White Label

The DOT ha2ard classification of formic acid is "corrosive material." A DOT white label is mandatory for transportation. The EC classification is "corrosive."... 

The ethyl cyanoacetate and methyl ethyl ketone were Eastman Kodak Company white label grade chemicals and were used without further purification. Commercial absolute ethanol was found to give a slightly better yield of the ammonium salt of the imide. 

The trifluoroacetic acid and veratrole used were Eastman Kodak Company white label grade. 

A purified fatty acid is recommended for the preparation of a pure a-sulfo acid. Purified palmitic acid (m.p. 60.8-61.4°, neutralization equivalent 256.2) is prepared by twice recrystallizing a good commercial grade of palmitic acid from acetone at 0°, using a solvent ratio of 10 ml. to 1 g. However, the reaction may be applied to commercial saturated higher fatty acids, if the iodine number is sufficiently low. The checkers obtained similar results with recrystaUized Neo-Fat 1-56 (Armour and Company, Chicago, 111.) or Eastman white label palmitic acid. 

Eastman Kodak white label 2,4-dinitrochlorobenzene, which had a light tan color, was used without further purification. 

Eastman Organic Chemicals, white label grade, used without purification. 

Eastman Kodak Co. white label triphenylphosphine and Matheson Co. methyl bromide were used. Triphenylphosphine is available from the Metal and Thermit Corp., Rahway, New Jersey. 

Eastman Kodak white label w-nitrobenzencsulfonyl chloride was used. 

Hydantoin can be prepared in a variety of ways, notably from glycine2 or ethyl aminoacetate8 and potassium cyanate. The checkers used Eastman Kodak white label hydantoin. 

Eastman Kodak white label material, melting at 71.5-73.5°, was used. 

Eastman Kodak white label, Dow Chemical, and Kay-Fries ethyl cyanoacetate were all used with equal success. 

A good grade of commercial diethylamine hydrochloride (Eastman Kodak white label or Matheson, Coleman and Bell) is satisfactory without purification. 

Diethyl malonate as supplied by the Eastman Kodak Company (white label grade) or by Abbott Laboratories may be used without further purification. 

The ethyl a-bromobutyrate employed was redistilled Eastman Kodak white label material, b.p. 64°/15 mm., 1.4479. Technical DMF (du Pont) was used, and the sodium nitrite was an analytical grade. 

Eastman s white label a-naphthol or equivalent is the most satisfactory starting material. Technical-grade a-naphthol may be used, but it gives an inferior product that is difficult to purify. 

Eastman Organic Chemicals white label 2,2-oxydiethanol was used. 

Eastman white label sulfanilic acid was used without purification. 

Eastman Kodak Company white label grade of phenylacetyl chloride was used, but equally good results are obtained with the crude acid chloride obtained by treating phenylacetic acid with an excess of thionyl chloride and removing the latter under reduced pressure. 

Eastman s white label grade phenyl disulfide is suitable. 

Eastman white label triethylamine is distilled from sodium hydroxide. 

Fig. 9.9 SEM micrograph of an n-type silicon electrode with an etched macropore array (5 2 cm, (100), 3 V, 350 min, 2.5% HF). Pore growth was induced by a square pattern of pits produced by standard lithography and subsequent alkaline etching (inset upper right). In order to measure the depth dependence of the growth rate, the current density was periodically kept at 5 mA cm 2 for 45 min and then reduced to 3.3 mA crrf2 for 5 min. This results in a periodic decrease in the pore diameter, as indicated by the white labels on the left-hand side. After [Le9].

Eastman Kodak white label reactants are satisfactory. The benzaldehyde should be freshly distilled before use. 

Eastman Kodak white label cyclohexanone was used without further purification. 

N,N-Dimethylformamide is distilled from calcium hydride at 71° (32 mm.) and stored under argon. The checkers used a freshly opened bottle of the product (white label grade) available from Eastman Organic Chemicals. 

Bromobenzene was used as supplied by Aldrich Chemical Company, Inc. Purification by distillation under argon did not change the yield of methallylbenzene. The checkers used the product available from Eastman Organic Chemicals (white label). 

Eastman Kodak Company white label isocaproyl chloride was redistilled and the middle 80% portion was used. 

The submitters used Eastman Kodak Company white label thionyl chloride. The checkers purified commercial thionyl chloride (Hooker Electrochemical Company, refined grade) by the method of Cottle.3... 

The checkers used Eastman Kodak Company white label ethyl acetoacetate as received. 

Phenanthrene purified by the sodium treatment was found superior to that from the azeotropic distillation, but both products gave satisfactory results. A good grade of commercially available phenanthrene ( white label grade supplied by the Eastman Kodak Company), although recrystallized and treated with Raney nickel, resisted hydrogenation under the described conditions. 

Good-quality enanthaldehyde such as the white label grade supplied by the Eastman Kodak Company was distilled before use. It is best stored in a brown bottle under nitrogen for protection against oxidation. 

---