Dialdehyde chemistry

THE APPLICATION OF DIALDEHYDE CHEMISTRY FOR CONTROL OF CATALASE IN THE DEINKING PROCESSES... 

Reagents based on dialdehyde chemistry have been shown to be highly sensitive for fluorescence and/or electrochemical detection of amino acids. They are both fluorogenic and electrogenic that is, the compounds themselves are not fluorescent or electroactive but produce derivatives that exhibit both properties. The overall reaction scheme for these... 

Much of the chemistry of diols—compounds that bear two hydroxyl groups—is analo gous to that of alcohols Diols may be prepared for example from compounds that con tain two carbonyl groups using the same reducing agents employed m the preparation of alcohols The following example shows the conversion of a dialdehyde to a diol by... 

In the BASF synthesis, a Wittig reaction between two moles of phosphonium salt (vitamin A intermediate (24)) and C q dialdehyde (48) is the important synthetic step (9,28,29). Thermal isomerization affords all /ra/ j -P-carotene (Fig. 11). In an alternative preparation by Roche, vitamin A process streams can be used and in this scheme, retinol is carefully oxidized to retinal, and a second portion is converted to the C2Q phosphonium salt (49). These two halves are united using standard Wittig chemistry (8) (Fig. 12). 

Cell link is based on the chemistry of dialdehydes and their cross-linking reaction with amino-groups of the protein chains. 

Much of the chemistry of 1,3-dialdehydes, aldehyde ketones, and diketones already has been mentioned in this chapter and is well illustrated in the properties of 2,4-pentanedione,... 

This concept may also be extended to polynuclear helicates [38]. When 2-amino-quinoline and 4-chloroaniline were mixed with the phenanthroline dialdehyde shown in Scheme 1.10, a dynamic library of potential ligands was observed to form. The addition of copper(I) causes this library to collapse, generating only dicopper and tricopper helicates. As in the mononuclear case of Scheme 1.9, the driving force behind this selectivity appeared to be the formation of structures in which all ligand and metal valences are satisfied. The use of supramolecular (coordination) chemistry to drive the covalent reconfiguration of intraligand bonds thus... 

Mehltretter, C. L. (1964). Dialdehyde starch. Methods in Carbohydrate Chemistry, Vol. IV, p. 316. Academic Press, New York. 

A widely applied strategy for the synthesis of various difunctionalized organic molecules, e.g. diols, dialdehydes, etc., relies on the oxidative cleavage of olelinic double bonds. Besides transition metal catalysis for asymmetric synthesis, periodate oxidation and ozonolysis are the standard tools for oxidative bond cleaving reactions. For economic and safety reasons, technically applicable alternatives to osmium-based chemistry and ozonolysis are of great interest. 

Fig. 9 DCL of macrocyclic anion receptors (12-16) obtained by reversible imine chemistry between the dialdehyde 9 and diamines 10, 11...

The Mibs concept is, of course, not restricted to isocyanide-based MCRs. Wessjohann recently demonstrated that multiple Staudinger reaction is highly effective for the construction of marcocycles [110]. Thus, the reaction of diamine 83, dialdehyde 91 and acylchloride 92 in the presence of triethylamine afforded macrocycle 93 incorporating four p-lactam units in 82% yield. The c/s-stereo-chemistry of all the four-membered rings was established based on the coupling... 

Horner-Wadsworth-Emmons procedures are also commonplace in synthetic materials chemistry, recent examples including donor-acceptor substituted molecules with bicyclo-spacers, which require napthalene-, anthracene-, and pyrene-substituted phosphonates, (112), (113) and (114) respectively, well-defined, electroactive PPE/PPV copolymers through the condensation of dialdehydes and bisphosphonate (115), ° and triphenylamine-substituted PPV. ° ... 

Friedel-Crafts and Grignard processes applied to, 6, 251-289 halogen oxidation of simple, 3, 129-184 infrared spectra of, 12, 13-33 mechanisms of replacement reactions in chemistry of, 9, 1-57 metabolism of, 2, 119-160 3, 229-250 orthoesters of, 1, 77-127 periodate oxidation of, 11, 1-41 the dialdehydes" from, 16, 105-158 physicochemical properties of, 16,11-51 radiation chemistry of, 16, 13-58 and related compounds, paper chromatography of, 9, 303-353 relative reactivities of hydroxyl groups of, 8, 1-44... 

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