Rose crystals

Figure 2 depicts the variation of Scanning Electron Micrographs with crystallization time at different temperatures. At the beginning of the crystallization, the texture of obtained solid phase can be described as an agglomeration of fibrous (Fig. 2a, 2b, 2d). The 110 and 200 reflections are not present in the XRD pattern at this moment. When those reflections appear, the morphology characteristic of MCM-41 described by Tanev et al [6] or Elder et al [12] is detected (Fig,2e, 2f, 2h, 2j). Crystals have variable size and form and very porous surface. Finally when the triphasic mixture composed of hexagonal MCM-41, lamellar MCM-50 and amorphous phase is detected (Fig. 2i, 2k, 21), crystals with a sandy-rose like structure and spheric grains are clearly observed. The sandy-rose crystals belong to the MCM-50 lamellar structure [13] and the spheric grains correspond to the amorphous silica phase. The presence of MCM-50 and amorphous silica is proved by XRD patterns.

Properties (1) White, deliquescent, crystalline mass (2) rose crystals. D (1) 5.01, mp (1) 638C (in vacuum), bp (1) 1061C. Soluble in water with gradual decompostion soluble in alcohol. 

Methyl amyl ketone Rose crystals isoobutyrate... 

Addition of chloroform to benzaldehyde followed by esterification with acetic anhydride gives the trichloro derivative known as rose crystals or, more commonly by the misnomer, rose acetone. Such misnomers are not uncommon with older fragrance materials. Some... 

Bromide, ErBr. nonahydraie, deliquesc rose crystals. Prepn Jantsch er al, loc. cit. 

Beilstein Handbook Reference) Acetic acid, a-(trichloromethyl)benzyl ester AI3-02454 Benzenemethanol, a-(tricWoromethyl)-, acetate Benzyl alcohol, a-(trichloromethyl)-, acetate BRN 2270144 EINECS 201-972-0 NSC 165582 Rosacetol Rose crystals Trichlor phenyl methyl carbinyl acetate Trichloromethyl phenyl carbinyl acetate a-(Trichloro-methyl)benzyl acetate a-(Trichloromethyl)benzenemeth-anol acetate a-(Trichloromethyl)benzyl alcohol acetate . A rose scent used in the perfumery industry. Liquid mp = 85-87 . Bedoukian Research Inc. Frirtarom Nipa. 

Rose centifolia oil Rose concrete. See Rose oil Rose crystals. See... 

Trichloromethylphenylcarbinyl acetate CAS 90-17-5 EINECS/ELINCS 201-972-0 Synonyms Rose crystals a-(Trichloromethyl) benzenemethanol, acetate a-(Trichloromethyl) benzyl acetate a-(Trichloromethyl) benzyl alcohol, acetate a-Trichloromethylphenyl carbinyl acetate... 

Perfumes and Cosmetics. Vanillin, a crystal, is the main constituent of the vanilla bean. Its importance can be illustrated by the fact that human preferences in fragrances and in flavors, as determined by various studies, comprise three main smells or tastes rose, vanilla, and strawberry. 

P,17P-Dihydroxyestr-4-en-3-one 1-acetate. The 6-hydroxy compound is removed from the column with 15-17% acetone. Recrystallization of the crude product (1.92 g) from acetone-hexane gives 1.25 g of crystals melting at 165-166° and 0.13 g melting at 162-164° (12.1% yield). When the analytical sample was prepared from the same solvent mixture, the melting point rose to 192-193° (Lit 166° 189-190°) [a] -59.5° (CHCI3) 2, 236 m/i (fi 14,500). 

In about 5-10 minutes a clear solution resulted, whereupon slow crystallization occurred and the temperature rose to about 6°-7°C. The crystallization was permitted to continue overnight at 5°C, and the very fine precipitate was then isolated by centrifugation and in the centrifuge washed with water, ethanol, and ether, yielding the dihydrate of DL-seryl-(2,3,4-trihydroxy-benzylidene) hydrazide hydrochloride, which melted at 134°-136°C and was poorly soluble in cold water, but very readily dissolved in hot water. The condensation was also effected in absolute ethanol yielding the anhydrous form of the hydrazone, which melted at 225°-228°C. 

