- A flexible route toward polypropylene model compounds of various tacticities
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This paper reports the flexible synthesis of 2,4,6,8,10-pentamethylundecane (PMU) as well as a chromatographic method for the separation of its diastereoisomers. This strategy offers a unique opportunity to accede to three model compounds of polypropylene (PP) of different tacticities (i.e., isotactic, syndiotactic, and atactic PP). Georg Thieme Verlag Stuttgart.
- Drooghaag, Xavier,Henry, Gatan,Marchand-Brynaert, Jacqueline
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- Synthetic Method to Form 2,2′-Bis(naphthoquinone) Compounds
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We have discovered a transition-metal-free approach to the synthesis of 2,2′-bis(naphthoquinones) using a Diels-Alder reaction of conjugated ketene silyl acetals with benzoquinone. Its monomer analogue can also be synthesized by simply increasing the equivalents of benzoquinone.
- Jha, Vishwajeet,Goyal, Navneet,Stevens, Cheryl K.,Stevens, Edwin,Sridhar, Jayalakshmi
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- An entry to non-racemic β-tertiary-β-amino alcohols, building blocks for the synthesis of aziridine, piperazine, and morpholine scaffolds
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A method for the preparation of enantiopure β-tert-amino alcohols bearing a tetrasubstituted C-stereocenter, as well as their conversion into selected medicinally privileged heterocyclic systems (morpholines, aziridines, piperazines) is reported. These co
- Narczyk, Aleksandra,Stecko, Sebastian
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supporting information
p. 5972 - 5981
(2020/08/21)
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- Iridium-catalyzed asymmetric hydrogenation of 3,3-disubstituted allylic alcohols in ethereal solvents
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Ir-phosphinomethyl-oxazoline complexes have been identified as efficient, highly enantioselective catalysts for the asymmetric hydrogenation of 3,3-disubstituted allylic alcohols and related homoallylic alcohols. In contrast to other N,P ligand complexes, which require weakly coordinating solvents, such as dichloromethane, these catalysts perform well in more ecofriendly THF or 2-MeTHF. Their synthetic potential was demonstrated with the formal total synthesis of four bisabolane sesquiterpenes. Particularly high enantioselectivity values in the asymmetric hydrogenation of 3,3-disubstituted allylic alcohols and related homoallylic alcohols have been achieved with Ir-phosphinomethyloxazoline catalysts. In contrast to other N,P-ligand complexes, which require weakly coordinating solvents, such as CH 2Cl2, these catalysts perform well in more ecofriendly THF or 2-MeTHF (see scheme; CODa =a 1,5-cyclooctadiene). Copyright
- Bernasconi, Maurizio,Ramella, Vincenzo,Tosatti, Paolo,Pfaltz, Andreas
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supporting information
p. 2440 - 2444
(2014/03/21)
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- Esterase-mediated synthesis of optically active GABA analogues containing a stereogenic all-carbon quaternary carbon atom
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Esterase from Horse Liver (HLAP) was able to hydrolyze a series of linear and cyclic β,β-dialkyl-γ-nitroesters, in spite of the well-known reluctance of hydrolytic enzymes to recognize and transform hindered substrates, such as those possessing a stereoge
- Felluga, Fulvia,Ghelfi, Franco,Pitacco, Giuliana,Roncaglia, Fabrizio,Valentin, Ennio,Venneri, Cesare Daniele
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experimental part
p. 2183 - 2191
(2010/10/03)
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- HOMOALLYL ALCOHOLS USEFUL AS FRAGRANCES
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Branched, highly-substituted C9-C13 homoallyl alcohols of formula (I) in which R1 and R2 are selected from H or Me and R3 is selected from H, Me and Et. The compounds are useful in fragrance applications in which a floral note is desired.
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Page/Page column 5-6
(2009/06/27)
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