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Statements

Subject Item
n2:RIV%2F61388963%3A_____%2F13%3A00391515%21RIV14-MSM-61388963
rdf:type
n3:Vysledek skos:Concept
dcterms:description
The enantioselective intramolecular [2 + 2 + 2] cycloisomerisation of triynes under catalysis by chiral transition-metal complexes (Co-I, Ni-0) in order to receive nonracemic helicene derivatives was explored. The use of the chiral neomenthylindene Co-I complex led to a moderate 25% ee of tetrahydro[6] helicene, which was the first example of such a reaction catalysed by the chiral Co-I complex. The alternative Ni-0 catalysis employing privileged axially chiral monophosphines such as (-)-(aS)-NAPHEP led to tetrahydro [6] helicene with 64% ee, which is among the highest enantiomeric excesses so far observed for this Ni-0-catalysed reaction. The enantioselective intramolecular [2 + 2 + 2] cycloisomerisation of triynes under catalysis by chiral transition-metal complexes (Co-I, Ni-0) in order to receive nonracemic helicene derivatives was explored. The use of the chiral neomenthylindene Co-I complex led to a moderate 25% ee of tetrahydro[6] helicene, which was the first example of such a reaction catalysed by the chiral Co-I complex. The alternative Ni-0 catalysis employing privileged axially chiral monophosphines such as (-)-(aS)-NAPHEP led to tetrahydro [6] helicene with 64% ee, which is among the highest enantiomeric excesses so far observed for this Ni-0-catalysed reaction.
dcterms:title
Chiral cobalt(I) and nickel(0) complexes in the synthesis of nonracemic helicenes through the enantioselective [2+2+2] cyclotrimerisation of alkynes Chiral cobalt(I) and nickel(0) complexes in the synthesis of nonracemic helicenes through the enantioselective [2+2+2] cyclotrimerisation of alkynes
skos:prefLabel
Chiral cobalt(I) and nickel(0) complexes in the synthesis of nonracemic helicenes through the enantioselective [2+2+2] cyclotrimerisation of alkynes Chiral cobalt(I) and nickel(0) complexes in the synthesis of nonracemic helicenes through the enantioselective [2+2+2] cyclotrimerisation of alkynes
skos:notation
RIV/61388963:_____/13:00391515!RIV14-MSM-61388963
n3:predkladatel
n19:ico%3A61388963
n4:aktivita
n15:I n15:P
n4:aktivity
I, P(IAA400550916), P(LC512)
n4:cisloPeriodika
Jan 1
n4:dodaniDat
n10:2014
n4:domaciTvurceVysledku
n11:4128575 n11:7626924 n11:8624526
n4:druhVysledku
n12:J
n4:duvernostUdaju
n9:S
n4:entitaPredkladatele
n14:predkladatel
n4:idSjednocenehoVysledku
65286
n4:idVysledku
RIV/61388963:_____/13:00391515
n4:jazykVysledku
n16:eng
n4:klicovaSlova
asymmetric catalysis; helicene; cycloisomerisation; alkyne
n4:klicoveSlovo
n6:asymmetric%20catalysis n6:alkyne n6:cycloisomerisation n6:helicene
n4:kodStatuVydavatele
CH - Švýcarská konfederace
n4:kontrolniKodProRIV
[CBE0DB50228B]
n4:nazevZdroje
Journal of Organometallic Chemistry
n4:obor
n18:CC
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
6
n4:projekt
n5:LC512 n5:IAA400550916
n4:rokUplatneniVysledku
n10:2013
n4:svazekPeriodika
723
n4:tvurceVysledku
Andronova, Angelina Hapke, M. Heller, B. Fischer, C. Starý, Ivo Stará, Irena G.
n4:wos
000311680100014
s:issn
0022-328X
s:numberOfPages
5
n17:doi
10.1016/j.jorganchem.2012.07.005