Preparation of Intermediate Compound N-Acetyl-5-Chloro-2-Methylaniline To a well-stirred mixture of 1,270 g (9 mols) of 5-chloro-2-methylaniline in 7.5 liters of water at 34°C was added all at once 1,710 ml (18 mols) of acetic anhydride. A solution was obtained and then almost immediately the product started to crystallize. The temperature rose to 60°C. The mixture was stirred until the temperature dropped to 30°C. The product was filtered and washed well with water. Yield 97% (1,640 g), MP 134° to 138°C. Product was air dried and then in vacuum over PjOs. 

A mixture of the arylsulfonyl chloride (5 mmol), benzene (2.56 mol), NaN3 (5 mmol), NaHCO, (20 mmol), and methyltrioctylammonium chloride (0.5 mmol), under N2 in an autoclave, was stirred al 40 C for 3 h. The mixture was then heated slowly to 125 C and maintained at this temperature for another 3 h, during which time the pressure in the vessel rose to 31 -54 atm. The mixture was allowed to cool and the autoclave was depressurized. The residual mass was filtered, and the residue washed thoroughly with cold H20. The benzene solution was separated from the aqueous filtrate, dried, and evaporated to give the crude product as a reddish yellow mass which was purified by column chromatography (neutral alumina, hexane/ benzene 3 2). The 1-(arylsulfonyl)-l//-azepines 16 were crystallized from light petroleum ether (bp 60-80 LC). 

White crystals with a rose- or geranium-like odor. 

Earl Grey tea is flavored with the peel oil of bergamot, a citrus fruit, which is added by spraying onto black tea before final packaging. Other flavors may also be applied to black tea by spraying onto the leaves, incorporation of flowers into the blend, or by addition of encapsulated flavor crystals. Other common flavored teas include Rose Congou and Lychee. 

Lead may leach from lead crystal decanters and glasses into the liquids they contain. Port wine that contained an initial concentration of 89 pg/L lead was stored for 4 months in crystal decanters containing up to 32% lead oxide. At the end of 4 months lead concentrations in the port were 5,331, 3,061, and 2,162 pg/L in decanters containing 32%, 32%, and 24% lead oxide, respectively. Lead was also found to elute from lead crystal wine glasses within minutes. Mean lead concentrations in wine contained in 12 glasses rose from 33 pg/L initially to 68, 81, 92, and 99 pg/L after 1, 2, 3, and 4 hours, respectively (Graziano and Blum 1991). 

The heat capacity of the crystal was measured in the 0.06-0.28 K temperature range using a relaxation method (see Section 12.2.3). A small power supplied by the heater rose the temperature Tc of the crystal above TB by a few millikelvin. When the thermal equilibrium was reached, the heating power was switched off, and the exponential decay of the crystal temperature was recorded by means of an LR700 bridge (see Section 10.8), at a rate of 5 sample/s. 

De Luca et al. [1.48] showed, that the addition of 5 % tertiary butyl alcohol (tBA) to aqueous sucrose and lactose solutions (up to 40 %) resulted in a frozen matrix, which could be easily freeze dried. De Luca demonstrated by DSC that the melting point rose distinctly (with 60 % solution to -10 °C), but the endothermic of melting returned to 25 %, indicating that not much water had frozen. In solutions with 5 % tBA the exothermic of crystallization became more visible and the melting of tBA could be recognized. 

The effect of aluminium on the surface area of goethite depends on the level of Al in the system and on the source of iron. Other conditions being equal, Al reduces both the rate of growth and the crystal size its effect on surface area depends on which of these two effects predominates. The surface area (EGME) of goethite grown from ferrihydrite in 0.3 M KOH at 25 °C dropped from 52 to 26 m g as the extent of Al substitution rose from 0 to 0.16 mol mol (Schulze and Schwertmann, 1987). This effect was attributed to an increase in crystal thickness along the [001] direction... 

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