Color solid

The cream-colored solid is separated at once by filtration and washed thoroughly with water to remove excess bromine water and acids. It is used in the next step without drying. The melting range of the crude product is usually 170-172°. 

Preparation of Ethyl a-Acetylamino-a-Carbethoxy-0-f5-Benzyloxy-lndolyl-3l-Propionate 4-benzyloxyphenylhydrazine hydrochloride was converted to the corresponding base 2 to 3 hours before use 28 grams of the hydrochloride was suspended in 500 ml chloroform and shaken with 55 ml 2 N sodium hydroxide in 100 ml water. The chloroform was separated and the aqueous phase reextracted with chloroform (2 x 100 ml). After washing with 100 ml water, the chloroform Solution was dried over sodium sulfate, filtered and evaporated at 30° to 35°C, leaving 4-benzyloxyphenylhydrazlne as a friable buff-colored solid (23 grams, 97% from hydrochloride). 

The dark-colored residue is divided into two approximately equal portions, and each is poured, while still hot, into a 4-I. beaker. After the liquid has cooled to about 70°, 1650 cc. of acetone is added to each portion. The mixture is stirred well, so that as much as possible of the dark-colored solid is brought into contact with the acetone. After standing in the ice box overnight, the jS-bromoethylamine hydrobromide is collected on a filter, washed with acetone until colorless (Note 3), and air-dried... 

Endosulfan is sold as a mixture of two different forms of the same chemical (referred to as a- and P-endosulfan). It is a cream- to brown-colored solid that may appear crystalline or in flakes. It has a distinct odor similar to turpentine. Endosulfan does not bum. 

According to EU purity criteria, color intensity is defined as the absorbance of a 0.1% (w/v) solution of caramel color solids in water in a 1 cm cell at 610 nm. The color intensity must be 0.01 to 0.12 for class I (E 150a), 0.05 to 0.13 for class II (E 150b), 0.08 to 0.36 for class III (E 150c), and 0.10 to 0.60 for class IV (E 150d). Ammonia caramels show the highest tinctorial power and are most commonly used as food colorants. Class I has the weakest coloring properties and is mostly used as flavor. 

Three attributes characterize color hue, lighmess (or value), and saturation (or chroma) and they are graphically represented in color solids (e.g., Munsell solid. Hunter solid). The Munsell Color Notation is a rapid, portable, widespread, and economical system of color determination. However, as it depends on sensory evaluation by panels, many laboratories prefer when possible to replace human judgment by instrumental techniques that are easier to handle. The CIELAB established by the Commission International d Eclairage (CIE) has become widely used with the availability of reflectance spectrophotometric instrumentation. 

Synthetic Method 1 6-(dimethylamino)-3-(N-acetyl-N-methylamino)-10-acetylphenothiazine 8a (procedure from US. Patent 4,652,643).5 A mixture of 9.0g of 6-(dimethylamino)-3-(methylamino)phenothiazin-5-ium chloride (Azure B), 150.0ml of acetic anhydride, and lO.Og of zinc dust was maintained at reflux temperature for approximately 4 hs. After the reaction mixture was cooled to ambient temperature, it was poured into ice water with stirring and 300ml of toluene was added. After stirring for approximately 30 min the toluene layer was separated and washed twice, once with tap water and once with saturated aqueous sodium chloride solution. The toluene was then distilled off at reduced pressure. The residue which remained was dissolved in ethyl acetate and separated into various components by subjecting the solution to column chromatography using silica gel as substrate. Elution with ethyl acetate yielded a white-colored solid. 

Square-planar ds platinum complexes could perhaps be used as the chemically sensitive layer for a chemical sensor system. These complexes are robust and form colored solid-state materials that respond spectroscopically to a wide range of volatile organic compounds (VOCs) this process has been named vapochromism. The vapochromic shifts occur in the solid-state UV-vis,... 

Because of the low oxidation state of the metal [M(II)] in the group 4B metallocene dicarbonyl compounds, all of them, perhaps with the exception of (17—C5Me5)2Ti(CO)2 (27), are very air sensitive and decompose rapidly on exposure to air, forming a yellow solid for the titanium compounds and cream-colored solids for the zirconium and hafnium analogs. While the dicarbonyl 27 is indeed air sensitive, its decomposition appears qualitatively to be much slower relative to the other related complexes. 

Radialenes which are structurally related to 44, i.e. cyclopropanes bearing two quinoid and another acceptor-substituted methylene substituent, were obtained by condensation of bis(4-hydroxyphenyl)cyclopropenones with active methylene compounds, followed by oxidation (Scheme 6)19. Radialenes 45a-f are brilliantly colored solids that are blue or blue-violet in solution but appear metallic gold or red in reflected light. Instead... 

