28860-75-5Relevant academic research and scientific papers
Catalytic cyclopropanation with transition metal salts of soluble polyethylene carboxylates
Bergbreiter, David E.,Morvant, Mark,Chen, Bushi
, p. 2731 - 2734 (1991)
Syntheses of Rh(II) carboxylate salts of terminally funcfionalized polyethylene carboxylic acids arc described. These polymer-bound transition metals are homogeneous catalysts for cyclopropanation of alkenes at 100°C and have activities and selectivities like transition metal acetates but are quantitatively recoverable at 25°C.
Deamination Reactions, 37. Decomposition of Bicyclononane- and Bicyclonon-2-ene-9-diazonium Ions
Kirmse, Wolfgang,Hellwig, Georg
, p. 2744 - 2754 (2007/10/02)
Bicyclononane-exo-9-diazonium ions (9) have been generated from the corresponding nitrosourea (8) and base.In weakly alkaline solution (E)-3-methoxycyclononene (11) was formed by disrotatory ring opening of (9).In the presence of sodium methoxide 1,2-cyclononadiene (13) and exo-9-methoxybicyclononane (15) were additional products, presumably arising via carbene 12.Bicyclonon-2-ene-exo-9-diazonium ions (21) decomposed without participation of the double bond to give the (Z,E)-methoxycyclononadienes 22 and 23.The 21-derived carbene 29 afforded the bicyclic ether 30 and the elusive 1,2,4-cyclononatriene (32).In contrast to its lower homologs, 29 did not undergo a carbene-carbene rearrangement (29 -> 31).
Thermal valence isomerization of cis-fused bicyclic cyclobutenes. A study of orbital symmetry control
Dauben, William G.,Michno, Drake M.
, p. 2284 - 2292 (2007/10/19)
This study shows that thermally promoted valence isomerizations of cis-fused bicyclic cyclobutenes, when free of steric constraint, yield products arising from both orbital symmetry allowed conrotatory openings of the labile σ bond in the cyclobutene ring. In the case of the related vinylcyclobutenes, one conrotatory mode produces a stable cis,trans,cis monocyclic triene whereas fission in the other allowed sense affords a thermally labile trans,cis,cis monocyclic triene which, in turn, cyclizes to yield a cyclohexadiene derivative. The product distributions are evaluated in terms of secondary orbital interactions.
