Monocyclic Aliphatic Compounds

This is the ethyl ester of a nine-carbon unsaturated acid with substituents. The 0X0 indicates that there is a keto function on carbon 7. Be careful to distinguish this from the prefix oxa-, which has a different meaning see Section 1.6. The asterisks indicate that the configuration designation is not absolute but rather represents that stereoisomer and/or the enantiomer thereof. Thus this name represents the R,R and/or the S,S isomers, but not/ ,S or S,R. This designation excludes diastereomers and is a common way to indicate a racemate. 

The ring is placed in the plane of the paper. Numbering of the ring starts at the location of the highest priority substitution, the carboxylic acid in this case. The butyl substituent on the third carbon of the ring has a keto function on the third carbon of the butyl chain. 

The ylidene indicates that the cyclohexyl is attached to the acetic acid by a double bond and the ethyl ester is indicated at the end for simplicity. The double-bonded ring atom is carbon 1 and the substituents on the ring are placed on the ring according to their locant numbers. The E indicates 

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Alicyclic Hydrocarbons. These refer to cyclic analogues of aliphatic hydrocarbons and are named accordingly, using the piefix cyclo-." Their properties are similar to their open-chain aliphatic counterparts. Alicyclic hydrocarbons are subdivided into monocyclic (cycloalkanes, cycloalkenes, cycloalkynes, cycloalkadienes, etc.) and polycyclic aliphatic compounds. Monocyclic aliphatic structures having more than 30 carbon atoms in the ring are known, but those containing 5 or 6 carbon atoms are more commonly found in nature [47, p. 28]. 

Clearly, Greek or Latin numeral roots in conjunction with numerical locants can be used to indicate the number and positions of fluorine substituents in any type of organo-fluorine compound or group, ranging from monofluorinated systems, e.g. 2-fluorobutane (1), to perfluorinated entities, e.g. l,l,l,2.2,3,4,4,4-nonafluoro-3-iodobutane(2). Fluorine locants may be omitted, and often are in non-indexing situations when naming simple and therefore easily visualized fully fluorinated aliphatic/cycloaliphatic or monocyclic aromatic compounds or groups, e.g. octafluoropropane (3), hexafluorocyclopropane (4), pentafluoropropanoic acid, (5). pentafluorophenyl (6). 

These may occur in water, sediment, or air samples, and several procedures have been used for analytes including halogenated aliphatic compounds, low-molecular-weight aliphatic ethers such as f-butyl methyl ether, and monocyclic aromatic hydrocarbons such as benzene, toluene, ethylbenzene, and xylenes (BTEX). 

The kinetics of the reactions of many xenobiotics with hydroxyl and nitrate radicals have been examined under simulated atmospheric conditions and include (1) aliphatic and aromatic hydrocarbons (Tuazon et al. 1986) and substituted monocyclic aromatic compounds (Atkinson et al. 1987c) (2) terpenes (Atkinson et al. 1985a) (3) amines (Atkinson et al. 1987a) (4) heterocyclic compounds (Atkinson et al. 1985b) and (5) chlorinated aromatic hydrocarbons (Kwok et al. 1995). For PCBs (Anderson and Hites 1996), rate constants were highly dependent on the number of chlorine atoms, and calculated atmospheric lifetimes varied from 2 days for 3-chlorobiphenyl to 34 days for 2,2, 3,5, 6-pentachlorbiphenyl. It was estimated that loss by hydroxylation in the atmosphere was a primary process for removal of PCBs from the environment. It was later shown that the products were chlorinated benzoic acids produced by initial reaction with a... 

Petroleum hydrocarbons contain a wide range of substances that are potential health hazards. These include aliphatic compounds, monocyclic aromatics, polycyclic aromatics, and heavy metals. Most petroleum products have an objectionable taste and odor well below the level that might induce chronic toxicity in humans. Thus, the most frequently reported symptoms of exposure are relatively mild and include nausea, vomiting, and diarrhea. 

Polyhydroxy Compounds. Polycyclic acetals are obtained fro] hydroxy aliphatic compounds and formaldehyde in much the sai that the simpler monocyclic formals are produced, In genera compounds are crystalline solids. 

