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rdf:type
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Description
| - Alcs. contg. HCl transform the hydroquinone redn.-products of helicenebisquinones into p-alkoxyphenols that have the alkoxyls specifically on the peripheries of the helixes. The reactions are quick, and the yields are high. Alkoxyls at the 6-position are replaced also, but only after 2 h at 60 C, not after the 5 min at 25 C sufficient to replace the peripheral hydroxyls of the hydroquinones. After the remaining inside hydroxyls of a dihydroxytetramethoxy[6]helicene prepd. by this procedure were converted into camphanates, one diastereomer crystallizes from soln., allowing an enantiomer resoln. to be carried out on a large scale. By then simply re-applying the procedure with alc. acid, a variety of resolved dihydroxytetraalkoxy[6]helicenes can be prepd. in excellent yields without resoln. procedures having to be developed for each. Similar procedures are effective when applied to a [7]carbohelicene.
- Alcs. contg. HCl transform the hydroquinone redn.-products of helicenebisquinones into p-alkoxyphenols that have the alkoxyls specifically on the peripheries of the helixes. The reactions are quick, and the yields are high. Alkoxyls at the 6-position are replaced also, but only after 2 h at 60 C, not after the 5 min at 25 C sufficient to replace the peripheral hydroxyls of the hydroquinones. After the remaining inside hydroxyls of a dihydroxytetramethoxy[6]helicene prepd. by this procedure were converted into camphanates, one diastereomer crystallizes from soln., allowing an enantiomer resoln. to be carried out on a large scale. By then simply re-applying the procedure with alc. acid, a variety of resolved dihydroxytetraalkoxy[6]helicenes can be prepd. in excellent yields without resoln. procedures having to be developed for each. Similar procedures are effective when applied to a [7]carbohelicene. (en)
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Title
| - Acidified Alcohols as Agents to Introduce and Exchange Alkoxyls on the Periphery of Helicenes
- Acidified Alcohols as Agents to Introduce and Exchange Alkoxyls on the Periphery of Helicenes (en)
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skos:prefLabel
| - Acidified Alcohols as Agents to Introduce and Exchange Alkoxyls on the Periphery of Helicenes
- Acidified Alcohols as Agents to Introduce and Exchange Alkoxyls on the Periphery of Helicenes (en)
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skos:notation
| - RIV/00216224:14310/00:00036036!RIV10-MSM-14310___
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http://linked.open...avai/riv/aktivita
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http://linked.open...avai/riv/aktivity
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http://linked.open...iv/cisloPeriodika
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http://linked.open...vai/riv/dodaniDat
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http://linked.open...aciTvurceVysledku
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http://linked.open.../riv/druhVysledku
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http://linked.open...iv/duvernostUdaju
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http://linked.open...titaPredkladatele
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http://linked.open...dnocenehoVysledku
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http://linked.open...ai/riv/idVysledku
| - RIV/00216224:14310/00:00036036
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - helicene; alkoxyl; diastereomer; separation (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...odStatuVydavatele
| - US - Spojené státy americké
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http://linked.open...ontrolniKodProRIV
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http://linked.open...i/riv/nazevZdroje
| - Journal of Organic Chemistry
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http://linked.open...in/vavai/riv/obor
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http://linked.open...ichTvurcuVysledku
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http://linked.open...cetTvurcuVysledku
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http://linked.open...UplatneniVysledku
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http://linked.open...v/svazekPeriodika
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http://linked.open...iv/tvurceVysledku
| - Paruch, Kamil
- Dreher, Spencer
- Katz, Thomas
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issn
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number of pages
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http://localhost/t...ganizacniJednotka
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