References
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- Wislicenus , W. and Kötzle , A. 1889 . Ann. , 252 : 75 For the preparation of 2, cf.
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- Speer , J. H. and Babovich , T. C. Organic Synthesis, Collective , 3 39 For the preparation of 6, cf.
- Michaelis , A. and Gleichmann , L. 1882 . Chem. Ber. , 15 : 801