Monocyclic 1,3-oxazepines (325) with aryl substituents at the 2-, 4- and 7-positions can be prepared in moderate yield (20-40%) by the reaction of aliphatic diazo compounds with 1,3-oxazinium perchlorates (324) (74S187). Tetra- and penta-phenyl-l,3-oxazepines (328 R = H or Ph) have been obtained via the reaction of azide with pyrylium salts (326) (78H(l 1)331). This principle had earlier been applied to the preparation of 1,3-benzoxazepines (74CR(C)(278)1389> and more recently to 3,1-benzoxazepines (81JHC847). The preparation of 2-phenyl-1,3-oxazepine.(331) by the UV irradiation of (329) is mechanistically interesting in that it apparently involves an intermediate (330) of the same type as (327) (73TL1835), but the method has only been used in this one case. One of the few examples of a dihydro-1,3-oxazepine (333) has been prepared by the thermolysis of the aziridine (332) (68JOC4547). 

Monocyclic 1,3-oxazepines (290) can be prepared by reaction of aliphatic diazo compounds with... 

Mixtures of gaseous or liquid hydrocarbons which can be vaporized represent the raw materials preferable for the industrial production of carbon black. Since aliphatic hydrocarbons give lower yields than aromatic hydrocarbons, the latter are primarily used. The best yields are given by unsubstituted polynuclear compounds with 3-4 rings. Certain fractions of coal tar oils and petrochemical oils from petroleum refinement or the production of ethylene from naphtha (aromatic concentrates and pyrolysis oils) are materials rich in these compounds. These aromatic oils, which are mixtures of a variety of substances, are the most important feedstocks today. Oil on a petrochemical basis is predominant. A typical petrochemical oil consists of 10-15% monocyclic, 50-60% bicyclic, 25-35% tricyclic, and 5-10% tetracyclic aroma tes. 

Callahan, M.A., Slimak, M.W., Gabel, N.W., May, I.P, Fowler, C.F., Freed, J.R., Jennings, P., Durfee, R.L., Whitemore, F.C., Maestri, B., Mabey, W.R., Holt, B.R., Gould, C. (1979) Water-Related Environmental Fate of 129 Priority Pollutants. Vol.II, Halogenated aliphatic hydrocarbons, halogenated ethers, monocyclic aromatics, phthalate esters, polycyclic aromatic hydrocarbons, nitrosoamines and miscellaneous compounds. LPAH40/4-79-029b. 

Polycyclic aromatic nitrogen compounds, such as quinoline, indole, acridine, and carbazole, are the main nitrogen-containing compounds in oil fractions, and monocyclic pyridine and pyrrole as well as anilines are present in coal tar (Scheme 11). Saturated cyclic amines are found as products of ring hydrogenation of the compounds shown in Scheme 11 after HDN. Aliphatic amines are rarely found in fuels and only in low concentrations after HDN since their nitrogen atoms are easily removed. 

Monocyclic 1,3-oxazepines 419 can be prepared by reaction of aliphatic diazo compounds with 1,3-oxazinium perchlorates 418 (Scheme 194) <1974S187>. Tetra- and penta-phenyl-1,3-oxazepines 421 (R = H or Ph) have been obtained by the reaction of azide ion with pyrylium salts 420 (Scheme 195) <1978H(11)331>. 

EPA. 1979. Water-related environmental fate of 129 priority pollutants. Vol. II Halogenated aliphatic hydrocarbons, halogenated ethers, monocyclic aromatics, phthalate esters, polycyclic aromatic hydrocarbons, nitrosamines, miscellaneous compounds. U.S. Environmental Protection Agency, Washington, DC. EPA-440/4-79-029B. 

Terpenes are most familiar, at least by odor, as compounds of the so-called essential oils obtained by steam distillation or ether extraction of various plants. Thousands of different terpenes are known. According to the isoprene rule proposed by L. Ruzicka in 1921, they can be considered to arise from head-to-tail joining of simple five-carbon isoprene (2-methyl-1,3-butadiene) units. Terpenes are subdivided into groups depending on the number of isoprene units [9]. For example, monoterpenes are 10-carbon substances biosynthesized from two isoprene units, which can be divided into aliphatic, monocyclic, or bicyclic species Some typical exponents of each monoterpene subgroup are shown in Fig 1... 

In combination with other validated QSARs (Table 4.10), hierarchic models are recommended for estimating the biodegradability of three major classes of environmental contaminants acyclic compounds, monocyclic carboaro-matic compounds and aliphatic cyclic compounds (Figures 4.8-4.10). 

The number of sesquiterpenes is high (over 150 compounds). There are compounds with aliphatic (farnesenes), monocyclic (humulenes, bisabolenes, elem-enes), bicyclic (cadinenes, muurolenes, selinenes, caryophyllenes, germacrenes), tricyclic (copaenes, ylangenes, longifolenes.longicyclenes), and tetracyclic (sati-vene) structures. 

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