Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

New Promising Developments

The activation of oxygen by Pd(OAc)2 in an acidic aqueous medium for the cleavage of different alkenes [133] is another interesting approach for environmentally benign processes as alternatives to ozonolysis. Although most compounds tested possessed activated double bonds, 2-nonene could be cleaved to form hep-tanal in 68% yield. The method should be tested using OA. [Pg.343]

Other alternative reaction pathways to AA or MAA via hydroformylation of 7-octenoic acid or the respective ester and consecutive oxidation of the formed aldehydic group may fail due to the poor accessibility of the C8 compound needed as starting material. This is unfortunate because recent development in the selective hydroformylation to linear aldehydes using sophisticated phosphite ligands [134,135] may enable such reaction sequence. [Pg.343]

Probably, the use of AA in particular for the production of new high-performance polyamides and polyesters for high-quality applications and thus its production volume might be larger (production volumes of several lOOOOt/year), if the ozonolysis could be replaced by an alternative manufacturing process. However, opportunities for optimization were developed even for ozonolysis, which make the process safer, for example, processing in microstructured reactors. The new [Pg.343]

The aim of further research should be the development of robust catalysts, which activate oxygen in a nonradical manner, probably via biomimetic cascades, and which are also able to provide an oxidative cleavage of unactivated internal double bonds in unsaturated fatty acids. [Pg.344]

Thieme Rompp (2014) Rompp Online, Georg Thieme Verlag, Stuttgart, http // www.roempp.com/prod/ (accessed 23 September 2014). [Pg.344]


H-phosphonates and their immediate derivatives have numerous applications in different practical areas including agriculture, industry, medicine, etc. This is largely due to the versatility of these compounds, which allows for their use as phosphorylation agents for a variety of substrates. This chapter summarizes some of the most important practical applications of the H-phosphonates and their derivatives, as well as some new promising developments with application potential. [Pg.253]

In view of the difficulties related to the correlation of the Relative Density to the Cone resistance values (see Section S.4.3.5), rather than using literature correlations, a practical way forward could be to setup a site specific correlation. A tempting approach could be to correlate CPT test results with density measurements on undisturbed samples originated from adjacent boreholes. This is however not possible since undisturbed samples cannot be retrieved from boreholes in non-cohesive soils. Therefore, when setting up a site specific Relative Density - correlation, calibration chamber tests are required. New promising developments with nuclear density probes allow for direct measurement of densities (see Appendix B.2.3.2). [Pg.469]

The intensely developing technique of high-resolution IR-spectroscopy of dimers composed of two different molecules in supersonic cooled jets offers a new promising approach to the quantum dynamics of reaction complexes. In essence, this is a unique possibility of modelling low-temperature chemical reactions. [Pg.127]

In our laboratory this kind of research has been systematically carried out for a number of years. A certain progress has been made in developing new promising methods for the chemical modification of PAN and acrylonitrile (AN) copolymers, and in creating new types of fibres with technologically valuable properties. [Pg.98]

Approaches of de novo predictions, which try to calculate how the structural elements are folded into the 3D-stmcture (tertiary structure) of complete proteins are nowadays far away from reliable large-scale applications. On the other, hand this topic is under strong development indicated by recent successful results at the contest for structural prediction methods CASP4. With the fast growing number of experimentally solved 3D-stmctures of protein and new promising approaches like threading tools combined with experimental structural constraints, one can expect more reliable de novo predictions for 3D-protein structures in the future. [Pg.778]

New promising designs have been proposed such as the one under an extensive industrial study on plate IHX to develop fabrication, ISI methods and a design standard for gas reactors [51], and another plate-type design for the indirect cycle reactor plant [52]. These works demonstrate that a plate IHX would simplify integration in the primary system because of its drastically reduced size. [Pg.153]

