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10. P. Karrer and co-workers, Helv. chim. Acta 15 (1932) 1218, 1399. 



11. J. Herzig and F. Faltis, Ann. 431 (1923) 40. 



12. I. J. RiNKES, Chem. Weekbl. 12 (1915) 996 and I. J. Rinkes and J. F. B. van Hasselt, 

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13. J. F. B. VAN Hasselt, Chem. Weekbl. 6 (1909) 480. 



14. J. Herzig and F. Faltis, Monatsh. 35 (1914) 997; Ber. 50 (1917) 927; Ann. 431 

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15. R. Kuhn, a. Winterstein and L. Karlovitz, Helv. chim. Acta 12 (1929) 64. — R. 

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16. I. J. Rinkes, Rec. 47 (1928) 934; 48 (1929) 603; 48 (1929) 1093- 



17. R. Kuhn and A. Winterstein, Ber. 65 (1932) 646. — Cf. R. Kuhn and L. Ehmann, 

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18. P. Karrer, F. Benz, R. More, H. Raudnitz, M. Stoll and T. Takahashi, Helv. 

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20. P. Karrer and F. Benz, Helv. chim. Acta 16 (1933) 337. 



21. R. Kuhn and A. Winterstein, Ber. 65 (1932) 1873. 



22. J. Herzig and F. Faltis, Ann. 431 (1923) 40. 



23. P. Karrer, A. Helfenstein, R. Widmer and T. B. van Itallie, Helv. chim. Acta 

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24. Cf. R. Kuhn and A. Winterstein, Ber. 65 (1932) 646; 66 (1933) 209. 



25. Cf. O. Walker, Dissertation, Zurich 1935. 



26. P. Karrer and U. Solmssen, Helv. chim. Acta 20 (1937) ^i9^- 



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29. P. Karrer and co-workers, Helv. chim. Acta 12 (1929) 754. Cf. Ref. 30. 



30. R. Kuhn and A. Winterstein, Ber. 65 (1932) 650. 



31. P. Karrer and co-workers, Helv. chim. Acta 12 (1929) 754. Cf. also R. Kuhn and 

 A. Winterstein, Ber. 65 (1932) 650. 



32. R. Kuhn and P. J. Drumm, Ber. 65 (1932) 1459. — R. Kuhn and co-workers, 65 (1932) 



1785. 



33. K. W. Hausser and A. Smakula, Z. angew. Chem. 47 (1934) 663; A. Smakula, 48 

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35. P. Karrer and U. Solmssen, Helv. chim. Acta 20 (1937) 1396. 



36. P. Karrer and co-workers, Helv. chim. Acta 12 (1929) 752. — Cf. J. F. B. van Hasselt, 

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37. P. Karrer and T. Takahashi, Helv. chim. Acta 16 (1933) 287. 



38. P. Herzig and F. Faltis, Ann. 431 (1923) 60. . 



39. J. F. B. van Hasselt, Rec. Trav. chim. Pays-Bas 30 (1911) n. 



40. A. Heiduschka and H. Riffart, Arch. Pharm. 24^ (1911) 47. 



41. P. Karrer and co-workers, Helv. chim. Acta 12 (1929) 752. — Cf. J. F. B. van Hasselt, 

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42. P. Karrer and co-workers, Helv. chim. Acta 12 (1929) 746, 754. — Cf. P. Karrer 

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43. J. Herzig and F. Faltis, Ann. 431 (1923) 51. 



44. P. Karrer and F. Benz, Helv. chim. Acta 16 (1933) 337- 



45. R. Kuhn and L. Ehmann, Helv. chim. Acta 12 (1929) 905. 



46. J. Herzig and F. Faltis, Ann. 431 {1923) 51. 



47. P. Karrer and co-workers, Helv. chim. Acta 15 (1932) 1409. 



48. P. Karrer and co-workers, Helv. chim. Acta 15 (1932) 1410. 



49. P. Karrer and co-workers, Helv. chim. Acta 15 (1932) 1411. 



50. H. Raudnitz and J. Peschel, Ber. 66 (1933) 901. 



