Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Petrus J. Steynberg"'
Publikováno v:
Organometallics. 26:1000-1013
The successful [Ph2PN(iPr)PPh2]Cr-catalyzed trimerization and tetramerization of ethylene to 1-hexene and 1-octene requires the presence of a cocatalyst, of which methylaluminoxane (MAO) is particu...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e8016e08137ea16dc49fa2e64d228997
https://doi.org/10.1021/om060890c
https://doi.org/10.1021/om060890c
Autor:
Grant S. Forman, Petrus J. Steynberg, Wolfgang H. Meyer, Werner Janse van Rensburg, Megan M. Kirk
Publikováno v:
Journal of Organometallic Chemistry. 691:5312-5325
The reaction mechanism and substrate-induced decomposition behavior of three ruthenium olefin metathesis catalysts, viz. first- and second-generation catalysts and the recently developed Phoban catalyst (“Phobcat”) are compared by constructing Δ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ea70c3421060240277cb8e6b3bad772
https://doi.org/10.1016/j.jorganchem.2006.08.075
https://doi.org/10.1016/j.jorganchem.2006.08.075
Autor:
Johan J. Huyser, Cronjé Grove, Jan P. Steynberg, Klaus B. Stark, Werner Janse Van Rensburg, Petrus J. Steynberg
Publikováno v:
Organometallics. 23:1207-1222
A theoretical study of a mechanism for ethylene trimerization, catalyzed by Cr-pyrrolyl complexes, is proposed and investigated with density functional theory methods. The selective formation of 1-hexene is generally accepted to follow a metallacycle
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f2f77663b3c8471c3600cf97edd9088
https://doi.org/10.1021/om0306269
https://doi.org/10.1021/om0306269
Autor:
Werner Janse van Rensburg, Chantelle Crause, Llewellyn Damoense, Cronje Grove, Linette Bennie, Konrad Mokheseng, Petrus J. Steynberg, Catherine L. Dwyer, Megan M. Kirk, Stefanus Otto, Neil Grimmer
Publikováno v:
Dalton Trans.. :2036-2042
A range of tertiary phosphine ligands derived from (R)-(+)-limonene was studied by HP-31P NMR, HP-IR, batch autoclave reactions and molecular modelling during the hydroformylation of 1-dodecene using a cobalt catalyst system and a metal ∶ ligand ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::448f2f629b68732e5af1476d7d14888e
https://doi.org/10.1039/b210650g
https://doi.org/10.1039/b210650g
Autor:
Petrus J. Steynberg, Daneel Ferreira, Hendrik van Rensburg, Reinier J. J. Nel, Barend C. B. Bezuidenhoudt
Publikováno v:
Tetrahedron. 54:8153-8158
Dimethyl(methylthio)sulfonium tetrafluoroborate (DMTSF) and silver tetrafluoroborate (AgBF 4 ) activate the C 4 S bond in the 4-thioethers of flavan-3-ols toward carbon nucleophiles to permit formation of the interflavanyl bond in procyanidins und
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2fe91b36ecd372a034e0614aa05b7749
https://doi.org/10.1016/s0040-4020(98)00454-2
https://doi.org/10.1016/s0040-4020(98)00454-2
Autor:
Barend C. B. Bezuidenhoudt, Petrus J. Steynberg, E. Vincent Brandt, Daneel Ferreira, Jan P. Steynberg, Annemarie Cronjé
Publikováno v:
Tetrahedron. 53:2591-2598
The hepta-O-methyl ethers 3 and 4 of procyanidin A-1 1 and A-2 2 are subject to facile cleavage of the acetal functionality with sodium cyanoboranuide in trifluoroacetic acid at 0°C. This straight forward chemical method permits the unambiguous esta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dc7789886150efbba9764de6daef5634
https://doi.org/10.1016/s0040-4020(96)01149-0
https://doi.org/10.1016/s0040-4020(96)01149-0
Autor:
Daneel Ferreira, Jan P. Steynberg, Richard W. Hemingway, Petrus J. Steynberg, E. Vincent Brandt
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 1. :1943-1950
The natural occurrence of the first oligomeric profisetinidins with (2R,3R)-2,3-cis-epifisetinidol chain extender units is demonstrated in the bark of Pithecellobium dulce (Guamuchil). Semi-synthesis using the appropriate flavan-3-ol and flavan-3,4-d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::454563a5ec19b6e5aaeb987efa47feb9
https://doi.org/10.1039/a701334e
https://doi.org/10.1039/a701334e
Autor:
Richard W. Hemingway, Petrus J. Steynberg, G. Wayne McGraw, Daneel Ferreira, Jan P. Steynberg
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 1. :2395-2404
Acetic acid-catalyzed cleavage of proanthocyanidins in the presence of phloroglucinol gives a series of 2R procyanidin- and prodelphinidin-phloroglucinol adducts together with a novel 2S all-cis derivative implicating cleavage of the pyran ring and s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6533b324dde396c19e326055f967f3ee
https://doi.org/10.1039/a700889i
https://doi.org/10.1039/a700889i
Publikováno v:
Phytochemistry. 41:1209-1213
An acetone extract of the bark of Cassia abbreviata yielded guibourtinidol-(4β → 8)-epicfzelechin, guibourtinidol-(4α → 8)-epiafzelechin, guibourtinidol-(4α → 8)-catechin, guibourtinidol-(4β → 8)-epicatechin and ent-guibourtinidol-(4β
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::67835cf8e857af77e39a5bb6b94a3c28
https://doi.org/10.1016/0031-9422(95)00656-7
https://doi.org/10.1016/0031-9422(95)00656-7
Publikováno v:
Tetrahedron. 51:2339-2352
The range of naturally occurring prorobinetinidins is extended by characterization of the novel robinetinidol-leucorobinetinidins 3, 5, 7, and 9, the robinetinidol-dihydrorobinetins 11, 13, and 15, a robinetinidol-robinetin 17, and a robinetinidol-fl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7471eba4e9461d72f8855ee551fee3a6
https://doi.org/10.1016/0040-4020(94)01091-d
https://doi.org/10.1016/0040-4020(94)01091-d