86101-66-8Relevant academic research and scientific papers
Selected Transformations of 6-Cyclopropylidene-5-oxaspirohexan-4-one, a Highly Strained Tricyclic β-Lactone
Wulferding, Andreas,Jankowski, Joerg H.,Hoffmann, H. Martin R.
, p. 1275 - 1282 (2007/10/02)
The title lactone 2 acylates a variety of amines including phenylalanine, sterically hindered alcohols, and phenols.With activated non-enolizable carbonyl compounds, bis-spiro 6-membered β-keto lactones are formed. Oxidative rearrangement of 2 affords bis
Dimerization of Cyclopropanecarboxylic Acid Dianion and Thermal Decarboxylative Rearrangement of the Dimer to 2-Cyclopropyl-4,5-dihydrofuran
Jahngen, Edwin G. E.,Phillips, Douglas,Kobelski, Robert J.,Demko, Donald M.
, p. 2472 - 2476 (2007/10/02)
The dianion of cyclopropanecarboxylic acid (2) reacted with alkyl halides and deuterated water at temperatures below 0 deg C; however, self-condensation to the β-keto acid 3 was the only observed product at elevated temperatures.This observation contrasts the self-condensation of the ethyl ester where a trimeric diester alcohol is the product.Attempted mixed condensations of the dianion 2 and carboxylic acids without acidic α-protons did not proceed as well, 3 being the major product.Thermal decarboxylation of 3 did not yield the expected dicyclopropyl ketone; rather , a facile rearrangement in a sealed tube at 120 deg C occured, giving rise to 2-cyclopropyl-4,5-dihydrofuran.This "vinyl-cyclopropyl" type rearrangement does not occur through dicyclopropyl ketone or its enolate.
