Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Pieter S. van Heerden"'
Autor:
Leon D. van Rensburg, Rianto van Antwerpen, Tshifhiwa Radzilani, Alex Searle, Pieter S. van Heerden, Marius Adendorff, Ashiel Jumman
Publikováno v:
Irrigation and Drainage. 71:381-393
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1e2849c7393cd1752cf23d60921543f7
https://doi.org/10.1002/ird.2655
https://doi.org/10.1002/ird.2655
Publikováno v:
Fuel Processing Technology. 94:75-79
gem -Disubstituted alkenes are directly and readily etherified with alcohols using Al(OTf) 3 and Zr(OTf) 4 as recyclable Lewis acid catalysts. In contrast, primary or secondary alkene analogues were inert under these conditions, enabling excellent ch
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b6675fa8fe67752eb9692426c28f6fa8
https://doi.org/10.1016/j.fuproc.2011.10.024
https://doi.org/10.1016/j.fuproc.2011.10.024
Publikováno v:
Catalysis Letters. 141:958-967
The evaluation of supported precious metal catalysts, in combination with and without solid acids, for the hydrogenolysis of highly concentrated glycerol solutions, with the aim to produce lower alcohols, in particular 1-propanol was studied. GCMS an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1faefedc64e029f34d6e56131a82e60f
https://doi.org/10.1007/s10562-011-0617-z
https://doi.org/10.1007/s10562-011-0617-z
Autor:
Pieter S. van Heerden, D. Bradley G. Williams, Mike S. Sibiya, Megan M. Kirk, Roger A. Harris
Publikováno v:
Journal of Molecular Catalysis A: Chemical. 304:147-152
The co-generation of dimethyl carbonate (potential fuels additive, environmentally friendly replacement for more toxic methylating agents, etc.) and propylene glycol via the transesterification reaction of propylene carbonate and methanol was studied
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9cc207149aa842e404fd0e810709954
https://doi.org/10.1016/j.molcata.2009.02.005
https://doi.org/10.1016/j.molcata.2009.02.005
Publikováno v:
Tetrahedron Letters. 51:57-59
Rearrangement of the decalin system of pravastatin under SN2′ Mitsunobu conditions and subsequent selective hydrolysis and oxidation afforded a key dienone 23, which upon copper-catalyzed addition of a 1E-propenyl moiety established the carbon fram
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::276019eab7e72808f051b4ed4232e7c3
https://doi.org/10.1016/j.tetlet.2009.10.080
https://doi.org/10.1016/j.tetlet.2009.10.080
Autor:
Hendrik van Rensburg, Reinier J. J. Nel, Pieter S. van Heerden, Johan Coetzee, Daneel Ferreira
Publikováno v:
Tetrahedron. 55:9727-9736
Epoxidation of a series of poly-oxygenated chalcones with urea-hydrogen peroxide complex in THF in the presence of DBU and poly-( l )- or -( d )-leucine, followed by TBTH/AIBN catalysed ring opening, afforded β-hydroxydihydrochalcones in moderate to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3930a71aaa20efdd7430b94e0645b25
https://doi.org/10.1016/s0040-4020(99)00554-2
https://doi.org/10.1016/s0040-4020(99)00554-2
Autor:
Mark B. Rohwer, E. Vincent Brandt, Pieter S. van Heerden, Daneel Ferreira, Barend C. B. Bezuidenhoudt
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 1. :3367-3374
A protocol of introducing an electrophilic C1 fragment to a pterocarpan nucleus, followed by anionic coupling of a C6–C2 benzofuranoid precursor and late introduction of the final C6 fragment, permitted the syntheses of daljanelins B 3 and D 5. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90e580027f14a98e3860ba4a18cb9837
https://doi.org/10.1039/a904944d
https://doi.org/10.1039/a904944d
Publikováno v:
Tetrahedron Letters. 39:5623-5626
Epoxidation of a series of poly-oxygenated chalcones with urea-hydrogen peroxide complex in THF in the presence of DBU and poly-( l )- or -( d )-leucine, followed by TBTH/AIBN catalysed ringopening, afforded β-hydroxydihydrochalcones in moderate to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::33444033250a90bdeabb3e6595a41754
https://doi.org/10.1016/s0040-4039(98)01064-8
https://doi.org/10.1016/s0040-4039(98)01064-8
Publikováno v:
Tetrahedron. 53:14141-14152
Epoxidation of a series of poly-oxygenated chalcones with H2O2 in the presence of poly-α-aminoacids yielded chiral aromatic oxygenated oxiranes in moderate to high optical yields. Lewis acid-catalysed phenylmethanethiol ringopening of the epoxide fu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b11abc14c6769130af90837764fb7a9
https://doi.org/10.1016/s0040-4020(97)00916-2
https://doi.org/10.1016/s0040-4020(97)00916-2
Publikováno v:
Tetrahedron Letters. 38:3089-3092
Asymmetric dihidroxylation of (E)-1-(3,4-dimethoxyphenyl)-3-(2-methoxy-methyl-4,6-dimethoxy-phenyl)-propene with AD-mix-α or AD-mix-β in the presence of methanesulfonamide, followed by acid catalysed cyclization, afforded the four catechin diastere
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1938e09a6139de0ce5c1ef31a1224f6b
https://doi.org/10.1016/s0040-4039(97)00552-2
https://doi.org/10.1016/s0040-4039(97)00552-2