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3 (37 mL, 0.40 mol) cooled to 5°C, bromine (20.6 mL, 0.40 mol) was introduced dropwise while the mixture was stirred with a glass rod, giving a deep orange solid. To this solid was slowly introduced water (7.2 mL, 0.40 mol) (CARE: EXOTHERMIC), and mixing was continued between additions. The resulting orange slush was transferred to a round-bottomed flask and distilled under vacuum (20 Torr) using a warm condenser (to prevent solidification in and blocking of the condenser). Fractions were collected between 92 and 120°C (head temperature). Yield fraction 1 (<100°C head temperature, 37.7 g, 33%), total yield (98.7 g, 87%). The first fraction collected (<100°C) was a pale orange semisolid and was found to be superior to higher boiling fractions (colorless, crystalline solid mass) for the bromination of pyridone 11.
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Kelly, T.R.1
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77
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For examples, see: (a) Kelly, T. R.; Bowyer, M. C.; Bhaskar, K. V.; Bebbington, D.; Garcia, A.; Lang, F.; Kim, M. H.; Jette, M. P. J. Am. Chem. Soc. 1994, 116, 3657. (b) Kelly, T. R.; Garcia, A.; Lang, F.; Walsh, J. J.; Bhaskar, K. V.; Boyd, M. R.; Götz, R.; Keller, P. A.; Walter, R.; Bringmann, G. Tetrahedron Lett. 1994, 35, 7621. (c) Kelly, T. R.; Xu, W.; Sundaresan, J. Tetrahedron Lett. 1993, 34, 6173. (d) Kelly, T. R.; Kim, M. H. J. Org. Chem. 1992, 57, 1593. (e) Kelly, T. R.; Bridger, G. J.; Zhao, C. J. Am. Chem. Soc. 1990, 112, 8024. (f) Kelly, T. R.; Li, Q.; Bhushan, V. Tetrahedron Lett. 1990, 37, 161.
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Kelly, T.R.1
Li, Q.2
Bhushan, V.3
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van Esch, J. H.; Hoffmann, M. A. M.; Nolte, R. J. M. J. Org. Chem. 1983, 48, 283.
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Van Esch, J.H.1
Hoffmann, M.A.M.2
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0000311719
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Coulson, D.R.1
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81
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85033155608
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For typical experimental protocols, see ref 26a
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For typical experimental protocols, see ref 26a.
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82
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0003601534
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Merck & Co., Inc.: Rahway, NJ, entry 8519
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2 should be handled under an atmosphere of nitrogen, and if a yellow color develops it should be disposed of, see: Merck Index, 11th ed.; Merck & Co., Inc.: Rahway, NJ, 1989; entry 8519.
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(1989)
Merck Index, 11th Ed.
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83
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85033138443
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Filtration under vacuum results in exothermic reaction of the excess sodium amide with atmospheric moisture, resulting in charring/ destruction of the product
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Filtration under vacuum results in exothermic reaction of the excess sodium amide with atmospheric moisture, resulting in charring/ destruction of the product.
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85
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0002714675
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Still, W. C.; Kahn, M.; Mitra, A. J. Org. Chem. 1978, 43, 2923.
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Still, W.C.1
Kahn, M.2
Mitra, A.3
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86
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85033148466
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note
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13C NMR spectrum.
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87
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85033149031
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4 409.2127, found 409.2125
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4 409.2127, found 409.2125.
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88
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0040879743
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Longman Scientific & Technical: Harlow
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2) cycles (×3), making quantitative measurement difficult. By insertion of a pressure equalizing dropping funnel containing the alkyne solution above the reaction flask containing the Lindlar catalyst solution, it was possible to degas without concommitant hydrogenation. Following degassing, the alkyne solution was quickly dropped into the catalyst solution whereupon hydrogenation commenced.
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(1991)
Vogel's Textbook of Practical Organic Chemistry, 5th Ed.
, pp. 89
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Vogel, A.I.1
Furniss, B.S.2
Hannaford, A.J.3
Smith, P.W.G.4
Tatchell, A.R.5
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89
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85033150472
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Stannane 25 was observed to undergo facile destannylation on silica gel
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Stannane 25 was observed to undergo facile destannylation on silica gel.
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