Number | Date | Country | Kind |
---|---|---|---|
3729226 | Sep 1987 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2237284 | Alquist et al. | Apr 1941 | |
2816059 | Mills | Dec 1957 | |
2887509 | Nash | May 1959 |
Number | Date | Country |
---|---|---|
252215 | Feb 1967 | ATX |
Entry |
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Wierenga et al, J. Org. Chem. 49 (1984), pp. 438-442. |
Chapman et al, J. Chem. Soc. (C) 1967, pp. 293-296. |