Either diastereomer of 2 or 10 is deoxygenated with BH3-THF/CF3CO2H to give mainly the trans product, 3b or 11b. The process involves a key enammonium-iminium rearrangement in which there is almost exclusive proton delivery from a single face.
ChemInformVolume 18, Issue 13 Physical Organic Chemistry ChemInform Abstract: Determination of Enantiomeric Purity of Tertiary Amines by 1H NMR of α-Methoxy-α-(trifluoromethyl)phenylacetic Acid Complexes. F. J. JUN. VILLANI, F. J. JUN. VILLANI Dep. Chem. Res., McNeil Pharm., Spring House, PA 19477-0776, USASearch for more papers by this authorM. J. COSTANZO, M. J. COSTANZO Dep. Chem. Res., McNeil Pharm., Spring House, PA 19477-0776, USASearch for more papers by this authorR. R. INNERS, R. R. INNERS Dep. Chem. Res., McNeil Pharm., Spring House, PA 19477-0776, USASearch for more papers by this authorM. S. MUTTER, M. S. MUTTER Dep. Chem. Res., McNeil Pharm., Spring House, PA 19477-0776, USASearch for more papers by this authorD. E. MCCLURE, D. E. MCCLURE Dep. Chem. Res., McNeil Pharm., Spring House, PA 19477-0776, USASearch for more papers by this author F. J. JUN. VILLANI, F. J. JUN. VILLANI Dep. Chem. Res., McNeil Pharm., Spring House, PA 19477-0776, USASearch for more papers by this authorM. J. COSTANZO, M. J. COSTANZO Dep. Chem. Res., McNeil Pharm., Spring House, PA 19477-0776, USASearch for more papers by this authorR. R. INNERS, R. R. INNERS Dep. Chem. Res., McNeil Pharm., Spring House, PA 19477-0776, USASearch for more papers by this authorM. S. MUTTER, M. S. MUTTER Dep. Chem. Res., McNeil Pharm., Spring House, PA 19477-0776, USASearch for more papers by this authorD. E. MCCLURE, D. E. MCCLURE Dep. Chem. Res., McNeil Pharm., Spring House, PA 19477-0776, USASearch for more papers by this author First published: March 31, 1987 https://doi.org/10.1002/chin.198713044AboutPDF 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. Volume18, Issue13March 31, 1987 RelatedInformation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of enantiomeric purity of tertiary amines by proton NMR of .alpha.-methoxy-.alpha.-(trifluoromethyl)phenylacetic acid complexesFrank J. Villani Jr., Michael J. Costanzo, Ruth R. Inners, Martin S. Mutter, and David E. McClureCite this: J. Org. Chem. 1986, 51, 19, 3715–3718Publication Date (Print):September 1, 1986Publication History Published online1 May 2002Published inissue 1 September 1986https://doi.org/10.1021/jo00369a034RIGHTS & PERMISSIONSArticle Views218Altmetric-Citations44LEARN 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 (570 KB) Get e-Alerts Get e-Alerts
AbstractThe stereochemistry of the Wittig reaction between (I) and (II) has been reevaluated by measuring the intermediate oxaphosphetanes (III) and (IV) by low temperature 31P‐NMR spectroscopy.
AbstractIndividual diastereoisomeric 1,2‐oxaphosphetanes such as (III) and (IV) have been directly observed in the Wittig olefination reaction by use of high‐field NMR spectroscopy at low temp., permitting detailed evaluation of these intermediates.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDramatic reversal of diastereoselectivity in an N-acyliminium ion cyclization leading to hexahydropyrrolo[2,1-a]isoquinolines. A case of competing steric interactionsBruce E. Maryanoff, David F. McComsey, Harold R. Almond Jr., Martin S. Mutter, Guy W. Bemis, Robert R. Whittle, and R. A. OlofsonCite this: J. Org. Chem. 1986, 51, 8, 1341–1346Publication Date (Print):April 1, 1986Publication History Published online1 May 2002Published inissue 1 April 1986https://pubs.acs.org/doi/10.1021/jo00358a034https://doi.org/10.1021/jo00358a034research-articleACS PublicationsRequest reuse permissionsArticle Views455Altmetric-Citations23LEARN 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-AlertscloseSupporting Info (1)»Supporting Information Supporting Information Get e-Alerts
AbstractEs wird gezeigt, daß Phenyliso(thio)cyanat (II) mit dem Amino‐thiazolin (I) unter kinetisch kontrollierten Bedingungen zu den Addukten (III) reagiert, die sich dann beim Erhitzen zu den thermodynamisch stabileren Isomeren (IV) umlagern.
Chemischer InformationsdienstVolume 17, Issue 42 Preparative Organic Chemistry ChemInform Abstract: Dramatic Reversal of Diastereoselectivity in an N-Acyliminium Ion Cyclization Leading to Hexahydropyrrolo[2,1-a]isoquinolines. B. E. MARYANOFF, B. E. MARYANOFFSearch for more papers by this authorD. F. MCCOMSEY, D. F. MCCOMSEYSearch for more papers by this authorH. R. JUN. ALMOND, H. R. JUN. ALMONDSearch for more papers by this authorM. S. MUTTER, M. S. MUTTERSearch for more papers by this authorG. W. BEMIS, G. W. BEMISSearch for more papers by this authorR. R. WHITTLE, R. R. WHITTLESearch for more papers by this authorR. A. OLOFSON, R. A. OLOFSONSearch for more papers by this author B. E. MARYANOFF, B. E. MARYANOFFSearch for more papers by this authorD. F. MCCOMSEY, D. F. MCCOMSEYSearch for more papers by this authorH. R. JUN. ALMOND, H. R. JUN. ALMONDSearch for more papers by this authorM. S. MUTTER, M. S. MUTTERSearch for more papers by this authorG. W. BEMIS, G. W. BEMISSearch for more papers by this authorR. R. WHITTLE, R. R. WHITTLESearch for more papers by this authorR. A. OLOFSON, R. A. OLOFSONSearch for more papers by this author First published: October 21, 1986 https://doi.org/10.1002/chin.198642086AboutPDF 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 onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume17, Issue42October 21, 1986 RelatedInformation
AbstractMittels 3′ PI′ Hl‐NMR‐spektroskopischer Untersuchungen der Wittig‐Reaktionen zwischen den aus den Phosphoniumbromiden (I) gebildeten Yliden und Benzaldehyd oder Hexanal ist das Verhältnis der cis‐ und trans‐Isomeren (II) bzw. (III) der gebildeten Oxaphosphetane und ihrer Zersetzungsprodukte (IV) und (V) bestimmbar.