Organometallic coupling agents

In some examples it is not necessary to prepare the organometallic-coupling agent R2MX2 beforehand. Thus coating glass fibres with a heptane or alcohol solution of titanium alkoxide promotes adhesion between the fibre and polymer, e.g., acrylic, polyolefins, polyester, polyamide and other thermoplastic resins. 

Ken-React [Kenrich], TM for a series of organometallic coupling agents based on titanium, zirconium, and aluminum. 

Podvorica, F. I. Non-diazonium organic and organometallic coupling agents for surface modification, in M. M. Chehimi, (Ed.), Aryl Diazonium Salts. New Coupling Agents in Polymer and Surface Science. Wiley-VCH, Weinheim, 2012. 

Use of organometallic coupling agents (additives) as process aids, adhesion promoters, and physical property enhancers in a wide va-... 

In summary, the development in the field of total syntheses of the antitumor agent camptothecin nicely illustrates the progress of modern synthesis over the last decade. Radical reactions and organometallic coupling reactions, for example, have reached such a level of maturity that they now belong to the standard repertoire of key steps in the construction of complex molecules. 

The first organometallic miktoarm star copolymer, PFS(PI)3, with PDI of 1.04 was synthesized through an anionic polymerization by using SiCl4 as a coupling agent, as shown in Scheme 3.11.32 The well-defined structure was confirmed by the characterizations of GPC and H nuclear magnetic resonance (NMR) spectroscopy. The PFS(PI)3 miktoarm star copolymer was obtained in a moderate yield after size-exclusion column purification (Mn = 21,300 PDI = 1.05) and with a composition ratio of PFS PI = 1 9.5. 

Our group published the first organometallic derivatives of PNA monomers [138]. Ferrocene carboxylic acid 3 and benzoic acid chromium tricarbonyl 50 were coupled to the amino group of PNA monomers with different nucleobases (Thymine (T) a and Z-protected Cytosine (Z-C) b) using HBTU as the coupling agent to give compounds 51 and 52, respectively (Scheme 5.27). The activation barrier AG for the rotation about the tertiary amide bond has been determined for the ferrocenylated T-PNA monomer 51a to be 75 0.5 kj moD. For the same compound 51a, a T-T self-association constant = 2.5 0.2 has been... 

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