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The compound of formula 2 (Z=trifluoromethylsulphonyloxy), methyl 3-(3-allyl-4-trifluoromethylsulphonyloxyphenyl)methyloxyacetate, was prepared as follows. Allyl bromide (4.4 g) was added to a stirred suspension of 4-hydroxybenzyl alcohol (4.34 g) and potassium carbonate (5.00 g) in butanone (40 ml). The reaction mixture was heated at reflux for 18 hours. The reaction mixture was cooled and then filtered. The filtrate was evaporated to give an oil which was purifed by flash column chromatography on silica gel using a 4:1 (v/v) mixture of hexane and ethyl acetate as eluent to give 4-allyloxybenzyl alcohol (4.50 g) as a pale yellow oil; NMR(CDCl3): 1.81(1H,t), 4.48-4.65(4H,m), 5.22-5.48(2H,m), 6.05(1H,m), 6.90(2H,m) and 7.25(2H,m), m/z 164(H).

1. temperatureThe reaction mixture was heated
2. temperatureat reflux for 18 hours
3. temperatureThe reaction mixture was cooled
4. filtrationfiltered
5. customThe filtrate was evaporated
6. customto give an oil which