G. Kumaran, Gurunath H. Kulkarni. Effect of the α-Alkyl Substituent of Conjugated Nitroolefins on the Formation of Cyclic Nitronic Esters vs. Nitrocyclopropanes in Their Reaction With Sulfur Ylides. Synthesis, 1995, 1545-1548.
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http://dx.doi.org/10.1055/s-1995-4137