Energy Reaction Pathway Research Articles

Energy storage and reaction pathways in the first step of the vision process

Energy storage and reaction pathways in the first step of the vision process

ChemInform Abstract: DIASTEREOMERIC TRANSITION STATES. HIGH AND LOW ENERGY REACTION PATHWAYS IN THE COPE REARRANGEMENT

Chemischer InformationsdienstVolume 9, Issue 18 Preparative Organic Chemistry ChemInform Abstract: DIASTEREOMERIC TRANSITION STATES. HIGH AND LOW ENERGY REACTION PATHWAYS IN THE COPE REARRANGEMENT K. J. SHEA, K. J. SHEASearch for more papers by this authorR. B. PHILLIPS, R. B. PHILLIPSSearch for more papers by this author K. J. SHEA, K. J. SHEASearch for more papers by this authorR. B. PHILLIPS, R. B. PHILLIPSSearch for more papers by this author First published: May 2, 1978 https://doi.org/10.1002/chin.197818092AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume9, Issue18May 2, 1978 RelatedInformation

Additions and Corrections - Diastereomeric Transition States. High and Low Energy Reaction Pathways in the Cope Rearrangement.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdditions and Corrections - Diastereomeric Transition States. High and Low Energy Reaction Pathways in the Cope Rearrangement.Kenneth Shea and Richard PhillipsCite this: J. Am. Chem. Soc. 1978, 100, 9, 2936Publication Date (Print):April 1, 1978Publication History Published online12 February 2004Published inissue 1 April 1978https://doi.org/10.1021/ja00477a608RIGHTS & PERMISSIONSArticle Views23Altmetric-Citations-LEARN 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 InReddit PDF (155 KB) Get e-Alerts Get e-Alerts

Diastereomeric transition states. High and low energy reaction pathways in the Cope rearrangement

Diastereomeric transition states. High and low energy reaction pathways in the Cope rearrangement

Reaction of singlet methylene with methylenecyclopropane. Part 2.—High energy reaction pathways for chemically activated insertion products

The reaction of singlet methylene, formed by the photolysis of keten (λ≃ 313 nm) with methylenecyclopropane has been investigated over the pressure range, 1–300 Torr, but predominantly at the lower end. The products are ethylene, propylene, acetylene, allene, spiropentane, methylenecyclobutane, methylmethylenecyclopropane (MMCP), ethylidenecyclopropane (ECP), isoprene and various penta-1,2-, penta-1,3- and penta-1,4-dienes. Studies of the pressure dependences of acetylene, isoprene and the pentadienes indicate that they originate from the chemically activated insertion products MMCP and ECP. Detailed consideration of the pressure dependences of the acetylene and isoprene yields in conjunction with RRKM calculations, provides support for multistep collisional deactivation in this system. A stepladder model with a deactivation step size of ≃ 7.2 kcal mol–1 fits the data.Further RRKM calculations are used together with this model to provide approximate values for the critical energies of the pentadiene forming pathways.