Tetryl‐Tetrylene Addition to Phenylacetylene
نویسندگان
چکیده
منابع مشابه
Enantio and diastereoselective addition of phenylacetylene to racemic α-chloroketones.
In this report, we have presented the first diastereoselective addition of phenylacetylene to chiral racemic chloroketones. The addition is controlled by the reactivity of the chloroketones that allowed the stereoselective reaction to be performed at -20 °C. Chiral racemic chloroketones are used in the reaction. By carefully controlling the temperature and the reaction time we were able to isol...
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A series of Schiff base ligands were synthesized from (1R)-camphor. Under the optimal conditions, (+)-SBAIB-a, 10 was found to be an excellent catalyst for the enantioselective addition of phenylacetylene to various aldehydes without utilizing either achiral additives or Ti(O(i)Pr)(4). This approach yielded (R)-propargylic alcohols in extremely high yields (up to 99%) and excellent enantioselec...
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A dinuclear ruthenium catalyst with a rigid anthracene spacer shows excellent regio- and stereo-selectivity in the atom-economic addition of aliphatic carboxylic acids to phenylacetylene, producing exclusively anti-Markovnikov enol-esters with high E/Z ratios of the isomers.
متن کاملReadily available sulfamide-amine alcohols for enantioselective phenylacetylene addition to aldehydes in the absence of Ti(O(i)Pr)4.
Ephedrine-derived sulfamide-amine alcohol 3 was found to be an effective catalyst for the asymmetric phenylacetylene addition to aldehydes at room temperature without using Ti(O(i)Pr)4 and Zn(OTf)2. It afforded the propargylic alcohols in high yields (up to 99%) and good enantioselectivities (up to 84% ee), which were much higher than that based on N-methylephedrine under the same reaction cond...
متن کاملUtilization and Addition Sugars to Ruminants Rations
Responses to sugars in dry or liquid formvary from study to study. When fed in proper amounts, sugars should not depress ruminalpH, and there is some evidence that they actuallyhelp toprevent a drop in pH after consuming largemeals of concentrate by maintaining a highernumberoflactate-fermenting bacteria. Adding sugars doesprioritize the need for rumen degraded protein (RDP).we all know, sugars...
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ژورنال
عنوان ژورنال: Chemistry – A European Journal
سال: 2021
ISSN: 0947-6539,1521-3765
DOI: 10.1002/chem.202005119