Akhrem a a (34 resultados)

Paperback. Condición: new. Paperback. Birch reduction (see reviews [1-5]) is the name given to the reaction of unsaturated organic compounds with alkali metals and alcohols in liquid am monia. This method was first used for aromatic compounds in 1937 by Wooster [6J, who showed that benzene and its derivatives are reduced by sodium in liq uid ammonia in the presence of an alcohol, while this reaction does not take place in the absence of an alcohol. However, the general recognition and broad application of this reaction was achieved only after a series of investigations by Birch published from 1944 onwards [7J. Since the presence of an alcohol in the reaction medium is not indispen sable for pOlycyclic aromatic systems, the present review includes only deriv atives of the simplest aromatic compounds - benzene and naphthalene. 1 Reaction Mechanism The most probable mechanism of Birch reduction, adopted by the major ity of workers in this field [4, 8 -12] can be represented by the following stages: 'v\ I NH -'" , - i T 1 3 +--"'( a) , , ,e (NHa) NH 3) + ROH ----+ () ll. . (NHa) A H H 4) H H 5) ')', ",\\+ + RO" ~ Q + 110M, / (NHa) . (NH:,) Q H H Ii Ij H H H H H+ X/~H M,l Birch reduction (see reviews [1-5]) is the name given to the reaction of unsaturated organic compounds with alkali metals and alcohols in liquid am monia. - i T 1 3 +--"'( a) , , ,e (NHa) NH 3) + ROH ----+ () ll. (NHa) A H H 4) H H 5) ')', ",\\+ + RO" ~ Q + 110M, / (NHa) . (NH:,) Q H H Ii Ij H H H H H+ X/~H M,l Shipping may be from multiple locations in the US or from the UK, depending on stock availability.…

Condición: New. pp. 132.

Condición: New. pp. 132 23:B&W 6 x 9 in or 229 x 152 mm Perfect Bound on White w/Gloss Lam.

Hardcover. Condición: Good. Estado de la sobrecubierta: Good. 0306303809. Blue cloth hardcover, in a good jacket, with light corner wear, from closed pharmaceutical company library. Lending record shows this book has been borrowed once only. 362 pages, index, illustrated. Methods for obtaining steroids can be divided into four groups: isolation from natural sources, microbiological synthesis, partial synthesis from natural raw material already containing the steroid skeleton, and total chemical synthesis from precursors of simple products. Contents clean, tight and bright.…

Condición: New. pp. 132.

Condición: New.

Paperback or Softback. Condición: New. Birch Reduction of Aromatic Compounds. Book.

Original cloth with (bit edgeworn / repaired) dustjacket, else in (very) good condition. From the personal collection of a chemist without any markings / not an ex-library copy. Please see description or ask for photos.

Condición: As New. Unread book in perfect condition.

Hardcover. Condición: Fair condition (VG internally). Poor dust jacket. First American Edition. New York / London:: Plenum Press, 1970. Translated from Russian by B. J. Hazzard. The endpapers, Dust Jacket, and blue cloth cover of this book are badly waterstained. However, the text is NOT affected by the stain. All text is clean and unmarked. A solid reading/reference copy. Includes a bibliography with 1,126 entries. Index. . First American Edition. Hard Cover. Fair condition (VG internally)/Poor dust jacket. 8vo. xi, 362pp.…

Condición: New.

Condición: New.

Condición: As New. Unread book in perfect condition.

Paperback. Condición: Brand New. reprint edition. 132 pages. 9.02x5.98x0.30 inches. In Stock.

Condición: New.

