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Phenethyl
Phenethyl alcohol, or 2-phenylethanol, is the organic compound that consists of a phenethyl group (C6H5CH2CH2) attached to OH. It is a colourless liquid that is slightly soluble in water (2 ml/100 ml H2O), but miscible with most organic solvents. It occurs widely in nature, being found in a variety of essential oils. It has a pleasant floral odor. Synthesis Phenethyl alcohol is prepared commercially via two routes. Most common is the Friedel-Crafts reaction between benzene and ethylene oxide in the presence of aluminium trichloride. :C6H6 + CH2CH2O + AlCl3 → C6H5CH2CH2OAlCl2 + HCl The reaction affords the aluminium alkoxide that is subsequently hydrolyzed to the desired product. The main side product is diphenylethane, which can be avoided by use of excess benzene. Hydrogenation of styrene oxide also affords phenethyl alcohol. Laboratory methods Phenethyl alcohol can also be prepared by the reaction between phenylmagnesium bromide and ethylene oxide: :C6H5MgBr + CH2C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Additives In Cigarettes
This is a list of 599 additives that could be added to tobacco cigarettes. The ABC News program ''Day One'' first released the list to the public on March 7, 1994.Timelines - Full Chronology , Inside The Tobacco Deal PBS. ''''. It was submitted to the in April 1994. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phenylalanine
Phenylalanine (symbol Phe or F) is an essential α-amino acid with the formula . It can be viewed as a benzyl group substituted for the methyl group of alanine, or a phenyl group in place of a terminal hydrogen of alanine. This essential amino acid is classified as neutral, and nonpolar because of the inert and hydrophobic nature of the benzyl side chain. The L-isomer is used to biochemically form proteins coded for by DNA. Phenylalanine is a precursor for tyrosine, the monoamine neurotransmitters dopamine, norepinephrine (noradrenaline), and epinephrine (adrenaline), and the skin pigment melanin. It is encoded by the codons UUU and UUC. Phenylalanine is found naturally in the milk of mammals. It is used in the manufacture of food and drink products and sold as a nutritional supplement for its analgesic and antidepressant effects. It is a direct precursor to the neuromodulator phenethylamine, a commonly used dietary supplement. As an essential amino acid, phenylal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ethylene Oxide
Ethylene oxide is an organic compound with the formula . It is a cyclic ether and the simplest epoxide: a three-membered ring consisting of one oxygen atom and two carbon atoms. Ethylene oxide is a colorless and flammable gas with a faintly sweet odor. Because it is a strained ring, ethylene oxide easily participates in a number of addition reactions that result in ring-opening. Ethylene oxide is isomeric with acetaldehyde and with vinyl alcohol. Ethylene oxide is industrially produced by oxidation of ethylene in the presence of silver catalyst. The reactivity that is responsible for many of ethylene oxide's hazards also makes it useful. Although too dangerous for direct household use and generally unfamiliar to consumers, ethylene oxide is used for making many consumer products as well as non-consumer chemicals and intermediates. These products include detergents, thickeners, solvents, plastics, and various organic chemicals such as ethylene glycol, ethanolamines, simple an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rose Oil
Rose oil (rose otto, attar of rose, attar of roses, or rose essence) is the essential oil extracted from the petals of various types of rose. ''Rose ottos'' are extracted through steam distillation, while ''rose absolutes'' are obtained through solvent extraction, the absolute being used more commonly in perfumery. The production technique originated in Persia. Even with their high price and the advent of organic synthesis, rose oils are still perhaps the most widely used essential oil in perfumery. Components Two major species of rose are cultivated for the production of rose oil: * ''Rosa damascena'', the damask rose, which is widely grown in Bulgaria, Syria, Turkey, Russia, Pakistan, India, Uzbekistan, Iran and China * '' Rosa centifolia'', the cabbage rose, which is more commonly grown in Morocco, France and Egypt. The most common chemical compounds present in rose oil are: citronellol, geraniol, nerol, linalool, phenyl ethyl alcohol, farnesol, stearoptene, α-pinene, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Styrene Oxide
Styrene oxide is an epoxide derived from styrene. It can be prepared by epoxidation of styrene with peroxybenzoic acid, in the Prilezhaev reaction: Styrene oxide is slightly soluble in water. A trace amount of acid in water causes hydrolysis to racemic phenylethyleneglycol via a benzylic cation. If the amount of water is not sufficient, acid-catalyzed isomerization for phenylacetaldehyde will occur. Styrene oxide in the body is metabolized to mandelic acid, phenylglyoxylic acid, benzoic acid and hippuric acid. Hydrogenation of styrene oxide affords phenethyl alcohol. Stereospecific reactions Since styrene oxide has a chiral center at the benzylic carbon atom, there are (''R'')-styrene oxide and (''S'')-styrene oxide. If optically pure reagent is used, only one optically pure compound will be obtained. Toxicology Styrene oxide is a main metabolite of styrene in humans or animals, resulting from oxidation by cytochrome P450. It is considered possibly carcinogenic from ga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phenylacetic Acid
Phenylacetic acid (PAA; conjugate base phenylacetate), also known by various synonyms, is an organic compound containing a phenyl functional group and a carboxylic acid functional group. It is a white solid with a strong honey-like odor. Endogeny (biology), Endogenously, it is a catabolism, catabolite of phenylalanine. As a chemical industry, commercial chemical, because it can be used in the illicit production of phenylacetone (used in the manufacture of substituted amphetamines), it is subject to Chemical Diversion and Trafficking Act, controls in countries including the United States and China. Occurrence Phenylacetic acid has been found to be an active auxin (a type of plant hormone), found predominantly in fruits. However, its effect is much weaker than the effect of the basic auxin molecule indole-3-acetic acid. In addition the molecule is naturally produced by the metapleural gland of most ant species and used as an antimicrobial. It is also the oxidation product of phenet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neroli