Therefore, data on these compounds are difficult to summarize. Since certain five- and six-membered nitronates are easily assembled from simple molecules, some of the transformations considered in this section can be used for the development of new promising strategies for organic synthesis. [Pg.531]

These transformations were applied to develop a new promising method for synthesis of various bridged polycyclic systems66, viz. ketones 160 and 161. Tropone reacts with butenyl magnesium bromide (—78 °C, 75%) to form a mixture of 2-(3-butenyl)dihydrotropones 158 and 159, the pyrolysis of which (200-210 °C, neat or in heptane solution) leads to 60% total yield of the isomeric homoprotoadamantenones 160 and 161 and the tricyclic ketone 162 in a ratio of 58 18 24, respectively (equation 49)66. [Pg.765]

In contrast to established MALDI-MS techniques, DIOS-MS is a comparatively new technique. However, over the last five years, it has been gaining steadily more attention and promising results have already been obtained in all those cases, where interference from classic MALDI matrices needed to be avoided. Owing to the fact that DIOS-MS is still a juvenile technique, it is hard to predict future developments, but especially in the field of silicon modifications further promising developments can be foreseen, accompanied by new applications. [Pg.299]

The tasks of medicinal CROs in early drug development are summarized In Table 2.4. As each successive step in the new product development process becomes progressively more expensive, the challenge for them is to identify promising drug candidates early on (see Section 16.2). [Pg.18]

Weintraub, Arlene. Can Pfizer Prime the Pipeline Business Week 4,065 (December 31, 2007/fanuary 7, 2008) 90-91. The new president of research and development at Pfizer, Martin Mackay, hopes to improve the company s recent poor performance in developing new drugs. For example, many new promising drugs developed by the company have failed when undergoing large-scale tests. The article describes some of Mack-ay s plans to deal with such problems. [Pg.177]

Construction, maintenance, and rehabilitation costs for pavements have risen sharply during the past decade, while revenue for these purposes has leveled or declined. In an effort to offset these rising costs and reduce dependence on uncertain asphalt supplies, increased research and development activity throughout the world has been devoted to the development and implementation of new and improved materials for use in pavement construction and maintenance. The use of sulfur in asphalt paving materials has proven to be one of the more promising developments to come from these activities. [Pg.155]

This review summarizes the current state of materials development in nonlinear optics. The relevant properties and important materials constants of current commercial, and new, promising, inorganic and organic molecular and polymeric materials with potential in second and third order NLO applications are presented. [Pg.134]

Nanotechnology is gaining more and more popularity throughout industry. As a result, nanoparticle technology represents a new promising field of application to food powders, although current research and development is very much in its infancy. [Pg.213]

New promising technologies for future electron-beam lithography applications based on pyroelectrically induced electron emission from LiNbOs ferroelectrics [22] were recently proposed [23], The developed system possessing micrometer scale resolution used 1 1 electron beam projection. The needed electron pattern was obtained by means of deposited micrometer-size Ti-spots on the polar face of LiNbOs. Another solution for the high resolution electron lithography may be found in nanodomain patterning of a ferroelectric template. [Pg.192]


See other pages where New Promising Developments is mentioned: [Pg.269]    [Pg.342]    [Pg.234]    [Pg.269]    [Pg.342]    [Pg.234]    [Pg.439]    [Pg.24]    [Pg.991]    [Pg.424]    [Pg.203]    [Pg.88]    [Pg.403]    [Pg.1]    [Pg.426]    [Pg.21]    [Pg.24]    [Pg.46]    [Pg.122]    [Pg.99]    [Pg.78]    [Pg.551]    [Pg.116]    [Pg.102]    [Pg.151]    [Pg.294]    [Pg.531]    [Pg.637]    [Pg.654]    [Pg.201]    [Pg.119]    [Pg.37]    [Pg.211]    [Pg.256]    [Pg.4]    [Pg.42]    [Pg.284]    [Pg.728]   


SEARCH



PROMISE

© 2024 chempedia.info