Zobrazeno 1 - 10
of 96
pro vyhledávání: '"Roger C. Helgeson"'
Autor:
Anna Camus, Donald Hilvert, Takahiro Mori, Yike Zou, Roger C. Helgeson, H. Adrian Bunzel, Gonzalo Jiménez-Osés, Sophie Basler, Sabine Studer, Yusuke Ota, K. N. Houk
Publikováno v:
Nature Chemistry. 13:231-235
New enzyme catalysts are usually engineered by repurposing the active sites of natural proteins. Here we show that design and directed evolution can be used to transform a non-natural, functionally naive zinc-binding protein into a highly active cata
Autor:
F. Matthias Bickelhaupt, Kendall N. Houk, Roger C. Helgeson, Trevor A. Hamlin, Brian J. Levandowski
Publikováno v:
Journal of Organic Chemistry, 83, 3164-3170
Journal of Organic Chemistry, 83, 6, pp. 3164-3170
Levandowski, B J, Hamlin, T A, Helgeson, R C, Bickelhaupt, F M & Houk, K N 2018, ' Origins of the Endo and Exo Selectivities in Cyclopropenone, Iminocyclopropene, and Triafulvene Diels-Alder Cycloadditions ', Journal of Organic Chemistry, vol. 83, no. 6, pp. 3164-3170 . https://doi.org/10.1021/acs.joc.8b00025
Journal of Organic Chemistry, 83(6), 3164-3170. American Chemical Society
The Journal of organic chemistry, vol 83, iss 6
Journal of Organic Chemistry, 83, 6, pp. 3164-3170
Levandowski, B J, Hamlin, T A, Helgeson, R C, Bickelhaupt, F M & Houk, K N 2018, ' Origins of the Endo and Exo Selectivities in Cyclopropenone, Iminocyclopropene, and Triafulvene Diels-Alder Cycloadditions ', Journal of Organic Chemistry, vol. 83, no. 6, pp. 3164-3170 . https://doi.org/10.1021/acs.joc.8b00025
Journal of Organic Chemistry, 83(6), 3164-3170. American Chemical Society
The Journal of organic chemistry, vol 83, iss 6
The endo and exo stereoselectivities of Diels-Alder reactions of cyclopropenone, iminocyclopropene, and substituted triafulvenes with butadiene were rationalized using density functional theory calculations. When cyclopropenone is the dienophile, the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8bb85207aa576f2d936af342754553cd
http://hdl.handle.net/2066/190326
http://hdl.handle.net/2066/190326
Publikováno v:
Angewandte Chemie International Edition. 52:655-659
Guests in a gated community: introduction of two anthracene groups into a linker in a hemicarcerand creates a new type of photochemically controlled gated hemicarcerand. The reversible opening and closing of the "gate" of the host is controlled photo
Autor:
Sean Thomas Roberts, Benjamin J. Schwartz, Clifton Kwang F.U. Shen, Roger C. Helgeson, Alexander Smith
Publikováno v:
Research on Chemical Intermediates. 33:125-142
In this paper, we investigate the photophysical properties of the conjugated poly electrolyte poly(2-methoxy-5-propyloxy sulfonate phenylene vinylene) (MPS-PPV), dissolved in both water and DMSO as a function of the solution ionic strength. Dynamic l
Publikováno v:
Molecular Crystals and Liquid Crystals. 456:175-192
The design, syntheses and binding capabilities of two novel cavitand-based receptors are described. Receptor 1, contains a cyclic array of pyridine moieties in its appendages and was synthesized in a single step from the known tetrol: refluxing tetro
Publikováno v:
ChemInform. 45
CONSPECTUS: Donald Cram's pioneering Nobel Prize-winning work on host-guest molecules led eventually to his creation of the field of container molecules. Cram defined two types of container molecules: carcerands and hemicarcerands. Host-guest complex
Publikováno v:
IEEE Journal of Quantum Electronics. 39:1003-1008
We report the observation of one-, two-, and three-photon pumped lasing in the same medium, a novel liquid dye salt system when excited by pulsed 0.532-, 1.06-, and /spl sim/1.49-/spl mu/m coherent radiation pulses, respectively. Since the gain mediu
Autor:
Christian Kloc, Cheng Hsuan Chen, Gregory W. Mitchell, Fred Wudl, Zhenan Bao, Michael Bendikov, Theo Siegrist, Hong Meng, Roger C. Helgeson
Publikováno v:
Advanced Materials. 15:1090-1093
Autor:
Yongsheng Chen, Fred Wudl, Bruce Dunn, Derald Tucker, Hong Meng, Roger C. Helgeson, Sterling Chaffins
Publikováno v:
Advanced Materials. 15:146-149
Publikováno v:
Accounts of Chemical Research
CONSPECTUS: Donald Cram's pioneering Nobel Prize-winning work on host-guest molecules led eventually to his creation of the field of container molecules. Cram defined two types of container molecules: carcerands and hemicarcerands. Host-guest complex