r scheffold (14 resultados)

Condición: Fair. This is an ex-library book and may have the usual library/used-book markings inside.This book has hardback covers. In fair condition, suitable as a study copy. No dust jacket. Please note the Image in this listing is a stock photo and may not match the covers of the actual item,1250grams, ISBN:3527284893.

Condición: Gut. 440 S.* mit zahlr. Abb.s/w, Text engl. 8° Softcover, ausgeschiedenes Exemplar einer Universitätsbibliothek, gestempelt im Vorsatz und div., Aufkleber auf Buchrücken (entfernt), stärkere Gebrauchsspuren an Ecken und Kanten, Schnitt angestaubt, einige Seiten innen am Block verstärkt (in sich alles fest), innen gutes Exemplar N5 Sprache: Englisch Gewicht in Gramm: 750.

Condición: As New. Unread book in perfect condition.

Condición: New. In.

Condición: New.

Paperback. Condición: Brand New. 368 pages. 8.27x5.83x0.83 inches. In Stock.

Taschenbuch. Condición: Neu. Modern Synthetic Methods 1986 | Conference Papers of the International Seminar on Modern Synthetic Methods 1986, Interlaken, April 17th/18th 1986 | R. Scheffold | Taschenbuch | viii | Englisch | 1986 | Springer | EAN 9783540165262 | Verantwortliche Person für die EU: Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg, juergen[dot]hartmann[at]springer[dot]com | Anbieter: preigu.

Taschenbuch. Condición: Neu. Druck auf Anfrage Neuware - Printed after ordering - In the tricyclooctanone approach to polyquinane syntheses[ll the photochemical rearrangement of bicyclo[2.2.2]octenone, 1a 2a,[2J has been the initial key reaction providing tricyclo 2 [3.3.0.0 ' S]octan-3-one as a chiral building block.[3-SJ This reaction - an oxadi-n-methane (ODPM) process - and the 1,3-acyl shift (AS) forming the cyclobutanone 3 are quite generally the characteristic re arrangement paths undergone by ~,~-unsaturated ketones (~,~-UKs) upon triplet sensitization and direct excitation with ultraviolet light, respectively. R' R' hv hv R~O ~ ~ (sens) WO ~ R ONR R 1a-c 2a-c 3a-c a R=R'=H b R = CH , R'= H 3 c R = R'= CH 3 As a polyvalent building block, the enantiomers of which are readily accessible from cheap bulk chemicals such as benzene and its derivatives, the parent system 1a and three younger generations of its class (Sections 3.1. - 3.4.) have no equal among synthetically useful photochemical rearrangements. 2. THE PHOTOCHEMISTRY OF ~,~-UNSATURATED KETONES The literature dealing with the spectroscopy and photo chemistry of ~,~-UKs has been exhaustively and critically reviewed around 1975 by Dauben et al.[6l and Houk,[7J and in 1980 by Schuster.[SlI1 The 1,3-AS was first observed on direct excitation of 1) For more recent papers on i3,~-UK photochemistry see [9-24]. 64 ~ R' hv ~o hv .,.

Paperback. Condición: Very Good. Very Good. book.

32. Condición: Wie neu. Sprache: Deutsch.

Taschenbuch. Condición: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In the tricyclooctanone approach to polyquinane syntheses[ll the photochemical rearrangement of bicyclo[2.2.2]octenone, 1a 2a,[2J has been the initial key reaction providing tricyclo 2 [3.3.0.0 ' S]octan-3-one as a chiral building block.[3-SJ This reaction - an oxadi-n-methane (ODPM) process - and the 1,3-acyl shift (AS) forming the cyclobutanone 3 are quite generally the characteristic re arrangement paths undergone by ~,~-unsaturated ketones (~,~-UKs) upon triplet sensitization and direct excitation with ultraviolet light, respectively. R' R' hv hv R~O ~ ~ (sens) WO ~ R ONR R 1a-c 2a-c 3a-c a R=R'=H b R = CH , R'= H 3 c R = R'= CH 3 As a polyvalent building block, the enantiomers of which are readily accessible from cheap bulk chemicals such as benzene and its derivatives, the parent system 1a and three younger generations of its class (Sections 3.1. - 3.4.) have no equal among synthetically useful photochemical rearrangements. 2. THE PHOTOCHEMISTRY OF ~,~-UNSATURATED KETONES The literature dealing with the spectroscopy and photo chemistry of ~,~-UKs has been exhaustively and critically reviewed around 1975 by Dauben et al.[6l and Houk,[7J and in 1980 by Schuster.[SlI1 The 1,3-AS was first observed on direct excitation of 1) For more recent papers on i3,~-UK photochemistry see [9-24]. 64 ~ R' hv ~o hv ., 368 pp. Englisch.

Condición: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Sponsored and organized by the Association of Swiss ChemistsSound and Light in Synthesis.- Ultrasound in Synthesis.- Photochemically Generated Building Blocks I.- Photochemically Generated Building Blocks II The Tricyclooctanone Approach.- Synthesis of .

Condición: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. This paperback is the conference documentation of the fifth Seminar on MODERN SYNTHETIC METHODS 1989. It is the aim of these triennial Interlaken-Seminars to provide a proper, concine and ready for use acceos to important and rapidly developing areas of s.

Taschenbuch. Condición: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Sound and Light in Synthesis.- Ultrasound in Synthesis.- Photochemically Generated Building Blocks I.- Photochemically Generated Building Blocks II The Tricyclooctanone Approach.- Synthesis of Enantiomerically Pure Compunds with C,C Bond Formation.- EPC Syntheses with C,C Bond Formation via Acetals and Enamines.- Asymmetric Diels-Alder Reactions with Chiral Enoates as Dienophiles.- Enantiomerically Pure Compounds via Chiral Organoboranes.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 368 pp. Englisch.