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EXAMPLE 3; In yet another embodiment, the functionalized lactone comprises a carboxy protecting group, as shown in FIG. 10. Ylide synthesis is shown below using the reagents and conditions: (a) PPh3, C6H6, 12 h, rt; (b) 20percent NaOH(aq), 5 h, rt.
96%
at 60 - 62℃; for 4.41 h; Industry scale
30 liters of toluene was taken into a reactor and 3.2 kg of triphenyl phosphine was added to it under a nitrogen atmosphere. Another 2 liters of toluene was added to the reactor and stirred for about 25 minutes. The reaction mass was then heated to about 60° C. and 2.9 kg of tertiary-butyl bromo acetate was added to the reaction mass at 60° C. Temperature of the reaction mass was then raised to 62° C. and maintained for 4 hours. Reaction completion was checked using thin layer chromatography. After the reaction was completed, the reaction mass was cooled to about 35° C. and filtered. The filtered cake was washed with 9.5 liters of toluene. The wet solid was dried at 60° C. for 4 hours to yield 5.36 kg (96percent yield) of the title compound. Purity by HPLC: 99.1 area-percent.
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