Table2.1Namesandformulasofthefirsttenunbranchedalkanes如何能写出所有异构体的数目给定分子式,如何能写出所有异构体的数目。方法是:•“抽出骨架,重新排列,舍去重复,再添枝叶”。•例1写出烷烃C6H14的所有同分异构体。•(1)抽出骨架:C-C-C-C-C-C•(2)重新排列,舍去重复:••主链为5个碳的有:•...
common and systematic. Common names originate in many different ways but share the feature that there is no necessary connection between name and structure. The name that corresponds to a specific structure must simply be memorized, much like learning the name of a person. Systematic names, on ...
Alkenes end with the suffix -ene, which can be used as an indicator when examining chemical names. The carbons in alkenes are {eq}sp^2 {/eq} hybridized, which gives them a trigonal planar shape, as shown in the image. ParameterAlkenes Type Unsaturated hydrocarbon Elements C and H Type ...
Thus benzene, toluene, and related hydrocarbons, while not particularly pleasant-smelling themselves, were classified as aromatic because they were obtained from fragrant substances. Joseph Loschmidt, an Austrian chemist, recognized in 1861 that most aromatic substances have formulas that can be derived ...
The second part of the name is based upon the number of carbons found in the backbone of the ring and uses the names derived from straight-chain alkanes. Depending on the number of carbons found in the ring, the following terms would be used as the second part of the cyclic hydrocarbon'...
The Structure Index presents a compilation of names, structures, and related datafor 660 aromatic hydrocarbons. The publication consists of two parts: (1) chemical structures including ring numbering, name(s), Chemical Abstract Service (CAS) Registry numbers, chemical formulas, molecular weights, and...
Flexibilizers are available under the trade names, ERL-4350 and LHT-240 from Union Carbide. A preferred flexibilizer is ethylene glycol which also serves as an initiator. When present, these are normally used in an amount ranging from 0.5 to 5% parts by weight per 100 parts of ...
C1 C8 C12 C14 C17 C19 2009/9/13 9 2.2 Hydrocarbons • Hydrocarbons are compounds that only contain H and C atoms, but they can be subdivided according to the following tree diagram depending on the bond types that are present Hydrocarbons Alkanes Alkenes Alkynes Arenes 2009/9/13 10 • ...