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Thomson, R. H. Naturally Occurring Quinones IV; Blackie Academic and Professional: London, 1997, and preceding editions.
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33847387078
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General Procedure for the Allylation Reaction of Lawsone under Neat Conditions. A mixture of lawsone (157 mg, 0.9 mmol, Pd(Ph 3P)4 (50 mg, 0.045 mmol, AcOH (6 mg, 0.09 mmol, ca. 2 drops) and the proper allylating agent (alcohol or ester, 1.5 mmol) was thoroughly mixed and was put in an oven preheated at 100°C. After 35 min the gummy material was subjected to column chromatography (silica gel, hexane-EtOAc, 5:1) to afford the allyl derivatives 8a-e. Representative Data for Allylation Products. 2-Hydroxy-3-(3-phenylallyl)-1,4-naphthoquinone (8b, mp 168-170°C (lit.18 170°C, IR (KBr, v, 3289, 1671, 1641 cm-1. 1H NMR (300 MHz, CDCl3, δ, 8.14 (1 H, d, J, 7.3 Hz, 8.09 (1 H, d, J, 7.3 Hz, 7.77 (1 H, t, J, 7.3 Hz, 7.69 (1 H, t, J, 7.3 Hz, 7.41 (1 H, s, OH, 7.35-7.17 (5 H, m, 6.57 (1 H, d, J, 15.9 Hz, 6.30 1 H, dt, J1
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3: C, 78.61; H, 4.86. Found: C, 78.42; H, 4.89.
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19
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33847394487
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16
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16
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McLamore, W.M.5
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