By K. J. Ivin, J. C. Mol
This publication is a follow-up to Ivins Olefin Metathesis, (Academic Press, 1983). Bringing the traditional textual content within the box brand new, this moment version is as a result of the speedy progress within the box, sparked by means of the invention of various well-defined steel carbene complexes which may act as very effective initiators of every kind of olefin metathesis response, together with ring-closing metathesis of acyclic dienes, enynes, and dienynes; ring-opening metathesis polymerizationof cycloalkenes, acyclic diene metathesis polymerization; and polymerization of alkynes, in addition to basic olefin metathesis. Olefin Metathesis and Metathesis Polymerization offers a huge, up to date account of the topic from its beginnings in 1957 to the most recent purposes in natural synthesis. The ebook follows a similar structure because the unique, making it worthy toteachers and to researchers, and should be of specific curiosity to these operating within the fields of natural chemistry, polymer chemistry, organometallic chemistry, catalysis, fabrics technological know-how and chemical engineering. Key positive aspects* Discusses various periods of olefin metathesis and the alternative of response stipulations and catalyst* Considers advertisement strategies with examples from current and new applied sciences* offers a whole evaluation of the topic from its starting to the current day
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Extra resources for Olefin Metathesis and Metathesis Polymerization, Second Edition
1994b). They can be even more active for the metathesis of pent-2-ene when brought on to a support (Verpoort 1996a,b). Tungsten(VI) carbyne complexes exhibit varying degrees of metathesis activity, depending on the ligands. For instance, W(-CCMe3)(C1)3(dme) catalyzes the metathesis of linear and cyclic olefins at 20~ (Weiss 1986a, 1988c), whereas W(-CCMe3)(OCMe3)3 only becomes active for the metathesis of oct-l-ene in hexane at 69~ after reaction with SiO2. The carbyne complex is presumed to react with the weakly Br6nsted-acidic Si-OH protons, resulting in a Schrock-type tungsten carbene complex (Weiss 1989b,c); reaction (23).
The product of reaction (13) can be equilibrated with trans-3-methylbut-l-ene-dl at 25~ without loss of stereoselectivity over 50 h; reaction (14). No cyclopropanes are produced in any of the above reactions. C/ + CH2=CHCMe3 H "D (14) cyclopropane; in its absence the products are the homologues shown in reactions (15) and (16) (Webbe 1978). B. 1982), alk-2-enes and alkadienes (poor yields) (Straus 1985). The titanacyclobutane 19, formed by reaction of 17 with norbornene at 20~ eqn. (17), initiates the ROMP of further norbornene when the temperature is raised to 65~ The polymer formed has a narrow molecular 17 + / ~ amineb a s e i 9 CP2T ~ (17) (19) weight distribution (MWD); this reaction was the first well-documented example of 'living' ROMP (Gilliom 1986b).
The role of the support is seldom passive. In many cases there are indications of chemical interaction between the support and transition metal compounds, so it is always necessary to quote the support in defining the overall catalyst system. 1 Possible routes to metal carbene initiating species in olefin metathesis. typically more than 200 m 2 g-1 while the catalyst content is generally 1-20% by weight. Chemically bound polymer-supported complexes have been tested for use with solutions of olefins.