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General Procedure for Yamamoto Benzyl Isocyanate [2 + 2 + 2] Cyclotrimerization(27). Vacuum-dried resin 4 (800 mg, 0.86 meq, 1.0 eq) was swollen with degassed DCE (20 mL) for 10 min. A stock solution of benzyl isocyanate and RuCp*(COD)Cl (40¡Ã1 molar ratio, 0.5 M isocyanate in DCE, 7 mL, 3.5 mmol isocyanate, 4.0 eq) was added and the slurry was stirred at 90 ¡ãC for 6 h. The resin was cooled, washed, and dried to afford pyrrolopyridones 27/27¡ä.

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lgq101(½ð±Ò+15, ·­ÒëEPI+1): лл~~~~~ 2011-08-25 21:18:21
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