The intermediacy of oxycyclobutenes in the synthesis and reactions of cyclobutenones and cyclobutenols
作者:Aryeh A Frimer、Hillel Pizem
DOI:10.1016/s0040-4020(99)00695-x
日期:1999.10
of the isopropyl ylide to cyclobutenone 4; in a normal addition of ketone to ylide, vinylallene 12 is also obtained. Finally, the corresponding Wittig reaction of 4,4-dichlorocyclobutenone 3 yields only the 2,4-dichloro isomer 13. When this reaction is carried in the presence of n-butoxide, dienone 32 is generated.
Small-Ring Compounds. XIII. The Mechanism of Racemization of Optically Active 2,4-Dichloro-3-phenylcyclobutenone<sup>1</sup>
作者:Erwin F. Jenny、John D. Roberts
DOI:10.1021/ja01590a068
日期:1956.5
Racemization of opticallyactive 2,4-dichloro-3-phenylcyclobutenone has been shown to involve reversible formation of (1-phenyl-2-chloroethenyl)-chloroketene 2,4-dichloro-3-phenyl-3-butenoic acid yields 2,4-dichloro-3-phenylcyclobutenone on treatment with acetic anhydride.
Small-Ring Compounds. XVI. The Structure of the Carboxylic Acid from Ring Opening of 2,4-Dichloro-3-phenylcyclobutenone<sup>1</sup>
作者:Ernest F. Silversmith、John D. Roberts
DOI:10.1021/ja01597a041
日期:1956.8
The structure 2,4-dichloro-3-phenyl-3-hutenoic acid (II) , previously proposed for the product of the base-induced ringopening of 2,4-dichloro-3-phenylcyclohutenone (I) is supported by nuclear magnetic resonance spectroscopy and demonstration of the presence of an asymmetric center by partial resolution.
2,4-二氯-3-苯基-3-胡烯酸 (II) 结构,先前提出用于 2,4-二氯-3-苯基环胡烯酮 (I) 的碱诱导开环产物,由核磁支持共振光谱和通过部分分辨率证明不对称中心的存在。
Stereochemical selectivities in the electrocyclic valence isomerizations of cyclobutenones and 2,4-cyclohexadienones
作者:John E. Baldwin、Mildred C. McDaniel
DOI:10.1021/ja01024a031
日期:1968.10
Schmidt,A.H. et al., Justus Liebigs Annalen der Chemie, 1976, p. 705 - 715