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Jan
  • Member for 7 years, 9 months
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  • Hesse, Germany
25 votes
1 answer
2k views

When can a molecule be considered freely rotating at room temperature?

24 votes
2 answers
2k views

Which is the currently accepted mechanism of a Wittig reaction?

21 votes
3 answers
11k views

Why is manganese(II) coloured although the transition should be spin-forbidden?

17 votes
3 answers
4k views

Where does the label ‘Dq’ to denote the field split in coordination compounds come from?

16 votes
2 answers
1k views

Is the triplet state of the cyclopentadienyl cation really aromatic?

16 votes
1 answer
586 views

Why is an energy cost associated with splitting the HOMO spins in singlet oxygen?

16 votes
1 answer
6k views

By what mechanism do acids deprotect primary silyl ethers?

16 votes
1 answer
446 views

Why do some solvents bubble more than others when boiling?

14 votes
1 answer
2k views

What are point groups and the benefits of using them?

13 votes
2 answers
3k views

How is the Felkin-Anh model of stereoinduction correctly explained with MO theory?

12 votes
1 answer
359 views

What is the structure of trifluoromethanesulfonic acid in the gas phase?

11 votes
1 answer
293 views

Which electronic effects are responsible for the reduction of nucleophilicity of a hydroxy group orthogonal to an ester?

10 votes
2 answers
155 views

Is there a single MO that represents the π system of a Möbius aromatic system? If so, what does it look like?

10 votes
3 answers
434 views

Historically, how was the connection between NMR peaks and hydrogen atoms made?

9 votes
3 answers
977 views

Does the synthesis of beta-keto phosphonates from esters have a name?

9 votes
1 answer
586 views

On the mechanism of the nitrogen-removal step of the Wharton olefin synthesis

8 votes
1 answer
2k views

The electron configuration and electron density distribution in singlet oxygen

7 votes
1 answer
563 views

What does the molecular orbital scheme of beryllium chloride and hydride look like?

7 votes
1 answer
337 views

On the oxyacids of +III pnictogens and +IV chalcogens

6 votes
1 answer
9k views

Is there a consensus how to report coupling patterns greater than quartets?

6 votes
2 answers
1k views

How is the configuration of an ester enolate double bond assigned according to CIP?

5 votes
1 answer
2k views

Where does the name ‘aliphatic’ come from?

5 votes
1 answer
142 views

What mechanisms might make a substance travel different distances on the same TLC plate?

4 votes
1 answer
1k views

How to explain two NMR spectra of the (allegedly) same compound with slightly different shifts?

4 votes
1 answer
219 views

Is there an established procedure for titanium tetrachloride titration?

4 votes
0 answers
832 views

Is the para-position of anisoles more reactive than ortho in electrophilic substitutions?

4 votes
1 answer
616 views

Safest way to conduct a reaction with bromine under reflux conditions

3 votes
1 answer
789 views

What changes does zinc chloride undergo when ‘fusing’ on an atomic level? How does this influence reactivity?

3 votes
0 answers
1k views

Why is the bond angle of sulphur dioxide close to 120°, not 90°?

3 votes
1 answer
917 views

How to distinguish diastereomers of unsaturated ketones by NMR?