B. R. Aa6ula et al. / Tetrahedron: Asymmetry 11 (2000) 4681–4686
4685
76%) as a colorless oil homogeneous by TLC, Rf 0.72 (hexanes); [h]2D5 −58.3 (c 0.3, CHCl3), lit.3b
1
[h]D −63 (c 1.6, CHCl3), lit.5b [h]D20 −59.6 (c 1.9, CHCl3); H NMR (CDCl3) l 7.24 (d, J=7.8 Hz,
2H), 7.09 (d, J=7.8 Hz, 2H), 2.54–2.44 (m, 1H), 2.32 (s, 3H), 1.84–1.63 (m, 4H), 1.59–1.50 (m,
1H), 1.26 (s, 3H), 1.06 (s, 3H), 0.56 (s, 3H); 13C NMR (CDCl3) l 144.5, 134.7, 128.2, 126.9, 50.2,
44.2, 39.7, 36.8, 26.4, 24.4, 24.3, 20.8, 19.8.
Acknowledgements
Partial support of this work by the University of Arizona through the Materials Characteriza-
tion Program is gratefully acknowledged.
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