Acetic acid complexes

Coumarone—Indene Kesins. These should be called polyindene resins (17) (see Hydrocarbon resins). They are derived from a close-cut fraction of a coke-oven naphtha free of tar acids and bases. This feedstock, distilling between 178 and 190°C and containing a minimum of 30% indene, is warmed to 35°C and polymeri2ed by a dding 0.7—0.8% of the phenol or acetic acid complex of boron trifluoride as catalyst. With the phenol complex, tar acids need not be completely removed and the yield is better. The reaction is exothermic and the temperature is kept below 120°C. When the reaction is complete, the catalyst is decomposed by using a hot concentrated solution of sodium carbonate. Unreacted naphtha is removed, first with Hve steam and then by vacuum distillation to leave an amber-colored resin. It is poured into trays, allowed to cool, and broken up for sale. 

A solution of 3 g of the nitrile, water (5 moles per mole of nitrile), and 20 g of boron trifluoride-acetic acid complex is heated (mantle or oil bath) at 115-120° for 10 minutes. The solution is cooled in an ice bath with stirring and is carefully made alkaline by the slow addition of 6 A sodium hydroxide (about 100 ml). The mixture is then extracted three times with 100-ml portions of 1 1 ether-ethyl acetate, the extracts are dried over anhydrous sodium sulfate, and the solvent is evaporated on a rotary evaporator to yield the desired amide. The product may be recrystallized from water or aqueous methanol. Examples are given in Table 7.1. 

Boron trifluoride-acetic acid complex Harshaw Chemical Co., Allied Chemical Co. 1,5-Cyclooctadiene A, MCB Sulfur dichloride MCB Boron trifluoride etherate EK, MCB Mercuric acetate MCB Norbornene MCB Calcium carbide MCB Pinacol EK, MCB... 

IA solution of the allylsilane (2 mmol) in chloroform (2 ml) was added all at lonce to boron trifluoride-acetic acid complex (2.2 mmol) with vigorous Ishaking until a single phase resulted. After 5 min, the solution was poured linto saturated sodium hydrogen carbonate solution (10ml) and extracted... 

Reaction of isothiocyanates with resorcinol derivatives in the presence of boron trifluoride-acetic acid complex for overnight at 0-5 °C affords the corresponding thioamides.25... 

Dienes can be obtained from silylallenes by protodesilylation using boron trifluo-ride-acetic acid complex (equation 29)62. Since silylallenes can be obtained by the reaction of propargyl acetate with cuprous reagent derived from chloromethyltrimethylsilane, this reaction sequence constitutes conversion of propargylic acetate to butadiene through one carbon homologation. 

Ring cleavage of the bicyclic dihydro-oxazolo [3,4-c]oxazol-3-one 111 derived from D-serine was realized by action of boron trifluoride-acetic acid complex leading to the oxazolidinone 112, a useful building block for the synthesis of... 

Boron Trifluoride-Acetic Acid Complexes. BF3.CH3COOH... 

EDTA ethylene-diamine-tetra-acetic-acid (complexing agent)... 

Vanadium(n) Complexes.—Dehydration of VSO. THjO has been shown to proceed via the formation of VS04,mH20 (where n = 6, 4, or 1) and V(OH)-(SO4), which were characterized by X-ray studies. The polarographic behaviour and the oxidation potential of the V -l,2-cyclohexanediamine-tetra-acetic acid complex, at pH 6—12, have been determined.Formation constants and electronic spectra have been reported for the [Vlphen),] " and [V20(phen)] complexes. The absorption spectrum of V ions doped in cadmium telluride has been presented and interpreted on a crystal-field model. The unpaired spin density in fluorine 2pit-orbitals of [VF ] , arising from covalent transfer and overlap with vanadium orbitals, has been determined by ENDOR spectroscopy and interpreted using a covalent model. " ... 

The kinetics of the reaction between [V(salen)] in pyridine and oxygen have been determined and interpreted in terms of the formation of a [V(salen)] -oxygen adduct. This reinforces the view that vanadium(iii) complexes can act as oxygen carriers. The oxidation of the 1,2-cyclohexanediaminetetra-acetic acid complex of V " has been studied in solutions of pH 6—12. ... 

A mixture of 28.6 g. (0.25 mole) of 2-heptanone (Note 1), 51.0 g. (0.50 mole) of acetic anhydride (Note 2), and 1.9 g. (0.01 mole) of p-toluenesulfonic acid monohydrate (Note 3) contained in a stoppered 500-ml. round-bottomed flask equipped with a magnetic stirrer is stirred at room temperature for 30 minutes. Then 55 g. (0.43 mole) of the solid 1 1 boron trifluoride-acetic acid complex (Note 4) is added some heat is evolved during this addition. The resulting amber-colored solution is stirred in the stoppered flask at room temperature for 16-20 hours (Note 5), and then a solution of 136 g. (1.00 mole) of sodium acetate trihydrate (Note 6) in 250 ml. of water is added. After the flask has been fitted with a reflux condenser, the reaction mixture is heated at reflux for 3 hours and then cooled,... 

The submitters employed 75 g. (0.5 mole) of the liquid 1 2 boron trifluoride-acetic acid complex obtained from Harshaw Chemical Company. Since the checkers were unable to obtain this complex from a commercial source, they prepared the solid 1 1 complex following published directions.3 4 A 2-1. threenecked flask is fitted with a mechanical stirrer, a gas outlet tube, and a gas inlet tube extending to the bottom of the flask. A solution of 230 ml. of acetic acid in 750 ml. of 1,2-dichloro-ethane is added to the flask and a stream of boron trifluoride gas is passed through the reaction flask while the solution is stirred and cooled with an ice bath. After approximately 1 hour, when the mixture is saturated, the addition of boron trifluoride is stopped and the insoluble 1 1 boron trifluoride-acetic acid complex is rapidly collected on a filter, washed with 200 ml. of... 

Allylsilanes undergo protodesilylation in high yield with the BFj acetic, acid complex at 20° in 5 minutes. 

BMG750 CAS 7578-36-1 HR 3 BORON TRIFLUORIDE-ACETIC ACID COMPLEX... 

Inorganic Syntheses, Volume XVIII Edited by Bodie E. Douglas Copyright 1978 by Jolni Wiley Sons, Inc. Ethylene(iiamine-N,N -Di acetic Acid Complexes ofCobalt(III) 103... 

The concentration of acetic acid in the fog fraction is essentially identical with the concentration at the maximum boiling point as only the molecules of the TEA/acetic acid complex undergo condensation. 

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