Taschenbuch. Condición: Neu. Druck auf Anfrage Neuware - Printed after ordering - Birch reduction (see reviews [1-5]) is the name given to the reaction of unsaturated organic compounds with alkali metals and alcohols in liquid am monia. This method was first used for aromatic compounds in 1937 by Wooster [6J, who showed that benzene and its derivatives are reduced by sodium in liq uid ammonia in the presence of an alcohol, while this reaction does not take place in the absence of an alcohol. However, the general recognition and broad application of this reaction was achieved only after a series of investigations by Birch published from 1944 onwards [7J. Since the presence of an alcohol in the reaction medium is not indispen sable for pOlycyclic aromatic systems, the present review includes only deriv atives of the simplest aromatic compounds - benzene and naphthalene. 1 Reaction Mechanism The most probable mechanism of Birch reduction, adopted by the major ity of workers in this field [4, 8 -12] can be represented by the following stages: 'v I NH -'' , - i T 1 3 +--''( a) , , ,e (NHa) NH 3) + ROH ----+ () ll. . (NHa) A H H 4) H H 5) ')', ',+ + RO' ~ Q + 110M, / (NHa) . (NH:,) Q H H Ii Ij H H H H H+ X/~H M,l.…

Paperback. Condición: new. Paperback. Birch reduction (see reviews [1-5]) is the name given to the reaction of unsaturated organic compounds with alkali metals and alcohols in liquid am monia. This method was first used for aromatic compounds in 1937 by Wooster [6J, who showed that benzene and its derivatives are reduced by sodium in liq uid ammonia in the presence of an alcohol, while this reaction does not take place in the absence of an alcohol. However, the general recognition and broad application of this reaction was achieved only after a series of investigations by Birch published from 1944 onwards [7J. Since the presence of an alcohol in the reaction medium is not indispen sable for pOlycyclic aromatic systems, the present review includes only deriv atives of the simplest aromatic compounds - benzene and naphthalene. 1 Reaction Mechanism The most probable mechanism of Birch reduction, adopted by the major ity of workers in this field [4, 8 -12] can be represented by the following stages: 'v\ I NH -'" , - i T 1 3 +--"'( a) , , ,e (NHa) NH 3) + ROH ----+ () ll. . (NHa) A H H 4) H H 5) ')', ",\\+ + RO" ~ Q + 110M, / (NHa) . (NH:,) Q H H Ii Ij H H H H H+ X/~H M,l Birch reduction (see reviews [1-5]) is the name given to the reaction of unsaturated organic compounds with alkali metals and alcohols in liquid am monia. - i T 1 3 +--"'( a) , , ,e (NHa) NH 3) + ROH ----+ () ll. (NHa) A H H 4) H H 5) ')', ",\\+ + RO" ~ Q + 110M, / (NHa) . (NH:,) Q H H Ii Ij H H H H H+ X/~H M,l Shipping may be from our Sydney, NSW warehouse or from our UK or US warehouse, depending on stock availability.…

Condición: New.

Condición: As New. Unread book in perfect condition.

Condición: New.

Condición: As New. Unread book in perfect condition.

Taschenbuch. Condición: Neu. Druck auf Anfrage Neuware - Printed after ordering - Since the appearance of the Russian edition of this monograph (1967), the main tendencies of the development of total synfuesis have not changed. The accelerated accumulation of experimental material is continuing, mainly in the form of the improvement of already-existing synthesis schemes. The main new advance is the development of asymmetric syn theses with intermediates that have made it possible to avoid the main dis advantage of total synthesis - the formation of racemic final compounds. The most important work that has appeared since the appearance of the Russian edition is given in an Appendix to the book. Apart from this, only a very slight rearrangement of the material and of some of the schemes has been carried out for the American edition. A. A. Akhrem Yu. A. Titov Moscow, July 1968 v Preface to the Russian Edition Steroids are one of the most interesting and most widely distributed and, at the same time, one of the most structurally complex groups of natural compounds. In spite of this, the great theoretical and practical importance of steroids for biology and medicine has led to very intensive scientific research work on their synthesis. The numerous methods for obtaining steroids developed at the present time can be divided into four main groups: isolation from natural sources, microbiological synthesis, partial synthesis from natural raw material already containing the steroid skeleton, and, finally, total chemical synthesis from precursors of com paratively simple structure. …

Condición: New. pp. 376.

