Boron trifluorate

Electrochemical oxidation has also been reported to result in good yields of tetrazolium salts.97,98 Treatment of formazans with boron trifluor-... 

Friedel-Crafts reaction of isopropylbenzene and 2-methylpropenal diacetate (methacrolein diacetate) in the presence of titanium tetrachloride/boron trifluor-ide etherate gives cyclamenaldehyde enolacetate, which is hydrolyzed to the aldehyde [151] ... 

When halogen atoms are present in the epoxide such as in epichlorohydrin, 3,3,3-trichloropropylene oxide (TCPO) or 4,4,4-trichloro-l,2-butylene oxide (TCBO), or in the initiator, acid catalysts, e.g. boron trifluor-ide etherate, may be used (13-18). Vogt cind Davis (16) found that, if the concentration of catalyst/ini-tiator (polyol) complex is decreased with respect to TCPO in order to obtain higher molecular weight products, side reactions such as cyclization reactions become increasingly important. Boron trifluoride also promotes dimerization of alkylene oxides to dioxane or alkyl derivatives of dioxane as described by Fife and Roberts ( ). The use of acid catalysts, e.g. Lewis acids, promotes formation of a greater amount of terminal primary alcohol groups when compared to base catalysis of epoxides. 

The mixture was cooled to —78°C in a dry ice-acetone bath and trifluor-oacetic acid (7.4 mL, 95 mmol), boron trifluoride etherate (12.1 mL, 95 mmol) and freshly distilled cyclopentadiene (6.2 g, 95 mmol) were added in that order over a 20 minute period. The mixture was stirred at —78°C for 5 hours before it was allowed to warm to room temperature. 

A chemically unreactive, but friction sensitive explosive, caesium dodecakis(trifluor-omethyl)carba-cfoso-dodecaborate was prepared. Explosive products have also resulted from attempts to prepare the corresponding dicarbododecaborane. The explosion reaction appears to involve formation of boron trifluoride and graphite, and may therefore be more general. 

Fluorine-containing 1,3-dithiolanes can be prepared by the reaction of trifluor-omethylketones or trifluoroacetoaldehyde with ethanedithiole in the presence of boron trifluoride. ... 

The treatment of 125 ( = 1) with CI2 orMel leads to compounds 126 and 127 in decent yields and the alkylation of 125 ( = 2) with fluorinated alkyl trifluor-osulfonates results in the formation of amines 128 (Fig. 9.38). Isomeric azadienes 129 and 130 both produce stable unsaturated azaanion 131 upon treatment with CsF in polar media. The reaction of 129 with Mel leads to the formation of unsaturated heterocycle 132 and the treatment with boron trifluoride results in the mixture of dienes 129 and 130 " (Fig. 9.39). 

Xu J, Luo D-F, Xiao B, Liu Z-J, Gong T-J, Fu Y, Liu L (2011) Copper-catalyzed trifluor-omethylation of aryl boronic acids using a CF3 reagent. Chem Commim 47 4300-4302... 

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