Boron tnfluoride

Vinyl-type addition polymerization can also be carried out with acidic catalysis such as boron tnfluoride or tin tetrachloride and with basic catalysis such as alkali melals or alkali alkyls. An example of the first ease is the low-temperature polymerization of isobutene, which gives Vistanex" and butyl rubber an example of the second type is the polymerization of butadiene with sodium, which leads to buna rubber. 

Funaoka M, Abe I (1982c) The reaction of lignm under the presence of phenol and boron tnfluoride VII The cleavage of C-C linkage by disproportionation Mokuzai Gakkaishi 28 563-569... 

For an acid to be a proton donor, it must contain hydrogen. This led G. N. Lewis (1938) to develop a more general concept of an acid as an electron acceptor, the unshared electron pair of the base forming a covalent link with it. Thus described, boron tnfluoride is an acid ... 

Enoi acetylation (1, 1174-1178). As a first step in the synthesis of 3-n-butyl-2,4-pentanedione,1 a mixture of 28.6 g. (0.25 mole) of 2-heptanone, 51.0 g. (0.50 mole) of acetic anhydride, and 1.9 g. (0.01 mole) of p-toluenesulfonic acid monohydrate contained in a stoppered 500-ml. round-bottomed flask equipped with a magnetic stirrer is stirred at room temperature for 30 min. Then 55 g. (0.43 mole) of the 1 1 boron tnfluoride-acetic acid complex [Reagents, 1, 69 (1967)] is added some heat is evolved... 

Anisote (Methyl Phenyl Ether). Boron Tnfluoride - 302 150 - E - E anhydrous. 32 days... 

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