The rearrangement of α-pinene to camphene in an acidic environment, a reaction widely used on an industrial scale, has been studied by use of DFT/DZP theoretical methods. p-Menthadienes were rationalized as the main products of the proton catalyzed reaction whereby camphene is the main product if a catalyst providing a taylor made environment is present. Tricyclene, bornylene and α-fenchene are shown to be byproducts.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Abstract The past decade has witnessed an upsurge of interest in molecular recognition processes. Whereas the syntheses of new host structures initially stood to the fore, more recent studies have concentrated on the selectivity of supramolecular structures, on hydrophobic interactions, base pairing due to hydrogen bridges, hydrogen bridging in the interior of molecular niches, complexation of anions, and highly selective and extremely efficient cation complexation. Whilst simple cation complexation by use of crown compounds, cryptands, and podands is understood quite well at the present time, and is used synthetically, more complex synthetic host structures often exhibit surprising properties. Triply bridged macrobicyclic host structures, constructed according to a modular building concept, have aroused special interest. They allow the construction of tailor-shaped host cavities, which encapsulate the guest almost completely. If intraannular donor functions are present, varying receptor capabilities are obtained. Yet, unfunctionalized molecular niches allowing hydrophobic interactions have also attracted attention.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Design and synthesis of new triply bridged host molecules are described based on the convex/concave complementarity of guest and host. Syntheses have been facilitated through the development and use of a modular synthetic strategy using exchangable building blocks suitable for small as well as for large host cavities. Some of the hosts contain the largest molecular cavities known up till now: They are used successfully for the molecular recognition of functionalized benzene derivatives like 1,3,5-trihydroxybenzene (resorcinol). It is shown that isomeric phenolic guest molecules are selectively discriminated by the new host compounds bearing matching cavities. Complexation of organic guest molecules by enclosure inside the hosts cavities has been possible in water as well as in lipophilic solvents using hosts bearing either solubilizing functions or donor groups.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConvergent functional groups. 9. Complexation in new molecular cleftsJames S. Nowick, Pablo Ballester, Frank Ebmeyer, and Julius Rebek Jr.Cite this: J. Am. Chem. Soc. 1990, 112, 24, 8902–8906Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November 1990https://pubs.acs.org/doi/10.1021/ja00180a038https://doi.org/10.1021/ja00180a038research-articleACS PublicationsRequest reuse permissionsArticle Views3122Altmetric-Citations97LEARN 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 Get e-Alerts

Ein allosterischer Effekt scheint dafür verantwortlich zu sein, daß das Gastmolekül 1 mit Hydrazin, Ethylendiamin und 1,4‐Diazabicyclo[2.2.2]octan (DABCO) 1:2‐Komplexe bildet, wobei die zweite Assoziationskonstante um den Faktor 50, 200 bzw. 2 größer ist als die erste. Diese positive kooperative Wechselwirkung ist in den ersten beiden Fällen viel stärker als bei ditopen Kronenethern.magnified image

AbstractThe ligand (I), previously used to prepare a hemicaged Ru(II) complex, is now used to bind one, two or three (Ru(bipy)2)2+ units.

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

AbstractThe synthesis of three new macrobicyclic compounds such as the large‐cavity compound (IIIa) and the compound (IIIb) with a conical cavity is described.

AbstractCyclization of the bis(4‐acylphenyl)propanes (I) by reductive coupling with low‐valent titanium (McMurry reaction) can be directed either to the (3.2)paracyclophanenes (II) or to the (3.2.3.2)paracyclophanedienes (III).

ChemInformVolume 21, Issue 8 Article ChemInform Abstract: A Large Macrobicyclic Cavity for the Selective Complexation of Alkali Metal Ions. J. PETER-KATALINIC, J. PETER-KATALINIC Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this authorF. EBMEYER, F. EBMEYER Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this authorC. SEEL, C. SEEL Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this authorF. + VOEGTLE, F. + VOEGTLE Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this author J. PETER-KATALINIC, J. PETER-KATALINIC Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this authorF. EBMEYER, F. EBMEYER Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this authorC. SEEL, C. SEEL Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this authorF. + VOEGTLE, F. + VOEGTLE Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this author First published: February 20, 1990 https://doi.org/10.1002/chin.199008052Read the full textAboutPDF 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. Volume21, Issue8February 20, 1990 RelatedInformation

AbstractDie Liganden 2 und 3 wurden in einer Eintopf‐Synthese ausgehend von den Triaminen 11 und 12 sowie 5,5′‐Bis(brommethyl‐2,2′‐bipyridin (6) erhalten und als Natrium‐Komplexe isoliert und charakterisiert. Die dynamische 1H‐NMR‐Spektroskopie des Komplexes 2 · Na⊕ belegt seine konformative Beweglichkeit.

