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0013980195
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54
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37649020112
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See Ref. 15e.
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55
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37649011124
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note
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3, 100 MHz): 48.6, 52.9, 56.2, 57.1, 60.8, 101.9, 104.7, 107.3, 113.3, 115.1, 133.3, 135.7, 137.0, 147.2, 147.7, 153.2, 167.5.
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56
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37649008712
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note
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3, 100 MHz): 40.5, 52.1, 52.3, 52.9, 56.0, 60.7, 63.4, 101.8, 107.3, 109.4, 113.0, 116.7, 119.1, 132.4, 132.6, 134.7, 136.7, 146.9, 147.3, 152.4, 170.7, 171.2.
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57
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37649011546
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note
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3, 100 MHz): 33.0, 49.6, 52.4, 52.9, 56.0, 59.3, 60.8, 101.1, 102.9, 107.0, 109.4, 110.1, 126.8, 131.3, 136.0, 137.2, 138.1, 147.1, 148.3, 152.8, 169.7, 170.6.
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58
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37649025612
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note
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Although the yield of this step (65%) is somewhat lower to the calculated global yield of the two separated steps (86%), the success of the pseudo-domino sequence represents an interesting goal from the conceptual (as it validates the feasibility of the principle) as well as practical viewpoint (as it saves a work-up procedure and a purification step).
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59
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37649023357
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note
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4, and the solvent was removed in vacuo. The crude product was purified by flash chromatography (cyclohexane/ethyl acetate 8/2) to afford cyclic diester 4 in 65% yield.
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60
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37649007358
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note
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3, 100 MHz): 38.3, 49.8, 52.9, 53.4, 56.1, 60.0, 60.8, 102.0, 105.5, 106.6, 108.8, 126.3, 132.7, 137.7, 140.3, 147.9, 153.2, 153.4, 168.3, 169.9, 192.8.
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