Publications

ADVERTISEMENT RETURN TO ISSUEPREVReviewNEXTC−H Activation for the Construction of C−B BondsIbraheem A. I. Mkhalid†‡, Jonathan H. Barnard†, Todd B. Marder*†, Jaclyn M. Murphy§¶, and John F. Hartwig*¶View Author Information Durham University, Department of Chemistry, South Road, Durham, DH1 3LE, United Kingdom; Department of Chemistry, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia; Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 61821; and the University of Illinois, Department of Chemistry, A410 Chemical Life, Science Lab, 600 S. Matthews Avenue, Urbana, Illinois 61801* To whom correspondence should be addressed.†Durham University.‡King Abdulaziz University.§Yale University.¶The University of Illinois.Cite this: Chem. Rev. 2010, 110, 2, 890–931Publication Date (Web):December 22, 2009Publication History Received25 May 2009Published online22 December 2009Published inissue 10 February 2010https://pubs.acs.org/doi/10.1021/cr900206phttps://doi.org/10.1021/cr900206preview-articleACS PublicationsCopyright © 2009 American Chemical SocietyRequest reuse permissionsArticle Views51432Altmetric-Citations2399LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose SUBJECTS:Aromatic compounds,Borylation,Catalysts,Hydrocarbons,Organic compounds Get e-Alerts

(abridged) We report our discovery and observations of the peculiar Type IIn\nsupernova SN2006gy in NGC1260, revealing that it reached a peak magnitude of\n-22, making it the most luminous supernova ever recorded. It is not yet clear\nwhat powers the total radiated energy of 1e51 erg, but we argue that any\nmechanism -- thermal emission, circumstellar interaction, or 56Ni decay --\nrequires a very massive progenitor star. The circumstellar interaction\nhypothesis would require truly exceptional conditions around the star probably\nexperienced an LBV eruption like the 19th century eruption of eta Carinae.\nAlternatively, radioactive decay of 56Ni may be a less objectionable\nhypothesis. That power source would imply a large Ni mass of 22 Msun, requiring\nthat SN2006gy was a pair-instability supernova where the star's core was\nobliterated. SN2006gy is the first supernova for which we have good reason to\nsuspect a pair-instability explosion. Based on a number of lines of evidence,\nwe rule out the hypothesis that SN 2006gy was a ``Type IIa'' event. Instead, we\npropose that the progenitor may have been a very massive evolved object like\neta Carinae that, contrary to expectations, failed to completely shed its\nmassive hydrogen envelope before it died. Our interpretation of SN2006gy\nimplies that the most massive stars can explode earlier than expected, during\nthe LBV phase, preventing them from ever becoming Wolf-Rayet stars. SN2006gy\nalso suggests that the most massive stars can create brilliant supernovae\ninstead of dying ignominious deaths through direct collapse to a black hole.\n

Abstract not Available.

We present the highest resolution images to date of caustics formed by wave dark matter ($ψ$DM) fluctuations near the critical curves of cluster gravitational lenses. We describe the basic magnification features of $ψ$DM in the source plane at high macromodel magnification and discuss specific differences between the $ψ$DM and standard cold dark matter (CDM) models. The unique generation of demagnified counterimages formed outside the Einstein radius for $ψ$DM is highlighted. Substructure in CDM cannot generate such demagnified images of positive parity, thus providing a definitive way to distinguish $ψ$DM from CDM. Highly magnified background sources with sizes $r\approx 1pc$, or approximately a factor of ten smaller than the expected de Broglie wavelength of $ψ$DM, offer the best possibility of discriminating between $ψ$DM and CDM. These include objects such as very compact stellar clusters at high redshift that JWST is finding in abundance.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.