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18 votes
Accepted

What's the difference between a 'centered' and 'side' double bond on a structural formula?

There are many recommendations about double bonds in the Graphical Representation Standards for Chemical Structure Diagrams (IUPAC Recommendations 2008). In particular, the general rule GR-1.10.1 If ...
Loong's user avatar
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17 votes

What is the correct way to illustrate a bond to something irrelevant in a structural formula?

Just as a side note, I think it is easier to use ChemDraw to make the graphics then import them into your LaTeX file, rather than using the chemfig package which (I find) is cumbersome. Obviously it's ...
orthocresol's user avatar
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17 votes

Organic Structure Challenge

$\ce{C20H18}$, 246 characters ...
Daniel Bonniot de Ruisselet's user avatar
15 votes

Structural representation of substituted benzene

When you see a line coming out of an aromatic ring as shown, it is meant to suggest that the substituent (in this case chlorine) could be at any position. The notation is often used when a reaction ...
NotEvans.'s user avatar
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15 votes
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I cannot find the structural formula with a particular compound's IUPAC name

The name given is not standard. Fluoran itself is a spiro compound with two components: (it's strictly an isobenzofuranone, but I'm lazy to type that multiple times.) Because of the nomenclature ...
orthocresol's user avatar
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15 votes

Organic Structure Challenge

$\ce{C20H18}$, 153 characters ...
andselisk's user avatar
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15 votes

How can I draw alpha helices in ChemDraw?

I use ChemDraw Professional 19.1.1.32. If you follow File>Open Templates>Advanced BioDraw, you will find the black helix that I have reoriented from horizontal to vertical. The red helix was ...
user55119's user avatar
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13 votes

Portable library to render 2D structural formulas as vector graphics from SMILES or InChI

You might want to have a look at Open Babel. It is licensed under GNU GPLv2 It has bindings for Python It has bindings for PHP It has bindings for Ruby It can read (and write) SMILES It can read (...
Klaus-Dieter Warzecha's user avatar
13 votes

How can I draw alpha helices in ChemDraw?

This illustration may be a combination of two images, or simply a program I don't know about. However, there are many (3D) protein visualisation programs that can show alpha-helices such as PyMol, VMD ...
CuriousTree's user avatar
12 votes
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How were old style stereographic structures produced?

Created in FORTRAN by Carroll K. Johnson, of the Oak Ridge National Laboratory (ORNL), and first released in 1965, ORTEP (Oak Ridge Thermal-Ellipsoid Plot Program) rapidly became a favorite of ...
DavePhD's user avatar
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12 votes
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How to infer formula from diagram

Each carbon atom (you seem to have identified them) needs four of those stick-like thingies (the lines, sometimes called "bonds"). These include the dashed lines and thick triangles as well as the "...
Raditz_35's user avatar
  • 401
12 votes

Organic Structure Challenge

$\ce{C18H20}$ : 145 characters I was curious as to the isomer with the longest name that had actually been reported in the literature rather than hypothetically proposed (so we at least know it exists)...
NotEvans.'s user avatar
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11 votes

Portable library to render 2D structural formulas as vector graphics from SMILES or InChI

You should also look at RDKit, which is at its core is C++ code for manipulating molecular structures, but which also has Python and Java bindings. Most people use it via its Python bindings. Here's ...
Curt F.'s user avatar
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11 votes
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Identify two amines

The proposed strucutre of these compound are, correct me if i am wrong.
Khan's user avatar
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11 votes
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How can I find out a substance's name from its structural formula?

That's betanin, from which beets derive much of their deep purple color, and which may have neuro-protective (Ref. 1) features. The following is the structure retrieved from the wikipedia (on 2019-10-...
Buck Thorn's user avatar
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11 votes
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ChemDraw: how to change the default aromatic ring style for drawing from SMILES

From pp. 91–92 ChemDraw 20.0 User Guide, PDF version shipped with the ChemOffice suite: Toggle Aromatic Display An aromatic structure can be displayed either as an alternating double and single bond ...
andselisk's user avatar
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10 votes

Identify two amines

$\ce{Fc}$ stands for ferrocenyl. So the first compound is an amide of ferrocenecarboxylic acid and tetramethylene diamine, and the second compound is p-ferrocenyl aniline.
aventurin's user avatar
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10 votes
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What compound does this chemical formula represent?

The structure represents adrenaline or 'epinephrine' (en.wikipedia.org/wiki/Epinephrine). As in: Go out and have an adrenaline rush on your birthday!! The image on wikipedia has a slightly rotated ...
gilleain's user avatar
  • 1,735
10 votes

Organic Structure Challenge

Here is my input with character count increasing up to down. I have added InChI codes because it seems MarvinSketch is less capable of reading names than it is in their generation. 1. $\ce{C20H18}$: ...
Linear Christmas's user avatar
9 votes

Understanding the bond-line representation of glycine

There are different ways to represent chemical structures. The first one is called structural formula, in this case we write down every atom and lines between them for every bond. This is usually the ...
DSVA's user avatar
  • 5,792
9 votes
Accepted

How to draw Fischer projections for carbon chain having more than two carbons?

The first things to note when drawing Fischer projections are the general rules for drawing them. The first general rule concerns the choices of ‘top’ and ‘bottom’ while the second concerns how each ...
Jan's user avatar
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9 votes

How can I draw alpha helices in ChemDraw?

This answer is for ChemDoodle, but I think you can import SVG files into ChemDraw as well. Just take an SVG image of an alpha helix and copy and paste it into ChemDoodle. Or go to File -> Insert ...
user137's user avatar
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9 votes

Shouldn't the Cl- be placed beside the charged N+ ion when writing the structural formula of Benzenediazonium chloride?

With respect to the point of your question, both ion placements are acceptable for the specified form of the salt's structural formula. From section GR-7.2 Positioning of components [1, p. 383] (...
andselisk's user avatar
  • 38.3k
8 votes

Double bond crossed lines representation

It is, for example, used by Marvin JS -- one of the editors in the GUI of Reaxys by Elsevier to query the database for structures, where you do not impose either (E)-, nor (Z)-configuration of the ...
Buttonwood's user avatar
  • 30.1k
8 votes

Organic Structure Challenge

$\ce{C20H18}$, 290 characters Heavily based on Daniel Bonniot de Ruisselet's idea, the two "spiraned" cyclopropane pairs next to ending cyclopropenes are fused to bicyclobutanes as well, ...
mykhal's user avatar
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8 votes
Accepted

Meaning of the term "vertex" in the topic of skeletal formulae

The term vertex (plural vertices) comes from the nomenclature used in graph theory, a branch of mathematics which describes how points in a given space are connected to each other. This turns out to ...
Nicolau Saker Neto's user avatar

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