Line structural diagram

B) This condensed structural diagram shows only carbon-carhon bonds. (C) This line structural diagram uses lines to depict carbon-carbon bonds. 

Two-dimensional structural diagrams of organic compounds, such as condensed structural diagrams and line structural diagrams, work well for flat molecules. As shown in the table above, however, molecules containing single-bonded carbon atoms are not flat. 

O Draw a line structural diagram for each hydrocarbon. 

Draw a condensed structural diagram and a line structural diagram of each compound. Include the lUPAC name of the compound. 

A complete structural A condensed structural A line structural diagram is ... 

Comparing complete, condensed, and line structural diagrams... 

Predict the complete, condensed, and line structural diagrams for the three isomers of C5H12. Then predict the complete and condensed structural diagrams for the four isomers of C3H9N. 

Q O You have seen the expanded molecular formulas and condensed structural diagrams for the five isomers of C6Hi4. Draw the complete and line structural diagrams for each of these isomers. 

Fig. 7.17 RMS fits of two similar phenyl-cyclohexane conformations. The structural diagram indicates the two independent symmetry axes (dotted lines). The left-hand...

Fig. 5.3. Energy band-structure diagram (in eV) of Ni/ZnO support and pre-(post-)chemisorbed hydrogen adatom level at e0(e ). VB (shaded) and CB of ZnO are of width 6. Fermi level (e/), which coincides with lower edge of CB, is taken as zero of energy. 6-layer Ni film has 6 localized levels lying between band edges (dashed lines), which just overlap ZnO energy gap. Reprinted from Davison et al (1988) with permission from Elsevier.

Coordinate Representation. A coordinate representation of a chemical substance is a recording of the atoms and bonds of that substance with an indication of their relative position in a plane. This coordinate representation provides a valuable form to facilitate on-line, real-time manipulation of the structure diagram and to store the diagram for subsequent composition in journals, handbooks, and search output. Because this representation is difficult to manipulate, it is typically converted to some other form for other information system functions. Farmer and Schehr [11] describe the approaches and capabilities used at CAS for representing and processing a coordinate form of structure diagrams. 

In (b), the leftmost dotted line is shown bifurcated to indicate an additional level of conjugation if the carbons of the ionone ring are considered. This view stresses the fact that the conjugation level of the molecule can be considered to be either five or four, (c) provides a pure structural diagram of the same molecule. The terminal oxygen is shown connected to the end carbon by a double bond. This view is drawn to stress the total conjugation level of the molecule. Note the level of conjugation is now clearly six. 

B A structural diagram shows single bonds as single lines and multiple bonds as multiple lines. It does not show non-bonding pairs. It is less cluttered than a Lewis structure. It clearly shows whether the bonds involved are single, double, or triple bonds. 

If the ratio of the maximum dimension of the group to the maximum dimension of the diagram is less than a preset value, then that group is considered to constitute a symbol rather than a portion of the diagram line structure. 

In structural diagrams of organic molecules we use the convention that hydrogen atoms are usually implied, i.e. carbon atoms with only two bonds drawn also have two attached protons. The main exceptions are cases where stereochemistry is important and for groups such as OH, NH and SH. A wavy line may mean one unknown stereochemistry or it may mean a mixture of stereochemistries. This will usually be clear from the context of the question. 

Line drawing Structural formula Structural diagram Crystal structure... 

Fig. 18 Different representations of the same donor-acceptor [2]catenane. Line drawings (a) and condensed structural formulas (b) were the order of the day until the modem era of MIMs gave way to structural diagrams (c) and crystal structures (d). Graphical representations, also called cartoons (e), can be a helpful compromise between these representations when attempting to emphasize the topology, noncovalent bonding interactions, shape, beauty, or function of a MIM...

Access to all this information is provided by the Index Chemicus Registry System (ICRS), which contains records of new compounds and associated data on magnetic tape (6). Structures are described by the Wiswesser Line Notation (7), a system for describing chemical formulas in terms of a linear groups of symbols. A recent development is the ICRS Substructure Index (G5), which enables manual searches to be made for new chemical information, and is based on the occurrence of fragments of structures, the most common of which are illustrated as conventional structural diagrams. 

In the pages that follow, structural diagrams for tetrahedral molecules do not imply a particular configuration unless the bonds above and below the plane of the paper are indicated as a wedge and as a dashed-line, respectively. 

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