New Directions in the Chemistry

A new direction in the chemistry of hypervalent silicon compounds has recently been developed by Tacke and coworkers the chemistry of zwitterionic organosilicates28-31. In these compounds the silicon is formally negative, with a cationic nitrogen attached to it by an alkyl chain. One of the groups of products of this general class is the pentacoordinate zwitterionic fluorosilicates31. 

The idea for the REACTIVITY NETWORK(2) began as early as 1978 at an international conference on introductory chemistry entitled "New Directions in the Chemistry Curriculum"(t) held at McMaster University. Participants in this Conference agreed that the general chemistry courses at both the high school and college levels are overloaded with theory. Worse still, this oversimplified theory is presented to an audience insufficiently mature to... 

It would seem likely that tetrazolium salts are only one class of a wider variety of redox indicators acting through reductive ring opening, and that many more examples will be discovered in the future that may open some new directions to the chemistry of tetrazolium salts. 

The articles contained in this series will discuss in detail the work originating from the author s laboratory. This work will be placed in the context of other similar work which has already been accomplished or is currently in progress. The format will be both explicit and pedagogical so that these articles should be of interest to novices as well as experts in the field. It is expected that a certain amount of historical background will be provided as well as speculation on possible new directions which the chemistry under discussion might follow. 

There is a rich synthetic potential for enamines in heterocyclic synthesis. Enamines can react as electrophiles or nucleophiles and as new partners in cycloaddition reactions. Various derivatives of nitrogen-, oxygen-, and sulfur-containing heterocycles have been prepared, and these, in turn, are of interest as starting materials for additional syntheses. They represent potential synthons for the development of various new directions in organic chemistry. 

In addition to the classical Haber process, recent efforts have been directed to finding an alternative economic process for fixing N2 to meet-increasing demands for nitrogeneous fertilizers and others industrial requirements. Thus, numerous results of the recent advances in the Chemistry of Nitrogen Fixation via transition metal complexes have reported (Chatt et al. 1978 A treatise on dinitrogen fixation , Hardy ed. 1979 New trends in the chemistry of nitrogen fixation , Chatt ed.1980). 

C.M. Surko, F.A. Gianturco, Eds. New Direction in Antimatter Chemistry and Physics, Dordrecht, The Netherlands Kluer Acad. Press (2001). 

The metal vapor technique, in which a metal is vaporized from a resistively heated tungsten container under high vacuum and is cocondensed with a potential ligand at -125 to -196°C, had proven useful in the synthesis of a variety of unusual low-valent transition metal complexes (67-71). With lanthanide metals, this method not only has generated low oxidation state species, but it has also provided the opportunity to study zero-valent lanthanide chemistry on an atomic/molecular basis for the first time. These studies have been important in identifying new directions in organolanthanide chemistry. 

J. R. R. Christie and J. V. Golinski, The Spreading of the Word New Directions in the Historiography of Chemistry, 1600-1800, History of Science 20, 1982, 235-266 Jan Golinski, Science as Public Culture (Cambridge University Press, 1992). 

Banerjee SR, Maresca KP, Francesconi L, ValUant J, Babich JW, Zubieta J. New directions in the coordination chemistry of 99mTc a reflection on technetium core structures and a strategy for new chelate design. Nucl. Med. Biol. 2005 32 1-20. 

The allylation reactions of carbonyl compounds catalyzed by chiral Lewis acids represent a powerful new direction in allylmetal chemistry. Yamamoto and coworkers reported the first example of the catalytic enantioselective allylation reaction in 1991, using the chiral (acyloxy)borane (CAB) catalyst system (see below) [288]. Since then, several additional reports of the catalytic allylation reaction have appeared. To date, the most effective catalyst systems reported for the enantioselective reaction of aldehydes and Type II allyl- and crotylstannane and silane reagents include the Yamamoto CAB catalyst and catalysts complexes composed of various Lewis acidic metals and either the BINOL or BINAP chiral ligands [289-293]. Marshall and Cozzi have recently reviewed progress in the enantioselective catalytic allylation reaction [294, 295]. 

Starosotnikov AM, Bastrakov MA, Shevelev SA, Goumont R, ToiierF (2009) Abstracts of the international conference on new directions in heterocyclic chemistry. May 3-8, 2009 [in Russian], Kislovodsk S-441... 

One of the important directions in the chemistry and technology of macro-molecular compounds is the synthesis of new polymerie products through the chemical modification of existing polymers [1]. 

Hagadone, T. R. Current Approaches and New Directions in the Management of In-House Chemical Structure Databases . In Chemical Structures The International Language of Chemistry, Warr, W.A., Ed. Springer-Verlag Berlin, 1988 pp. 23-41. 

Sparked a need to acknowledge the biology nature of the tissue as well as new directions in the resin chemistry that has been used in dental adhesive systems for the past 40 years. Some of the emerging and future concepts are detailed in the two sub-items below. 

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