Principles aromatic

Duftstoff, m. odorous substance, aromatic principle, perfume,... 

A brief comment is in order about the application of the aromatic principle to excited states. The individual orbitals are not as easily followed as they are with the Woodward-Hoffmann approach. Zimmerman has used the Hiickel v electron method to trace levels through some representative processes 37 the behavior is essentially the same as that found by Woodward and Hoffmann. The arguments about excited-state reactions that wd made in the previous section therefore follow as well from the Dewar-Zimmerman formulation, and... 

In 1853, it was demonstrated that coca leaves contained tannic acid and a peculiar bitter principle, resin, tannin, an aromatic principle, extractive, chlorophyll, a substance analogous to theine, and salts of lime. In 1855, the crystalline alkaloid erythroxyline was discovered in coca leaves, which was called cocaine. The earlier methods for isolating cocaine were as follows ... 

Rupe, H., Clar, G., Pfau, A.St and Planner, P. (1 934) Volatile plant constituents. II. Turmerone, the aromatic principle of turmeric oils (in German). Idelvetica Chimica Acta 17, 372. 

Canellacea Family.—Trees the bark of which contains aromatic principles. Leaves alternate, pellucid-punctate. Flowers regular, golden-yellow, and arranged in terminal or axillary cymes. Fruit a berry containing two to many seeds with oily anddleshy albumen. 

Esters derived from small- to medium-chain carboxylic acids and small- to medium-chain alcohols are the so-called fruit ethers. These are present in fruits and ethereal oils and are characterised by their pleasant aromas. A large variety of synthetic aromatic principles for use in the perfume industry can be synthesised from suitable carboxylic acids and alcohols. 

Certain aromas and flavors do not lend themselves to extraction by distillation and in these cases the infusion method is resorted to. In this process the aromatic substances are steeped in a solution of alcohol and sugar to which they impart their flavoring and aromatic principles. The solution may be colored and is then strained to separate the marc or solid residue. 

Reichstein T. and Staudinger H. (Int. Nahr. Genussm. AG) (1926a) Improvements in a method for isolating the aromatic principle contained in roasted coffee. Br. Patent 246454. 

Sethness R.E. (1924) Coffee s aromatic principles. Tea Coffee Trade J. 56, 570. 

Ukers W.H. and Prescott S.C. (1951) Works published on the aromatic principles of coffee. In The Chemistry and Technology of Food and Food Products, M.J. Jacobs Ed., Interscience, New York, pp. 1656-1705,... 

In distilling perfumes and cordials, tho object is to extract or separate the odorons and aromatic principle from the roots, flowers, seed, or spices used to import the characteristic odor aud taste to the liquor, and it is usual to mac(. rate such ingredients in strong alcohol several days before distillation. Great care should bo taken that the heat shauldt in all cases, he as gentle and uniform as possible. 

The nature of intermediate complexes on the surface of the catalyst can be considered using the "aromaticity principle" which was proposed by M.I.Temkin for explanation of the Balandin s multiplet theory of heterogeneous catalysis... 

Coumarin, mp 68°C, is a colourless crystalline compound it is the aromatic principle in woodruff and also occurs in other plants, e.g. lavender and melilot. Coumarin is prepared from salicylaldehyde by a Perkin reaction with acetic anhydride or by cyclocondensation with 1,1-dimorpholinoethene [27] ... 

Reichstein, T. Staudinger, H., Brit. Patent 246,454 and 260,960 (192Q, Improvements in a Method For Isolating the Aromatic Principle Contained in Roasted Coffee. 

The Aromatic Principle Spontaneous Acid (I acide spontane) Spontaneous Volatile Alkali Valkali volatil spontane)... 

Essential oils are secondary metabolites produced in the plants as volatile aromatic principles. They are colorless and rarely colored and soluble in organic solvents. It is fotmd in all part of the plants and is stored in epidermal cells, trichomes, secretory cells, canals, and cavities. They are extracted by the use of liquid carbon dioxide or microwaves, expression and mainly steam or hydrodistillation process. Due to their biological, nutritive, and pharmaceutical properties, they are more attractive alternatives to synthetic chemical products to protect the equilibrium. 

Q Coumarin, mp 68 °C, is a colorless crystalline compound it is the aromatic principle in... 

Contains civetone (9-cw-cycloheptadece-none) as its major aromatic principle others include butyric acid, skatole, cycloheptadeca-none, cyclononadecanone, and various saturated and unsaturated cyclic ketones and alcohols. 

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