Chiral diphosphorus compounds and their transition metal complexes
申请人:Meseguer Benjamin
公开号:US20050080047A1
公开(公告)日:2005-04-14
The present invention relates to chiral diphosphorus compounds and their transition metal complexes, to a process for preparing chiral diphosphorus compounds and their transition metal complexes and also to their use in asymmetric syntheses.
Intramolecular dehydration of biomass-derived sugar alcohols in high-temperature water
作者:Aritomo Yamaguchi、Natsumi Muramatsu、Naoki Mimura、Masayuki Shirai、Osamu Sato
DOI:10.1039/c6cp06831f
日期:——
The intramolecular dehydration of biomass-derivedsugaralcohols D-sorbitol, D-mannitol, galactitol, xylitol, ribitol, L-arabitol, erythritol, L-threitol, and DL-threitol was investigated in high-temperature water at 523–573 K without the addition of any acid catalysts. D-Sorbitol and D-mannitol were dehydrated into isosorbide and isomannide, respectively, as dianhydrohexitol products. Galactitol was
Chirale Diphosphorverbindungen und deren Übergangsmetallkomplex
申请人:Bayer Chemicals AG
公开号:EP1400527A1
公开(公告)日:2004-03-24
Die vorliegende Erfindung betrifft chirale Diphosphorverbindungen und deren Übergangsmetallkomplexe, ein Verfahren zur Herstellung chiraler Diphosphorverbindungen und deren Übergangsmetallkomplexe sowie deren Verwendung in asymmetrischen Synthesen.
Chiral monophosphorus compounds and their transition metal complexes
申请人:——
公开号:US20040127430A1
公开(公告)日:2004-07-01
The present invention relates to chiral monophosphorus compounds and their transition metal complexes, to a process for preparing chiral monophosphorus compounds and their transition metal complexes and also to their use in asymmetric syntheses.
Kinetic analyses of intramolecular dehydration of hexitols in high-temperature water
作者:Aritomo Yamaguchi、Naoki Mimura、Masayuki Shirai、Osamu Sato
DOI:10.1016/j.carres.2019.107880
日期:2020.1
Intramolecular dehydration of the biomass-derived hexitols D-sorbitol, D-mannitol, and galactitol was investigated. These reactions were performed in high-temperature water at 523-573 K without added acid catalyst. The rate constants for the dehydration steps in the reaction networks were determined at various reaction temperatures, and the activation energies and pre-exponential factors were calculated from Arrhenius plots. The yield of each product was estimated as a function of reaction time and temperature using the calculated rate constants and activation energies. The maximum yield of each product from the dehydration reactions was predicted over a range of reaction time and temperature, allowing the selective production of these important platform chemicals.