Number | Name | Date | Kind |
---|---|---|---|
3794636 | Girgis | Feb 1974 | |
5045554 | Alt et al. | Sep 1991 |
Number | Date | Country |
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0276177 | Jul 1988 | EPX |
Entry |
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Liebscher et al. "Ring Transformation via Bridged 1,3-Dicarbonyl Heteroanalogs Part II." Synthesis, Dec. 1989, pp. 968-970. |