Pauson–Khand Reactions in a Photochemical Flow Microreactor
摘要:
Pauson-Khand reactions were achieved at ambient temperature without any additive using a photochemical flow microreactor. The efficiency of the reaction was better than that in a conventional batch reactor, and the reaction could be operated continuously for 1 h.
Advances in the cobalt-catalysed Pauson-Khand reaction: Development of a sulfide-promoted, microwave-assisted protocol
作者:Alison R. Cochrane、William J. Kerr、Laura C. Paterson、Colin M. Pearson、Paul Shaw
DOI:10.1016/j.tet.2020.131805
日期:2021.1
sulfide-promoted, microwave-assisted Pauson-Khandreaction has enabled the formation of fused cyclopentenones using sub-stoichiometric quantities of a cobalt mediator over rapid reaction times and with no requirement for an external source of toxic carbon monoxide gas. This protocol displays applicability to both intra- and intermolecular Pauson-Khandreaction examples.
A sub-stoichiometric version of the Pauson-Khand reaction
作者:Thotapally Rajesh、Mariappan Periasamy
DOI:10.1016/s0040-4039(98)02461-7
日期:1999.1
A new protocol for the Pauson-Khandreaction using alkyneCo2(CO)6 complexes prepared from sub-stoichiometric amounts of CoBr2 and Zn at atmospheric pressure of carbon monoxide is described.
Use of fused ring cyclopentanones and cyclopentenones in controlling plant growth
申请人:The University of Strathclyde
公开号:US06174840B1
公开(公告)日:2001-01-16
Use in inhibiting plant growth of a compound of formula II
in which either the pair of symbols X and Y or the pair of symbols Y and Z, together with the carbon atoms to which they are attached, form a non-aromatic ring system having either 5 or 7 ring atoms, all of which are carbon except that one may be oxygen, and which is substituted or unsubstituted, R1 represents a hydrogen atom or an alkyl, alkenyl or a substituted or unsubstituted phenyl group and R2 represents a hydrogen atom and R3 an alkyl carboxyalkyl group or R2 and R3 together form a double bond, and thereafter any unsatisfied valencies of ring carbon atoms of the ring shown in formula II are satisfied by hydrogen atoms.
Alkyne-dicobalthexacarbonyl complexes are readily prepared by the reduction of cobalt bromide by Zn in the presence of alkynes in THF while bubbling carbon monoxide under ambient conditions. The complexes prepared in this way react with olefins to give the corresponding Pauson-Khand cyclopentenones in moderate to good yields. The alkyne-dicobalthexacarbonyl complexes can be also prepared in situ by