Cream crystallized

Cyclopropyltriphenylphosphonium Bromide (5). The lactone salt is pyrolyzed by placing it in a round-bottom flask fitted with an adaptor attached to a vacuum source (aspirator is sufficient). The flask is heated (oil bath) to 180-190° for 48 hours. The residue is a virtual quantitative yield of the tan product, which may be crystallized from ethyl acetate giving cream crystals, mp 189-190°. An alternate setup is convenient if a drying pistol (Abderhalden) is available. The compound is placed in the pistol, which is then evacuated. Decalin (bp approx. 187°) is refluxed over the pistol to provide the heating source. The work-up is the same. 

Arbuckle has published some excellent work on microscopic studies of ice cream crystal structure and effects of hydrocolloids on this crystal structure. Some interesting examples of this work are shown in some of his papers 1,18). 

Colorless to pale cream crystals with a characteristic, choking odor. Moisture sensitive. Odor threshold concentration is 53 ppb (quoted, Amoore and Hautala, 1983). 

Most of the 2-amino-4H-pyrans are colorless, pale-yellow, or pale-cream crystals with high melting points. They are readily soluble in aromatic hydrocarbons, alcohols, acetone, acetonitrile, chloroform, DMF, and DMSO, and nearly insoluble in hexane and water. 

The product may be recrystallized from a toluene-hexane solvent mixture described as follows. However, NMR spectra of crude and recrystallized material are identical, so the recrystallization may not be needed for most purposes. The solid is dissolved in several increments of toluene (1 x 20 mL 2x3 mL) by warming to 40° C and the solution is evaporated under reduced pressure to approximately half-volume. Hexane ( 3 mL) is added until the solution becomes cloudy and the solution is then refrigerated overnight. The fine, pale cream crystals of the product are removed by filtration and dried in vacuo. A second crop can be collected by further evaporation of the filtrate and addition of hexane. Yield 0.28-0.32 g (47-62%). 

Ice-cream. Crystallization of lactose in ice-cream causes a sandy texture. In freshly hardened ice-cream, the equilibrium mixture of a- and /1-lactose is in the glass state and is stable as long as the temperature remains low and constant. During the freezing of ice-cream, the lactose solution passes through the labile zone so rapidly and at such a low temperature that limited lactose crystallization occurs. 

A mixture of ethyl 5-(2-formyl-3-benzyloxyphenoxy)pentanoate (3.61 g, 0.01 M), potassium hydroxide (1.19 g, 0.021 M) and ethanol (40 ml) were stirred at 50°-60°C for 5 hours. The ethanol was then removed in vacuum, the residue dissolved in water (50 ml) and the solution extracted with ether (2 x 80 ml). The aqueous layer was then acidified by the addition of 2 N aqueous hydrochloric acid and the product extracted with ether, and the combined extracts washed with water to neutrality, dried, and concentrated in vacuum to give 5-(2-formyl-3-benzyloxyphenoxy)pentanoic acid, 3.0 g, 91% as a yellow oil which crystallized on standing. The crude solid was crystallized from benzene/petroleum ether to give pale cream crystals, melting point 110°C. 

Lopez, C., Bourgaux, C., Bernadou, S., Keller, G., Ollivon, M. 2002a. Thermal and structural behavior of milk fat. 3. Influence of cooling rate and droplet size on cream crystallization. 

Properties Moist white to cream crystals. Mp 52-55C, bp 205-207C. Soluble in most organic solvents. 

Properties Cream crystals musty odor. D 1.718 (25/4C), mp 142-145C, bp 328C (some decomposition). Practically insoluble in water slightly soluble in alcohols somewhat soluble in carbon disulfide, benzene, chloroform. 

Properties Fine white to cream crystals. Mp 197-205C. Slightly soluble in water soluble in acetic acid and alcohol. 

Bufexamacum Bufexamic acid CP-1044 CP-1044-J3 Droxarol Droxaryl EINECS 219-451-1 Feximac Flogicid Flogocid N plasSgel J3 Malipuran Mofenar Norfemac Parfenac Parfenal. Anti-inflammatory analgesic antipyrebc. Used as a skin cream. Crystals mp 153-155 nearly insoluble in H2O LDso (rat orl) >4 g/kg, (mus orf) > 8 g/mg. CM. Ind. Pfizer Inc. 

Properties Wh. to cream crystals, flakes, or powd., faint fatty odor mod. 

Properties Wh. to cream crystals, flakes, or powd., faint fatty odor mod. sol. in water m.w. 288.38 sp.gr. > 1.1 (20 C) m.p. 204-207 C Toxicobgy LD50 (oral, rat) 1288 mg/kg, (IP, rat) 210 mg/kg, (IV, rat) 118 mg/kg poison by IV, IP routes mod. toxic by ing. human skin irritant experimental eye, severe skin irritant mild allergen experimental teratogen, reproductive effects mutagenic data TSCA listed... 

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