Organic chemistry – Page 36
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ResearchHydrogen bonds help porphyrin bend aromaticity rules
Molecule undergoes unprecedented topology switch from Möbius aromatic to Hückel anti-aromatic when immersed in polar solvent
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ResearchMacrocycles power up carbon nanotubes
Interlocked molecules tune the electronic properties of nanotubes, allowing researchers to control their catalytic activity
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ResearchChemists weave granny and triple trefoil knots
Interwoven grids folded into mechanically interlocked molecules, including a super-coiled three-trefoil
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ResearchRadical chain reactions could solve soot formation mystery
New theory suggests how solid particles of soot – or interstellar dust – form as volatile gaseous precursors burn
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ResearchObserving orbitals solves hydrogen transfer puzzle
Visualising atoms’ wave function lets chemists tell true from indirect hydrogen atom transfer
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ResearchRed–blue light switch pushes equilibrium both ways
Switchable reaction cycle drives bond-making or breaking depending on light colour
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ResearchStacked copper clusters create semiconducting supramolecule
Mixed valencies and overlapping π-electron clouds help electrons move from molecule to molecule
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![Structural Characterization of r[5]C24+](https://d2cbg94ubxgsnp.cloudfront.net/Pictures/100x67/2/4/0/138240_CHEMPR499-10-7b.jpg)
ResearchMolecular necklace with record 24 positive charges made
Supercharged catenane squeezes 24 positive charges into five-ring interlocked system
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ResearchRound-the-ring catalysis makes cyclic peptides chiral
Classic hydrogenation catalyst installs multiple stereocentres one by one to create small amino acid rings as single enantiomers
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NewsMerck’s €10k synthesis competition will lab test routes
Pharma company offers €10,000 in prize money for retrosynthesis challenge that will bench test finalists’ proposals
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FeatureDerek Barton and shape-shifting molecules
It’s 100 years since Derek Barton was born. Mike Sutton looks at his work developing conformational analysis
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ResearchChameleon boron switches between electrophile and nucleophile
Mida boronates can be either electrophilic or nucleophilic in rearrangement reactions
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ResearchHighly reactive carbocations tamed in bond forming reaction
Chemists harness vinyl cations for hydrocarbon synthesis and discover an unusual mechanism along the way
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ResearchAntioxidant repair keeps radical reaction running
Repurposed antioxidant’s mechanism-mending properties make tough alkene alkylation possible
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ResearchTextbook aromatic substitution mechanism overthrown
Established intermediate in nucleophilic aromatic substitution found to be a rare exception rather than the rule