The cyclic alkynes 5-cyclononynone (23) and 5-cyclodecynone (24) were dimerized by heating with CpCo(CO)2 to form the tricyclic CpCo-stabilized cyclopentadienone derivatives 25 and 26, respectively. These diketones were transformed to the tricyclic diynes 30, 31, and 33, via the corresponding bis(selenadiazoles). Whereas the diynes 30 and 31 did not yield the desired bis(cyclopentadienono)phanes, we
Carbocyclic ring expansion reactions via radical chain processes. Part II.
作者:Jack E. Baldwin、Robert M. Adlington、Jeremy Robertson
DOI:10.1016/s0040-4020(01)82331-0
日期:1991.8
The further exploitation of the homolytic ringexpansionreaction of cyclohexanone derivatives is described. The application of this methodology to the preparation of exomethylene cycloalkanones, α-alkylated cyclodecanones, indanones, and decalinols is described.
Transannular Cyclizations of Medium-Sized Cycloalkynes and Cycloalkynones Induced by Electro- and Photochemically Generated NO3 Radicals
作者:Uta Wille、Christian Plath
DOI:10.1002/jlac.199719970117
日期:1997.1
Transannular radical cyclizations of medium-sized cycloalkynes and cycloalkynones induced by addition of NO3 radicals to the C–C triple bond were studied. In the reaction of NO3 with medium-sized cycloalkynes oxidation of the triple bond to a carbonyl group occurred and formation of cis-fused bicyclic alkanones by transannularcyclization was observed. In the reaction of NO3 radicals with medium-sized
Sulfate Radical Anions (SO<sub>4</sub><sup>•</sup><sup>-</sup>) as Donor of Atomic Oxygen in Anionic Transannular, Self-Terminating, Oxidative Radical Cyclizations
作者:Uta Wille
DOI:10.1021/ol006527y
日期:2000.11.1
anionic, transannular, self-terminating, oxidativeradical cyclization in the reactions with the ten-membered cycloalkyne 1 and the cycloalkynone 7, yielding the bicyclic ketones 5 and 6 or the alpha,beta-epoxy ketones 8 and 9, respectively. In these reactions SO(4)(*)(-) acts as an oxygen transfer reagent and can thus be considered as a donor of atomicoxygen in solution.
Self-terminating, oxidative radical cyclizations of medium-sized cycloalkynones with inorganic and organic oxygen-centered radicals of type XO˙: the reaction pathway depends on the nature of X
作者:Uta Wille、Christian Jargstorff
DOI:10.1039/b201672a
日期:2002.4.9
The reaction of various inorganic and organic oxygen-centered radicals of type XO˙ with cyclodec-5-ynone 6 can be used as a mechanistic probe to study the ease with which X˙ acts as a leaving group in self-terminating, oxidative radical cyclizations. It was observed that when X˙ has good leaving ability the reaction leads to formation of the bicyclic epoxy ketones 13 and 14, whereas in the other cases