1,721,201 research outputs found
"Regio- and Stereoselectivity of the Addition Reactions of Nucleophiles to the Diastereoisomeric D-Allal- and D-Galactal-Derived Allyl Epoxides and Aziridines"
No full textStereochimica dell'apertura dell'anello epossidico del 3-fenil-2,3-epossicicloesanone in ambiente acido
No full textNEW OXIDATIVE-DEGRADATION OF ARYLETHANOLS AND ARYLACETIC ACIDS BY MEANS OF ACTIVE MANGANESE OXIDE (GAMMA-MNO2)
No full textSOLVOLYSIS OF BENZYLIC ALCOHOLS - MECHANISM AND STEREOCHEMISTRY OF THE ACID METHANOLYSIS OF DIASTEREOISOMERIC TRANS-1,2,3,4,4A,10A-HEXAHYDROPHENANTHREN-9-OL AND 4-TERT-BUTYL-1-PHENYLCYCLOHEXANOL
No full textThe solvolysis (MeOH) of representative benzocondensed and cyclohexanic diastereoisomeric benzylic alcohols (title compounds) has been studied. Both systems afford mixtures of products (methyl ethers) arising from inversion or retention of configuration on the benzylic reaction centre, with an increase in the retention product on addition of a salt (LiClO4). The results obtained do not appear to support the previous hypothesis of the intermediacy in these systems of fully developed benzylic carbenium ions, pseudoaxially attacked by the nucleophile. A rationalization based on the ion-dipole pair mechanism, implying the intermediacy of different benzylic carbocationic species, is alternatively proposed
Sintesi Stereoselettiva di Tetraidrofurani 1,2,3-Trisostituiti mediante contrazione di anello dei Glicali
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SYNTHESIS AND REACTIVITY OF BENZYLIC EPOXIDES DERIVED FROM 1,2,3,9,10,10A-HEXAHYDROPHENANTHRENE - SEARCH FOR A UNIFIED MECHANISM FOR THE RING-OPENING OF 2-ARYLOXIRANES
No full textEFFECT OF THE 9-METHYL SUBSTITUENT ON THE CHEMICAL BEHAVIOR UNDER ACID CONDITIONS OF THE DIASTEREOISOMERIC 9,10-OXIDES DERIVED FROM TRANS-1,2,3,4,4A,10A-HEXAHYDROPHENANTHRENE
No full textEFFECT OF AN ALKYNYL GROUP ON THE REGIOCHEMISTRY AND STEREOCHEMISTRY OF THE RING-OPENING OF 1,2-EPOXIDES - RING-OPENING REACTIONS OF 1-ETHYNYL-1,2-EPOXYCYCLOHEXANE
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