All Questions
Tagged with notation organic-chemistry
38
questions
2
votes
1
answer
47
views
What does ‘S/A’ mean in SMARTS pattern when using Chemicalize to draw the chemical structure?
I am still new to the SMARTS annotation. I am wondering what does S/A’ mean on the bond labeling drawn with Chemicalize using SMARTS [!#1]c1n[cH]nc([!#1])c1[!#1]? ...
- 131
3
votes
1
answer
197
views
What does ‘(A)’ mean in SMARTS pattern when using Chemicalize to draw the chemical structure?
I am not quite sure what ‘(A)’ could mean for the carbon atom when writing the SMARTS CCN(C)C using Chemicalize to draw the chemical structure below. Can anyone ...
- 131
5
votes
1
answer
103
views
Symbol to denote a group which is either an oxygen atom or NH group
I'm drawing the generic structure of several different organic molecules in my thesis. They share some features, one of which is a carbonyl carbon attached to either an oxygen atom (i.e. ester) or an $...
- 215
2
votes
2
answers
984
views
How to draw chair-form for trans-decalin (with slight variation)?
I understand how to draw chair form for trans-decalin (figure 1) for the usual structure, but I am having difficulty if taken as shown in figure 2 wherein the hydrogens at bridge-head carbons are in ...
- 31
3
votes
0
answers
638
views
What do γ (gamma) and λ (lambda) mean in organic chemistry?
From the Wikipedia entry on Cyhalothrin:
Pyrethroids such as cyhalothrin are often preferred as an active
ingredient in agricultural insecticides because they are more
cost-effective and longer ...
- 1,795
-1
votes
1
answer
457
views
Type of diagram and ordering of bonds used to depict a glucose molecule
I find these type of diagrams
easier to consult when building molecules using a 'molecular building kit'. Is there a name for this type of diagram?
For the glucose molecule (in the above diagram), I ...
- 121
2
votes
1
answer
563
views
What does A. R. in A. R. sodium nitrite mean?
I'm reading about a reaction from a 1970s organic chemistry book. It references A. R. sodium nitrite. What does the A. R. mean?
I see from online that "Ar" means aromatic ring. Is that the ...
- 211
6
votes
2
answers
727
views
What does K° signify in this reaction?
What does the K° signify in the above reaction. Is it just a typo, or is it supposed to symbolize something?
EDIT: This screenshot is from the solutions manual. In the original textbook, the author ...
- 1,041
18
votes
2
answers
9k
views
What is the "‡" symbol meaning in a reaction mechanism?
I was studying hydroboration from Clayden's Organic Chemistry [1, p. 1281] and the transition state had “‡” symbol in the upper right corner of the activated complex:
We know that this is not the ...
1
vote
1
answer
68
views
Writing a organic reaction in different form
Can I write this reaction
$$\ce{A + B ->[\ce{X}] C + D ->[\ce{Y}] E + F}$$
as
$$\ce{A + B ->[\ce{(1) X}][\ce{(2) Y}] E + F}$$
Can I write any organic reaction in this way or are there any ...
- 141
2
votes
2
answers
18k
views
How to convert wedge–dash structure into Fischer projection? [closed]
I am very confused when a compound with more than one chiral centre is given. How to find whether the two compounds are enantiomers or diasteromers?
Please also explain how to convert more than one ...
- 244
14
votes
1
answer
4k
views
For a benzene shown in a skeletal structure, what does a substituent to the center of the ring mean? [duplicate]
I have seen diagrams with both the substituents attached to the benzene ring by the edges and other occasions directly to the delocalized ring. What does signify?
- 313
5
votes
1
answer
1k
views
How to report a triplet of septets in NMR tabulation?
Does anyone know the proper format to report an iso-butyl group, eg. $\ce{R-CH2-C\color{red}{H}(CH3)2}$, in $\ce{^1H}$ NMR tabulation? The proton in red should be a triplet of septets, so I've written:...
- 103
5
votes
2
answers
1k
views
How to draw protonated benzene (horseshoe) carbocation structure with ChemDraw?
Is there a way to draw the aromatic "horseshoe" (forgot the official name) structure of a protonated benzene cation (arenium) with ChemDraw, and not the cation with double bonds?
- 188
8
votes
1
answer
2k
views
Does the Location of Line-Dash-Wedge Notations Matter?
In Line-Dash-Wedge notation, when illustrating that an atom or bond is directed towards or away from the viewer (solid triangle for coming forward, dotted lines for going back), does the location of ...
