significant directive effect of the 2-axial hydroxy group appeared in the LiAlH4, NaBH4, and Zn(BH4)2 reduction of cyclohexanone, while the 3-axial hydroxy group exhibited a steric hindrance. The distance between the carbonyl carbon and the hydroxy group which interacts with the hydride reagent is mainly responsible for such a difference. In the reduction of Na[B(OAc)3H], both the 2- and 3-axial hydroxycyclohexanones
Synthesis of Poly(decahydro-2-naphthyl methacrylate)s with Different Geometric Structures and Effects of Side-Group Dynamics on Polymer Properties Investigated by Thermal and Dynamic Mechanical Analyses and DFT Calculations
prepared the geometric isomers of decahydro-2-naphthols as the source materials for the synthesis of poly(decahydro-2-naphthyl methacrylate)s [poly(DNMA)-I, -II, -III, and -IV] including alicyclic ester groups with different geometric structures. The geometry and conformational dynamics of the decahydro-2-naphthyl moieties were investigated by NMR spectroscopy and DFT calculations. We synthesized each
Catalytichydrogenation of 2-naphthol (NL) with the six platinum metals has been studied in t-BuOH at 80 °C and 4–5 MPa H2 pressure. Selectivities for formation of 1,2,3,- and 5,6,7,8-tetrahydro-2-naphthols (ac- and ar-TLs) have been determined by application of a kinetic equation. ar-TL was formed more predominantly than ac-TL over all the metals. The hydrogenation of ac- and ar-TLs has also been
Studies on the stereochemistry of reduction reactions on 10-R substituted trans decal-2-Ones
作者:Giorgio Di Maio、Luisa M. Migneco、Elisabetta Vecchi
DOI:10.1016/s0040-4020(01)87929-1
日期:1990.1
Relative rates kax and keq of reduction reactions of title compounds (R=H, Me, CO2Et, Cl) have been measured in three different reaction conditions (LiAlH4, LiEt3BH, NaBH4). We found that keq decreases as the substituent electronegativity increases when lithium reactants are used and that kaxincreases as the substituent electronegativity increases when sodium reactant is used. The synthesis of trans
Reaktionen mit Mikroorganismen. 11. Mitteilung. Die Reduktion und Oxydation von (±)-<i>trans</i>- und (±)-<i>cis</i>-Dekalon-(2) mit<i>Curvularia falcata</i>
作者:V. Prelog、H. E. Smith
DOI:10.1002/hlca.19590420735
日期:——
Curvularia falcata (TEHON) BOEDIJN reduziert das (±)-trans-Dekalon-(2) (I, II) zu zwei diastereomeren Paaren von enantiomeren trans-Dekalolen-(2) (III bis VI), von welchen diejenigen mit (2 S)-Konfiguration überwiegen.