Paperback. Condición: Brand New. reprint edition. 373 pages. 9.45x6.61x0.85 inches. In Stock.

Condición: new. Questo è un articolo print on demand.

Taschenbuch. Condición: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Birch reduction (see reviews [1-5]) is the name given to the reaction of unsaturated organic compounds with alkali metals and alcohols in liquid am monia. This method was first used for aromatic compounds in 1937 by Wooster [6J, who showed that benzene and its derivatives are reduced by sodium in liq uid ammonia in the presence of an alcohol, while this reaction does not take place in the absence of an alcohol. However, the general recognition and broad application of this reaction was achieved only after a series of investigations by Birch published from 1944 onwards [7J. Since the presence of an alcohol in the reaction medium is not indispen sable for pOlycyclic aromatic systems, the present review includes only deriv atives of the simplest aromatic compounds - benzene and naphthalene. 1 Reaction Mechanism The most probable mechanism of Birch reduction, adopted by the major ity of workers in this field [4, 8 -12] can be represented by the following stages: 'v I NH -'' , - i T 1 3 +--''( a) , , ,e (NHa) NH 3) + ROH ----+ () ll. . (NHa) A H H 4) H H 5) ')', ',+ + RO' ~ Q + 110M, / (NHa) . (NH:,) Q H H Ii Ij H H H H H+ X/~H M,l 132 pp. Englisch.…

Condición: new. Questo è un articolo print on demand.

Taschenbuch. Condición: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Birch reduction (see reviews [1-5]) is the name given to the reaction of unsaturated organic compounds with alkali metals and alcohols in liquid am monia. This method was first used for aromatic compounds in 1937 by Wooster [6J, who showed that benzene and its derivatives are reduced by sodium in liq uid ammonia in the presence of an alcohol, while this reaction does not take place in the absence of an alcohol. However, the general recognition and broad application of this reaction was achieved only after a series of investigations by Birch published from 1944 onwards [7J. Since the presence of an alcohol in the reaction medium is not indispen sable for pOlycyclic aromatic systems, the present review includes only deriv atives of the simplest aromatic compounds - benzene and naphthalene. 1 Reaction Mechanism The most probable mechanism of Birch reduction, adopted by the major ity of workers in this field [4, 8 -12] can be represented by the following stages: 'v I NH -'' , - i T 1 3 +--''( a) , , ,e (NHa) NH 3) + ROH ----+ () ll. . (NHa) A H H 4) H H 5) ')', ',\\+ + RO' ~ Q + 110M, / (NHa) . (NH:,) Q H H Ii Ij H H H H H+ X/~H M,lSpringer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 132 pp. Englisch.…

PF. Condición: New. This item is printed on demand. Brand new book, sourced directly from publisher. Dispatch time is 6-7 days from our warehouse. Book will be sent in robust, secure packaging to ensure it reaches you securely.

Taschenbuch. Condición: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Since the appearance of the Russian edition of this monograph (1967), the main tendencies of the development of total synfuesis have not changed. The accelerated accumulation of experimental material is continuing, mainly in the form of the improvement of already-existing synthesis schemes. The main new advance is the development of asymmetric syn theses with intermediates that have made it possible to avoid the main dis advantage of total synthesis - the formation of racemic final compounds. The most important work that has appeared since the appearance of the Russian edition is given in an Appendix to the book. Apart from this, only a very slight rearrangement of the material and of some of the schemes has been carried out for the American edition. A. A. Akhrem Yu. A. Titov Moscow, July 1968 v Preface to the Russian Edition Steroids are one of the most interesting and most widely distributed and, at the same time, one of the most structurally complex groups of natural compounds. In spite of this, the great theoretical and practical importance of steroids for biology and medicine has led to very intensive scientific research work on their synthesis. The numerous methods for obtaining steroids developed at the present time can be divided into four main groups: isolation from natural sources, microbiological synthesis, partial synthesis from natural raw material already containing the steroid skeleton, and, finally, total chemical synthesis from precursors of com paratively simple structure. 376 pp. Englisch.…