ChemInformVolume 20, Issue 4 Physical Organic Chemistry ChemInform Abstract: Ruthenium(II)-Polypyridine Cage Complexes: Luminescence and Photochemical Properties. L. DE COLA, L. DE COLA Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorF. BARIGELLETTI, F. BARIGELLETTI Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorV. BALZANI, V. BALZANI Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorP. BELSER, P. BELSER Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorA. VON ZELEWSKY, A. VON ZELEWSKY Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorF. + VOEGTLE, F. + VOEGTLE Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorF. EBMEYER, F. EBMEYER Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorS. GRAMMENUDI, S. GRAMMENUDI Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this author L. DE COLA, L. DE COLA Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorF. BARIGELLETTI, F. BARIGELLETTI Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorV. BALZANI, V. BALZANI Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorP. BELSER, P. BELSER Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorA. VON ZELEWSKY, A. VON ZELEWSKY Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorF. + VOEGTLE, F. + VOEGTLE Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorF. EBMEYER, F. EBMEYER Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this authorS. GRAMMENUDI, S. GRAMMENUDI Dip. Chim., "G. Ciamician"Univ., Bologna, ItalySearch for more papers by this author First published: January 24, 1989 https://doi.org/10.1002/chin.198904056Read the full textAboutPDF 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 onEmailFacebookTwitterLinkedInRedditWechat No abstract is available for this article. References L. DE COLA, F. BARIGELLETTI, V. BALZANI, P. BELSER, A. VON ZELEWSKY, F. + VOEGTLE, F. EBMEYER, S. GRAMMENUDI, Ruthenium(II)-Polypyridine Cage Complexes: Luminescence and Photochemical Properties., J. Am. Chem. Soc., 1988, 110, 7210. 10.1021/ja00229a044 CASWeb of Science®Google Scholar Volume20, Issue4January 24, 1989 ReferencesRelatedInformation

A Large Macrobicyclic cavity for the Selective Complexation of Alkali Metal IonsThe preparation of the new ligand 3 was carried out starting with the podand 8 and the triamine 11. Ligand 3 forms complexes with alkali metal ions in solution (chloroform) as well as under the conditions of FAB mass spectrometry, whereby Cs⊕ selectivity is observed.

ChemInformVolume 20, Issue 48 Heterocyclic Compounds ChemInform Abstract: Template Synthesis of Macrobicyclic Large Cavities of the Tris(bipyridine) Type (III). F. EBMEYER, F. EBMEYER Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this authorF. + VOEGTLE, F. + VOEGTLE Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this author F. EBMEYER, F. EBMEYER Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this authorF. + VOEGTLE, F. + VOEGTLE Inst. Org. Chem. Biochem., Univ. Bonn, D-5300 Bonn 1Search for more papers by this author First published: November 28, 1989 https://doi.org/10.1002/chin.198948210AboutPDF 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. Volume20, Issue48November 28, 1989 RelatedInformation

The host compound 1 with a conical cavity binds, like two related hosts, trihydroxybenzenes, which are thereby noticeably stabilized towards oxidation. The results suggest multiple hydrogen bonding between host and guest in the cavity.

AbstractThe absorption spectra, emission spectra, luminescence lifetimes, luminescence quantum yields, luminescence quenching by dioxygen, photochemical behavior, and redox potentials of the complexes (II) and (III) are studied and compared with those of the parent compounds (I).

Die Wirtverbindung 1 mit einem konischen Hohlraum bindet, wie auch zwei verwandte Wirte, Trihydroxybenzole, die dadurch gegenüber Oxidation auffallend stabilisiert werden. Die Ergebnisse sprechen für eine mehrfache Wasserstoffbrückenbindung zwischen Wirt und Gast im Hohlraum. magnified image