Neroli oil is an essential oil produced from the blossom of the bitter orange tree (''Citrus aurantium subsp. amara'' or ''Bigaradia''). Its scent is sweet, honeyed and somewhat metallic with green and spicy facets. Orange blossom is also extracted from the same blossom and both extracts are extensively used in perfumery. Orange blossom can be described as smelling sweeter, warmer and more floral than neroli. The difference between how neroli and orange blossom smell and why they are referred to with different names, is a result of the process of extraction that is used to obtain the oil from the blooms. Neroli is extracted by steam distillation and orange blossom is extracted via a process of enfleurage (rarely used nowadays due to prohibitive costs) or solvent extraction. Production The blossoms are gathered, usually by hand, in late April to early May. The oil is extracted by steam distillation. Tunisia, Morocco, and Egypt are the leading producers of Neroli. History By ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Champaca
''Magnolia champaca'', known in English as champak (), is a large evergreen tree in the family Magnoliaceae.efloras.org: Flora of China treatment of ''Michelia (Magnolia) champaca'' accessed 7.12.2015 It was previously classified as ''Michelia champaca''. It is known for its fragrant flowers, and its timber used in woodworking. Etymology The species epithet, ''champaca'', comes from the Sanskrit word ().Vernacular names Other vernacular names in English include joy perfume tree,[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Autoantibiotic
Autotoxicity, meaning self-toxicity, is a biological phenomenon whereby a species inhibits growth or reproduction of other members of its same species through the production of chemicals released into the environment. Like allelopathy, it is a type of interference competition but it is technically different: autotoxicity contributes to intraspecific competition, whereas allelopathic effects refer to interspecific competition. Furthermore, autotoxic effects are always inhibitory, whereas allelopathic effects are not necessarily inhibitory–they may stimulate other organisms. This mechanism will result in reduced exploitative competition between members of the same species and may contribute to natural thinning in established communities. Inhibition of the growth of young plants will increase the availability of nutrients to older, established plants. In cultivation, autotoxicity can make it difficult or impossible to grow the same species after harvest of a crop. For example, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Candida Albicans
''Candida albicans'' is an opportunistic pathogenic yeast that is a common member of the human gut flora. It can also survive outside the human body. It is detected in the gastrointestinal tract and mouth in 40–60% of healthy adults. It is usually a commensal organism, but it can become pathogenic in immunocompromised individuals under a variety of conditions. It is one of the few species of the genus '' Candida'' that causes the human infection candidiasis, which results from an overgrowth of the fungus. Candidiasis is, for example, often observed in HIV-infected patients. ''C. albicans'' is the most common fungal species isolated from biofilms either formed on (permanent) implanted medical devices or on human tissue. ''C. albicans'', ''C. tropicalis'', ''C. parapsilosis'', and ''C. glabrata'' are together responsible for 50–90% of all cases of candidiasis in humans. A mortality rate of 40% has been reported for patients with systemic candidiasis due to ''C. albicans' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Organic Compound
In chemistry, organic compounds are generally any chemical compounds that contain carbon-hydrogen or carbon-carbon bonds. Due to carbon's ability to catenate (form chains with other carbon atoms), millions of organic compounds are known. The study of the properties, reactions, and syntheses of organic compounds comprise the discipline known as organic chemistry. For historical reasons, a few classes of carbon-containing compounds (e.g., carbonate salts and cyanide salts), along with a few other exceptions (e.g., carbon dioxide, hydrogen cyanide), are not classified as organic compounds and are considered inorganic. Other than those just named, little consensus exists among chemists on precisely which carbon-containing compounds are excluded, making any rigorous definition of an organic compound elusive. Although organic compounds make up only a small percentage of Earth's crust, they are of central importance because all known life is based on organic compounds. Liv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ylang-ylang
''Cananga odorata'', known as ylang-ylang ( ) or cananga tree, is a tropical tree that is native to the Philippines, Malaysia, Indonesia, New Guinea, the Solomon Islands, and Queensland, Australia. It is also native to parts of Thailand and Vietnam. It is valued for the essential oils extracted from its flowers (also called "ylang-ylang"), which has a strong floral fragrance. Ylang-ylang is one of the most extensively used natural materials in the perfume industry, earning it the name "Queen of Perfumes". The ylang-ylang vine ('' Artabotrys odoratissimus'') and climbing ylang-ylang ('' Artabotrys hexapetalus'') are woody, evergreen climbing plants in the same family. ''Artabotrys odoratissimus'' is also a source of perfume. Etymology and nomenclature The name ''ylang-ylang'' is the Spanish spelling of the Tagalog term for the tree, - a reduplicative form of the word , meaning "wilderness", alluding to the tree's natural habitat. A common mistranslation is "flower of flowers" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
