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note
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Cyclopropane derivatives 1a-c were prepared conveniently in good yield by a rhodium-catalyzed carbene insertion reaction of the corresponding diazo-compound with allyltrimethylsilane. 1a, 1b, and 1c were, respectively, 2.2:1, 1.5:1, and 1.7:1 mixtures of the anti and syn isomers and were used as such for reactions.
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1H chemical shifts of the hydrogen on the carbinol carbon. The hydrogen resonated 0.06-0.12 ppm downfield in the syn isomer compared to the hydrogen in the corresponding anti isomer. Furthermore, this hydrogen appeared as a triplet (J = 1.7-6.3 Hz) and a doublet (J = 4.6-5.8 Hz) or a broad singlet, respectively, in the anti and syn aldol products obtained from arylaldehydes. For references related to the syn and anti assignments, see: (a) Ohtsuka, Y.; Koyasu, K.; Ikeno, T.; Yamada, T. Org. Lett. 2001, 3, 2543. (b) Denmark, S. E.; Wong, K.-T.; Stavenger, R. A. J. Am. Chem. Soc. 1997, 119, 2333. (c) Hasegawa, E.; Ishiyama, K.; Kato, T.; Horaguchi, T.; Shimizu, T.; Tanaka, S.; Yamashita, Y. J. Org. Chem. 1992, 57, 5352. (d) Noyori, R.; Nishida, I.; Sakata, J. J. Am. Chem. Soc. 1981, 103, 2106. (e) House, H. O.; Crumrine, D. S. ; Teranishi, A. Y.; Olmstead, H. D. J. Am. Chem. Soc. 1973, 95, 3310.
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0030933807
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1H chemical shifts of the hydrogen on the carbinol carbon. The hydrogen resonated 0.06-0.12 ppm downfield in the syn isomer compared to the hydrogen in the corresponding anti isomer. Furthermore, this hydrogen appeared as a triplet (J = 1.7-6.3 Hz) and a doublet (J = 4.6-5.8 Hz) or a broad singlet, respectively, in the anti and syn aldol products obtained from arylaldehydes. For references related to the syn and anti assignments, see: (a) Ohtsuka, Y.; Koyasu, K.; Ikeno, T.; Yamada, T. Org. Lett. 2001, 3, 2543. (b) Denmark, S. E.; Wong, K.-T.; Stavenger, R. A. J. Am. Chem. Soc. 1997, 119, 2333. (c) Hasegawa, E.; Ishiyama, K.; Kato, T.; Horaguchi, T.; Shimizu, T.; Tanaka, S.; Yamashita, Y. J. Org. Chem. 1992, 57, 5352. (d) Noyori, R.; Nishida, I.; Sakata, J. J. Am. Chem. Soc. 1981, 103, 2106. (e) House, H. O.; Crumrine, D. S. ; Teranishi, A. Y.; Olmstead, H. D. J. Am. Chem. Soc. 1973, 95, 3310.
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0001581517
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1H chemical shifts of the hydrogen on the carbinol carbon. The hydrogen resonated 0.06-0.12 ppm downfield in the syn isomer compared to the hydrogen in the corresponding anti isomer. Furthermore, this hydrogen appeared as a triplet (J = 1.7-6.3 Hz) and a doublet (J = 4.6-5.8 Hz) or a broad singlet, respectively, in the anti and syn aldol products obtained from arylaldehydes. For references related to the syn and anti assignments, see: (a) Ohtsuka, Y.; Koyasu, K.; Ikeno, T.; Yamada, T. Org. Lett. 2001, 3, 2543. (b) Denmark, S. E.; Wong, K.-T.; Stavenger, R. A. J. Am. Chem. Soc. 1997, 119, 2333. (c) Hasegawa, E.; Ishiyama, K.; Kato, T.; Horaguchi, T.; Shimizu, T.; Tanaka, S.; Yamashita, Y. J. Org. Chem. 1992, 57, 5352. (d) Noyori, R.; Nishida, I.; Sakata, J. J. Am. Chem. Soc. 1981, 103, 2106. (e) House, H. O.; Crumrine, D. S. ; Teranishi, A. Y.; Olmstead, H. D. J. Am. Chem. Soc. 1973, 95, 3310.
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0001438016
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1H chemical shifts of the hydrogen on the carbinol carbon. The hydrogen resonated 0.06-0.12 ppm downfield in the syn isomer compared to the hydrogen in the corresponding anti isomer. Furthermore, this hydrogen appeared as a triplet (J = 1.7-6.3 Hz) and a doublet (J = 4.6-5.8 Hz) or a broad singlet, respectively, in the anti and syn aldol products obtained from arylaldehydes. For references related to the syn and anti assignments, see: (a) Ohtsuka, Y.; Koyasu, K.; Ikeno, T.; Yamada, T. Org. Lett. 2001, 3, 2543. (b) Denmark, S. E.; Wong, K.-T.; Stavenger, R. A. J. Am. Chem. Soc. 1997, 119, 2333. (c) Hasegawa, E.; Ishiyama, K.; Kato, T.; Horaguchi, T.; Shimizu, T.; Tanaka, S.; Yamashita, Y. J. Org. Chem. 1992, 57, 5352. (d) Noyori, R.; Nishida, I.; Sakata, J. J. Am. Chem. Soc. 1981, 103, 2106. (e) House, H. O.; Crumrine, D. S. ; Teranishi, A. Y.; Olmstead, H. D. J. Am. Chem. Soc. 1973, 95, 3310.
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1H chemical shifts of the hydrogen on the carbinol carbon. The hydrogen resonated 0.06-0.12 ppm downfield in the syn isomer compared to the hydrogen in the corresponding anti isomer. Furthermore, this hydrogen appeared as a triplet (J = 1.7-6.3 Hz) and a doublet (J = 4.6-5.8 Hz) or a broad singlet, respectively, in the anti and syn aldol products obtained from arylaldehydes. For references related to the syn and anti assignments, see: (a) Ohtsuka, Y.; Koyasu, K.; Ikeno, T.; Yamada, T. Org. Lett. 2001, 3, 2543. (b) Denmark, S. E.; Wong, K.-T.; Stavenger, R. A. J. Am. Chem. Soc. 1997, 119, 2333. (c) Hasegawa, E.; Ishiyama, K.; Kato, T.; Horaguchi, T.; Shimizu, T.; Tanaka, S.; Yamashita, Y. J. Org. Chem. 1992, 57, 5352. (d) Noyori, R.; Nishida, I.; Sakata, J. J. Am. Chem. Soc. 1981, 103, 2106. (e) House, H. O.; Crumrine, D. S. ; Teranishi, A. Y.; Olmstead, H. D. J. Am. Chem. Soc. 1973, 95, 3310.
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