Metal route

The author hopes that the chapter has shown how the reactivity, and selectivity towards oxygen transfer reactions of hydrogen peroxide can be utilized for synthetic purposes. Generally, for laboratory and industrial application, activation of hydrogen peroxide by transition metal ions is the method of choice, although in a number of cases, the transition metal route can lead to disposal and environmental problems. The reaction of hydrogen peroxide with organic compounds can, therefore, provide a viable alternative to metal ion activation. 

After 1.2 F moF of electricity had been passed through either A1 or Mg anode, the symmetrical coupling of monochlorosilanes (65 mmol) led, as expected, to the symmetrical disilanes (Eq. 8) in yields comparable to those from the metal route (Table 2). 

Substrate Product Electrosynthesis Isolated Yield l%] Metal Route ... 

This chapter describes the preparation of a polymer that is curable to an elastomer and should be inexpensive to manufacture. Also described is a non-alkali-metal route to polysilanes. 

Rhein A Non-Alkali-Metal Route to Poly silanes... 

Azomethine ylide 1,3-dipoles generated through the N-metallation route are listed in Table VII. 

The chemistry of azomethine ylide 1,3-dipoles, especially that of acyclic azomethine ylides, has completely changed since 1978. Methods of generating azomethine ylides, which were seriously limited before then to the aziridine route (Section II,A) and the deprotonation route (Section II,D), have been much extended. New methods, such as the desilylation route (Section II,B), the tautomerization route (Section II,C), the decarboxylation route (Section II,E), the N-oxide route (Section II,F), and the N-metallation route (Section II,G), are now known and the types of azomethine ylides available have been widely expanded. 

Scheme 9 Synthesis routes of polyfluorenes with on-chain Pt(II) complexes by postpolymerization metalation (route 1) and copolymerization from Pt(II) metal complexes (route 2)... 

As we move from pericyclic reactions to other processes, we can consider a tandem metallation route to the same basic skeleton, that of ellipticine 205, the basis of some important drugs. The selectivity problem here is to relate the position of the two nitrogen atoms. 

J. Kerres, W. Cui, S. Reichle, New sulfonated engineering polymers via the metalation route. I. Sulfonated poly(ethersulfone) PSU Udel via metalation-sulfination-oxidation. Journal of Polymer Science Part A Polymer Chemistry 1996, 34(12), 2421-2438. 

From bis-silanol monomers, themselves prepared either via an organo-metallic route or via hydrosilylation of a,c -dienes. The bis-silanol monomers are then polymerized to give hybrid homopolymers or condensed with difunctional silanes to give copolymers (cf Scheme 2). 

Figure 15 Schematic diagram of the metallization route starting from the polymeric nanofibers fabricated using supramolecular assembly between PS-i>-P4VP and PDP (a) reduction and com-plexation of Pd ions with P4VP on Si-substrate (b) adsorption of CdSe nanoparticles on P4VP. (Reproduced from Ref. 60. Wiley-VCH, 2003.)...

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