Black-body radiation is the radiation emitted by a black-colored solid material, a so-called black body, that absorbs and also emits radiation of all wavelengths. A black body emits a continuous spectrum of radiation, the intensity of which is dependent on its wavelength and on the temperature of the black body. Though a black body is an idealized system, a real solid body that absorbs and emits radiation of aU wavelengths is similar to a black body. The radiation intensity of a black body, at... 

C. N-Hydroxy-4-(p-chlorophenyl)thiazole-2(3H)-thione. O-Ethyl S-[2-oximino-2-(p-chlorophenyl)ethyl]dithiocarbonate (56.0 g, 0.19 mol) is placed in a 500-mL round-bottomed flask that is equipped with a magnetic stir bar. Diethyl ether (120 mL) is added and the slurry is treated at 0°C in small portions with solid anhydrous zinc chloride, ZnClj, 79.1 g, 0.58 mol) at such a rate that the solvent does not boil constantly (Note 8). After the addition is complete, the flask is stoppered with a drying tube (CaCl2) and stirring is continued for 48 hr at 20°C. The reaction mixture turns into a dear, dark brown solution that solidifies toward the end of the reaction. The flask is immersed in an ice bath and treated dropwise with 5.5 M hydrochloric add (140 mL, Note 9). The precipitate dissolves immediately. Stirring is continued for 30 min at 0°C whereupon a tan-colored solid separates. This material is collected by filtration. It is washed with small portions of diethyl ether (total of 110 mL) and dried to afford 39.8 g (86%) of N-hydroxy-4-(p-chlorophenyl)thiazole-2(3H)-thione (Note 10). The crude material is transferred to a 2-L, round-bottomed flask equipped with a reflux condenser. 2-Propanol (760 mL) is added and the reaction mixture is heated to reflux. Once a dear solution is obtained the heat source is immediately removed (Note 11). The solution is allowed to cool to room temperature. Precipitation of N-hydroxy-4-(p-chlorophenyl)thiazole-2(3H)-thione is completed by immersing the flask for 30 min in an acetone-dry ice bath (-78°C). The product is collected by filtration and dried to afford 21.9 g (53.5%) of N-hydroxy-4-(p-chlorophenyl)thiazole-2(3H)-thione as tan crystals (Notes 12,13). 

The product is a very pale yellow to cream-colored solid. It is hygroscopic and is soluble in liquid ammonia, with limited solubility and stability in acetonitrile, dimethyl sulfoxide, and dimethylformamide. Water or moisture from the air leads to disproportionation, and so the product must be stored under anhydrous... 

This compound is the only one known for these elements in this oxidation state it is obtained as a highly-colored solid by the high-temperature reaction between fluorine and the metal. The solid is isostructural with the hexafluorides of osmium and iridium, and the Pt-F distance has been estimated at 1 83 A by extrapolation along the series W-Os-Ir 255). The infrared spectrum has been assigned in Oh symmetry 256) there are no signs of any distortion, as found for example in osmium hexafluoride. 

It is necessary to flame the column and side arm. The product obtained in this way is a light-yellow or cream-colored solid which need not be recrystallized unless a colorless sample is dc-... 

A reactor charged with oxahc acid dichloride (5.20 mol) dissolved in 1600 ml toluene and diphenylamine (4.72 mol) dissolved in 1200 ml toluene was heated for 1.5 hours at 45°C. The cyclization was carried using anhydrous aluminum chloride (15 g) and refluxing for 3 hours. The mixture was precipitated in water and the crude product isolated and washed three times with distilled water and then dried. The product was isolated in 92.7% yield as an orange-colored solid having an mp of 138°C with a GC purity of 98.7%. 

A flask charged with A-carboxyanhydrides of tyrosine (14.5 mmol), alanine (72.1 mmol), y-methoxyglutamate (22.2 mmol), and e-A-Boc-lysine (51.5 mmol) were treated with 583.3 ml of dioxane and then stirred for 30 minutes and treated with 116 jlL of diethyl amine. Within the first hour the mixture became viscous and very cloudy. After 24 hours the mixture was quenched by pouring into a second flask containing 1.58 liter of water and awhile colored solid collected. The precipitate was dried by vacuum filtration and washed six times with 250 ml of water and then dried overnight and the product isolated. 

The step 2 product (22 g) was treated with 177.2 ml of 33% of HBr in acetic acid and stirred at 20°C for 20-30 hours. The reaction mixture was then dialyzed and lyophilized to obtain the product as a white to off-white colored solid. 

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