42955-18-0Relevant articles and documents
New Results on the Stereoselectivity of Ketoketene Dimerizations
Dehmlow, Eckehard V.,Pickardt, Joachim,Slopianka, Marion,Fastabend, Uwe,Drechsler, Katharina,Soufi, Johanna
, p. 377 - 379 (2007/10/02)
Alkylation of 2,4-disubstituted 1,3-cyclobutanediones results in tetraalkylcyclobutanediones with trans-positioned large residues.Thermal dimerization of isopropylmethylketene gives cis-dimer 4a as major product, whereas methylneopentylketene yields more of the trans-isomer 5b.The results are discussed in connection with a ?2s+?2a> process.
