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A mixture of 22.8 g. of methyl angelate, 10 g. of 3-methyl-2-pentenol, 80 ml. of toluene and 1 g. of dioctyltin acetate was placed in a 300 ml. glass flask, which was equipped with a Soxhlet extractor filled on the top with molecular sieve 4A and a reflux cooler. The above mixture was heated under continuous reflux while returning the refluxed liquid through the molecular sieve 4A to the flask. The mixture resulted from the heating for a total of 17 hours was subjected to single distillation to give 14.2 g. of a distillate boiling at 115° C. (22 mmHg). The distillate was further subjected to rectification to give 9.70 g. of a distillate boiling at 115° C. (22 mmHg). Analysis of the compound by gaschromatography (Column: Silicone SE-52, 2%/chromosorb GHP) indicated a purity of 99.403% in terms of the area ratio. Refractive index (D ray, 20° C.) was 1.463. Infrared spectrum (liquid film) had absorptions at 2850-3020, 1720, 1670, 1650, 1455, 1385, 1350, 1255, 1225, 1155, 1080, 1040, 960, 845 and 760 cm-1.

1. additionA mixture of 22.8 g
2. customglass flask, which was equipped with a Soxhlet extractor
3. temperatureThe above mixture was heated
4. temperatureunder continuous reflux
5. customThe mixture resulted from the heating for a total of 17 hours
6. distillationwas subjected to single distillation
7. customto give 14.2 g
8. customto give 9.70 g
9. customRefractive index (D ray, 20° C.)