHz, CD2Cl2): δ = 7.26 (s, 2H), 7.19–7.13 (m,
8H), 4.77 (d, 2H),[a] 4.72 (d, 4H),[a] 3.62 (d, J = 20.2 Hz,
2H), 3.48 (d, J = 19.7 Hz, 2H), 3.46 ppm (d, J = 19.2 Hz,
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Hz, 4H), 7.17 (d, J = 7.8 Hz, 4H), 7.14 (s, 4H), 4.74 (d,
J = 19.2 Hz, 4H), 4.43 (s, 2H), 3.47 ppm (d, J = 19.2 Hz,
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1
[34] T. Amaya, H.-L. Wu, T. Hirao, unpublished results. 33: H
NMR (750 MHz, CD2Cl2): δ = 6.92 (s, 2H), 3.19 (m, 2H),
2.99 (t, J = 8.3 Hz, 2H), 2.90 (quin, J = 6.8 Hz, 2H), 2.80 (br
s, 2H), 2.49 (d, J = 15 Hz, 2H), 2.09 (m, 2H), 1.58–1.52 (m,
2H), 1.41 (m, 2H), 1.30–1.12 (m, 4H), 1.07 (br s, 1H), 0.59
(br s, 1H) ppm; MS (EI): m/z: 276 [M]+.
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Chem. Rec. 2014, ••, ••–••
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