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Author: Jean-Pierre Majoral
Publisher: Springer Science & Business Media
ISBN: 3540440860
Category : Biochemistry
Languages : en
Pages : 268
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Book Description
Strong non-ionic bases are highly advantageous as stoichiometric reagents and as catalysts in synthetic organic chemistry owing to side reactions that f- quently occur when ionic bases such as LDA or alkali metal alkoxides are employed. A second reason that non-ionic bases are frequently more useful in these applications is that such bases are often more soluble in less polar organic solvents, particularly at low temperatures. Thirdly, non-ionic bases can provide reactive naked or tightly associated deprotonated substrate anions that are s- bilized by the relatively large, poorly solvated cations formed by the protonated base. In such cations, extensive positive charge delocalization can occur. Prior to our work on pro-azaphosphatranes of type 1 (Scheme 1), the very strong n- ionic bases utilized for organic transformations were largely confined to the nitrogenous bases shown below (Scheme 2). Scheme 1 Scheme 2 4 J.G. Verkade 2 Uses of Strong Nonionic Nitrogen Bases 2. 1 Amines One of the earliest strong non-ionic bases to make its appearance was Proton Sponge and its derivatives [1] and these systems have been reviewed [2]. More recently Proton Sponge has been used in the palladium-catalyzed arylation of 2,3-dihydrofuran [3], and it also catalyzes Knoevenagel condensations of s- strates possessing activated methylene groups [4]. Recently the synthesis of the macrocyclic tetramine below (Scheme 3) was reported [5]. The encrypted nitrogens are very basic (pK,24.
Author: Jean-Pierre Majoral
Publisher: Springer Science & Business Media
ISBN: 3540440860
Category : Biochemistry
Languages : en
Pages : 268
Get Book
Book Description
Strong non-ionic bases are highly advantageous as stoichiometric reagents and as catalysts in synthetic organic chemistry owing to side reactions that f- quently occur when ionic bases such as LDA or alkali metal alkoxides are employed. A second reason that non-ionic bases are frequently more useful in these applications is that such bases are often more soluble in less polar organic solvents, particularly at low temperatures. Thirdly, non-ionic bases can provide reactive naked or tightly associated deprotonated substrate anions that are s- bilized by the relatively large, poorly solvated cations formed by the protonated base. In such cations, extensive positive charge delocalization can occur. Prior to our work on pro-azaphosphatranes of type 1 (Scheme 1), the very strong n- ionic bases utilized for organic transformations were largely confined to the nitrogenous bases shown below (Scheme 2). Scheme 1 Scheme 2 4 J.G. Verkade 2 Uses of Strong Nonionic Nitrogen Bases 2. 1 Amines One of the earliest strong non-ionic bases to make its appearance was Proton Sponge and its derivatives [1] and these systems have been reviewed [2]. More recently Proton Sponge has been used in the palladium-catalyzed arylation of 2,3-dihydrofuran [3], and it also catalyzes Knoevenagel condensations of s- strates possessing activated methylene groups [4]. Recently the synthesis of the macrocyclic tetramine below (Scheme 3) was reported [5]. The encrypted nitrogens are very basic (pK,24.
Author: Jean-Pierre Majoral
Publisher: Springer Science & Business Media
ISBN: 9783540224983
Category : Biochemistry
Languages : en
Pages : 300
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Book Description
Phosphorus chemistry is a diverse field and this volume focuses on new developments of "old themes" with different approaches and ideas, state of the art for two topics of general interest, and the emerging fields of research. This volume only describes in part the huge number of original papers on phosphorus-related topics.
Author: Jean-Pierre Majoral
Publisher: Springer
ISBN: 3540461000
Category : Science
Languages : en
Pages : 263
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Book Description
Annotation What makes phosphorus so attractive that virtually every chemist can profit from its properties? Applications in different fields have already been realized or are undercurrent investigation.
Author: Jean-Pierre Majoral
Publisher: Springer Science & Business Media
ISBN: 3540422463
Category : Science
Languages : en
Pages : 250
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Book Description
Undoubtedly the chemistry of phosphorus appears more and more attractive in the sense that phosphorus presents an extraordinary versatile behaviour that allows the synthesis of a large number of different phosphorus reagents usable for applications in different fields, from biology to material science without f- getting key applications in catalysis. The full maturity of this topic of research can be explained by all the acquired knowledge over these twenty last years. Organic and inorganic chemistries of P, P and P species have been the s- in]V v ject of thousands of publications while the chemistry of low coordinated ph- phorus derivatives experienced its hour of glory from the 1970s to the early 1990s. In parallel, interactions between phosphorus compounds and transition metals afforded many complexes, a lot of which present fascinating properties as catalysts. The interest in all these themes really is not decreasing, indeed some fas- nating areas of research are emerging or are the subject of many investigations: the medicinal chemistry of bisphosphonates, the role of phosphorus in biology, phosphorus ligands in radiopharmaceutical chemistry, phosphorus in material science, new polymers and dendrimers incorporating phosphorus, and as- metric catalysis to name but a few. Indeed researchers, benefitting from their background in basic phosphorus chemistry are developing many new fields of research.
Author: Jean-Pierre Majoral
Publisher: Springer
ISBN: 9783540440864
Category : Science
Languages : en
Pages : 263
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Book Description
.
Author: Jean-Pierre Majoral
Publisher:
ISBN: 9783662146545
Category :
Languages : en
Pages : 260
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Book Description
Author: Jean-Pierre Majoral
Publisher: Springer Science & Business Media
ISBN: 9783540007142
Category : Biochemistry
Languages : en
Pages : 238
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Book Description
Author: Jean-Pierre Majoral
Publisher: Springer
ISBN: 9783662145630
Category : Science
Languages : en
Pages : 266
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Book Description
with contributions by numerous experts
Author: Jean-Pierre Majoral
Publisher: Springer
ISBN: 3540457313
Category : Science
Languages : en
Pages : 244
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Book Description
Undoubtedly the chemistry of phosphorus appears more and more attractive in the sense that phosphorus presents an extraordinary versatile behaviour that allows the synthesis of a large number of different phosphorus reagents usable for applications in different fields, from biology to material science without f- getting key applications in catalysis. The full maturity of this topic of research can be explained by all the acquired knowledge over these twenty last years. Organic and inorganic chemistries of P , P and P species have been the s- in ]V v ject of thousands of publications while the chemistry of low coordinated ph- phorus derivatives experienced its hour of glory from the 1970s to the early 1990s. In parallel, interactions between phosphorus compounds and transition metals afforded many complexes, a lot of which present fascinating properties as catalysts. The interest in all these themes really is not decreasing, indeed some fas- nating areas of research are emerging or are the subject of many investigations: the medicinal chemistry of bisphosphonates, the role of phosphorus in biology, phosphorus ligands in radiopharmaceutical chemistry, phosphorus in material science, new polymers and dendrimers incorporating phosphorus, and as- metric catalysis to name but a few. Indeed researchers, benefitting from their background in basic phosphorus chemistry are developing many new fields of research.
Author: Jean-Luc Montchamp
Publisher: Springer
ISBN: 3319155121
Category : Science
Languages : en
Pages : 277
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Book Description
Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field.
