Iodine-Potassium iodide

The filtrate was adjusted to a pH of 9 by adding concentrated ammonia, and than a 1 N aqueous iodine-potassium iodide solution was added dropwise, whereby the tetrahydro-pyrimido-[5,4-d] pyrimidine obtained by hydrogenation with zinc in formic acid was converted by oxidation into 2,6-bis-(diethanolamino)-8-piperidino-pyrimido-[5/4-d]-pyrimidine. The completion of the oxidation was checked by means of a starch solution. The major amount of the oxidation product already separated out as a deep yellow crystalline precipitate during the addition of the iodine solution. After the oxidation reaction was complete, the reaction mixture was allowed to stand for a short period of time, and than the precipitate was separated by vacuum filtration, washed with water and dried. It had a malting point of 157°C to 158°C. The yield was 8.0 g, which corresponds to 95% theory. 

Iodine-potassium iodide solution. Dissolve 0.25 g iodine in a small volume of water containing 0.4 g potassium iodide, and dilute to 100 mL. 

Cucumber cotyledons were inoculated with purified tobacco mosaic virus (TMV) 20 to 24 hours before vacuum infiltration with different concentrations of crude water extracts of plant leaves (4). After 7 days, inoculated leaves were harvested and stored 24 hours in the dark in a moist chamber to remove excess starch. Starch lesions were counted after clearing with alcohol and staining with an iodine-potassium iodide-lactic acid mixture. The inhibitory effects of various extracts were demonstrated by comparing lesion counts of treated cotyledons to counts on control cotyledons. 

Sodium Hydroxide-Iodine/ Potassium Iodide/ Sodium Azide-Stan li... 

Iodine-Potassium Iodide Solution, Acidic Reagent... 

Iodine-Potassium Iodide Solution-Sodium Azide-Starch Reagent 303... 

Size polymers on polyester can be determined by staining tests with Cl Basic Red 22, Cl Reactive Red 12, iodine/potassium iodide solution, or a mixed indicator. The extraction of size components and their determination in solution using a variety of reagents to give a characteristic coloration or a coloured precipitate has been described. Methods using fluorescence spectroscopy with a fluorescent cationic dye (e.g. Pinacryptol Yellow or Cl Basic Orange 14) were also described. 

A UK standard official method [62] has been published for the spectropho-tometric determination of arsenic in sea water. The determination is effected by conversion to arsine using sodium borohydride which is added slowly to the acidified samples by a peristaltic pump. The liberated arsine is trapped in an iodine/potassium iodide solution and the resultant arsenate determined spectrophotometically as the arsenomolybdenum blue complex at 866 nm. The method is applicable down to 0.19 p,g arsenic. 

Gram Stain A staining procedure used in classifying bacteria. A bacterial smear on a slide is stained with a purple basic triphenyl methane dye, usually crystal violet, in the presence of iodine/potassium iodide. The cells are then rinsed with alcohol or other solvent, and then counter-stained, usually with safranin. The bacteria then appear purple or red according to their ability to keep the purple stain when rinsed with alcohol. This property is related to the composition of the bacterial cell wall. 

The same authors reported in a later study <2000H(3)69> that pyrazinone 340 is also a suitable starting material for a such transformation. The reaction proceeds in two steps the starting pyrazinone 340 when treated with benzonitrile oxide yields an addition product 341 which undergoes oxidative cyclization in the presence of iodine-potassium iodide to the ring-closed [l,2,4]oxadiazolo[4,5-tf]pyrazines 342. 

The conversion of the iodide 1481 to the olefin 1482 was achieved by a conventional four-step sequence. Treatment of 1482 with iodine, potassium iodide. 

Native urine should be protected from light and stored at -20°C until processed. Oxidized urine sample can be stored at room temperature, but light protection is still recommended. Two procedures for the oxidation of urine (and other samples) are used (1) oxidation with manganese dioxide (Mn02) under acidic conditions, and (2) oxidation with iodine (iodine/potassium iodide, I2/KI) under acidic and basic conditions. The Mn02 oxidation method is a routine method used to quantify total pterins (fully oxidized neopterin, monapterin, biopterin, primapterin, isoxanthopterin, and pterin) the I2/KI method is used according to Fukushima and Nixon [11] for the differential oxidation of pterins and quantification of BH4. Total biopterin represents the sum of BH4, BH2, and fully oxidized biopterin. Under acidic conditions BH4 and BH2 are oxidized to biopterin, while under basic conditions only BH2 is oxidized to... 

Freezing-point Curve Iodine-Potassium Iodide. 

Isoxazoles have been used to transpose functionality within a,/3-unsaturated carbonyl compounds (72JA9128). Thus, on exposing either (E)- or (Z)-/3-ionone oxime (449) to a mixture of iodine-potassium iodide in hot aqueous THF containing sodium bicarbonate, the isoxazole (450) was formed in high yield. Catalytic reduction of this isoxazole led... 

The iodination of substituted pyrroles can be carried out with iodine-potassium iodide, iodine-iodic acid or iodine and mercury(II) oxide. The tendency towards polyiodination is... 

Reaction of carbon disulfide with N,7V -dialkylethylenediamines, RNHCH2CH2NHR, gives -y-alkylaminodithiocarbamic acids 183, the zwitterions of which can be oxidized with iodine/potassium iodide in alkali to yield 1,2,5-thiadiazines 184 (R = Et, i-Pr, cyclohexyl) (49JOC946 50USP2514200 51USP2537633). 

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