Harshaw Chemical

Glass Frosting and Polishing Technical Service Bulletin 667, Harshaw Chemical Co., Solon, Ohio. 

Boron trifluoride [7637-07-2] (trifluoroborane), BF, was first reported in 1809 by Gay-Lussac and Thenard (1) who prepared it by the reaction of boric acid and fluorspar at duU red heat. It is a colorless gas when dry, but fumes in the presence of moisture yielding a dense white smoke of irritating, pungent odor. It is widely used as an acid catalyst (2) for many types of organic reactions, especially for the production of polymer and petroleum (qv) products. The gas was first produced commercially in 1936 by the Harshaw Chemical Co. (see also Boron COMPOUNDS). 

A commercial catalyst was employed by the submitters Harshaw Chemical Company, CU-0202P 556-002. 

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... 

Epitaxial crystallization was accomplished by the immersion of a preheated substrate (the substrates for epitaxial crystallization were single crystals of alkali halides from Harshaw Chemical Co.) into the monomer solution followed by its in-situ cleavage to expose two fresh (100) surfaces. 

A technical grade of silver difluoride (approximately 85%) is available from Harshaw Chemical Company. Better grades of silver difluoride are available and may be employed. It is important that the silver difluoride be a black powder. If the material is light brown and lumpy, a lower yield of product may be obtained. Normally, the contents of a 1-lb. can (approximately 435-470 g.) are employed. 

Harshaw Chemical Co., a division of Kewanee, was able to grow a 17-in. crystal for ionization detection, which no one else had done. Harshaw considered the processes involved to be a trade secret. Several former employees of Harshaw formed or later joined Bicron Co. These employees had signed at least one agreement with Harshaw not to disclose confidential information or trade secrets. Bicron was formed to produce crystals. 

Catalysts A, prepared from aluminum isopropoxide and calcined at 700° for 4 hours A—Na, contained 1 % by weight of sodium by impregnation with sodium carbonate A—H, purchased from Harshaw Chemical Company it contained 0.35% of sodium. HLSV = hourly liquid space velocity, grams of alcohol per gram of catalyst per hour. 

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... 

Method A. To an alumina (Harshaw Chemical Co. 80 mesh alumina, slightly basic type used for chromatography is dried at 160°-170°C for 5 days before use) column (1.7 x 11 cm) is added a solution of 0.77 gm of l-(p-bi-phenyl)-3-phenyl-l-propyne in n-pentane. After 45 min the product is eluted with -pentane and concentrated at room temperature using a nitrogen atmosphere (with a water aspirator) to afford 0.53 gm (69%), m.p. 84.8°-86.4°C. 

The submitters obtained anhydrous HF from Harshaw Chemical Company, and the checkers purchased this reagent from Matheson Gas Products. 

Manufacturers and trade names of cadmium pigments include Cerdec AG, Frankfurt, Germany Orkem, Narbonne, France (Langdopec Pigments) J. M. Brown, Stoke-on-Trent, U.K. Cookson-Matthey, Kidsgrove, U.K. Ferro Corporation, Color Division, Cleveland, USA and Harshaw Chemical Co., Cleveland, USA. 

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