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Gr-3. Orientation of structures.(GRAPHICAL REPRESENTATION STANDARDS FOR CHEMICAL STRUCTURE DIAGRAMS **)
- Article from:
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Pure and Applied Chemistry
- Article date:
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February 1, 2008
- Author:
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Copyright informationCOPYRIGHT 2008 International Union of Pure and Applied Chemistry. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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When considering the guidelines to follow for the orientation of chemical structures, perhaps the most important thing to keep in mind is that, as far as chemical meaning is concerned, they do not matter. With a single exception in the case of Fischer projections [17,18], simple rotation of a chemical structure within the plane of the diagram will never affect its chemical meaning. Flipping a portion of a structure requires a corresponding adjustment of stereobonds (solid wedged bonds must be changed to hashed wedged bonds, etc.), but changes nothing otherwise. In terms of chemical meaning, the orientation of structures is irrelevant.
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