References
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- The u. v. data shows this material to be a mixture of cis and trans isomers; λmax 248 nm (cis) and λmax 292 nm (trans). After recrystallization, the cis-trans ratio was determined, by glpc. to be 1:3. Repeated recrystallizatians eventually leads to the pure trans isomer, mp 55°
- Woodward , R. B. , Rosenblum , M. and Whitney , M. C. 1958 . J. Amer. Chem. Soc. , 80 : 5443
- Wittig , 6. and Schollkopg , U. 1954 . Chem. Ber. , 87 : 1318