Synthesis and nucleophilic substitution of allenyl(m-nitrophenyl)iodanes as a new propynyl cation-equivalent species: synthesis of propynyl ethers, esters, and amides
申请人:University of Washington through its Center for Commercialization
公开号:US20140371493A1
公开(公告)日:2014-12-18
Methods for converting polyols are provided. The methods provided can include using a metal pincer catalyst (e.g., an iridium pincer catalyst) to remove at least one alcohol group from a polyol. The methods provided can include converting glycerol to 1,3-propanediol.
[EN] RECYCLABLE AND REWORKABLE POLYOL (S)<br/>[FR] POLYOL(S) RECYCLABLE(S) ET RÉUSINABLE(S)
申请人:ADITYA BIRLA CHEMICALS THAILAND LTD EPOXY DIV
公开号:WO2020260970A1
公开(公告)日:2020-12-30
Polyol component(s) for a recyclable polyurethane system is disclosed. The recyclable polyurethane system comprises a polyol component having a structural Formula (I), a polyol component having a structural Formula (II) or a polyol component having a structural Formula III and an isocyanate curing agent. A process(es) for preparing the polyol component having the structural Formula (I), the polyol component having the structural Formula (II) and the polyol component having the structural Formula (III) is also disclosed.
Process for the production of isopropenyl methyl ether
申请人:——
公开号:US20020042543A1
公开(公告)日:2002-04-11
Process for the production of unsaturated ethers, in particular isopropenyl methyl ether (IPM), by pyrolysis of a ketal-containing or acetal-containing mixture, in particular dimethoxypropane (DMP), in the liquid phase in the presence of an organic carboxylic acid, according to the following reaction scheme:
1
wherein R
1
=H or alkyl with 1-8 C atoms; R
2
=H, CH
3
—, C
2
H
5
—, or Cl—; R
3
=alkyl with 1-8 C atoms; R
4
=H, CH
3
—, C
2
H
5
—, or C
3
H
7
—, and R
1
and R
4
may be joined to form a 5-, 6-, or 7-membered ring. DMP is produced by the process from acetone and methanol by reaction in an acidic heterogeneous ion exchanger, the product being isolated by extraction with aqueous alkaline solution. In particular the process involves combining the IPM reaction product with the DMP reaction product, which permits the execution of a stable recycling process in which the methanol-containing streams of the IPM and DMP stages can be simultaneously extracted. The product may be isolated by the process by simple distillation of IPM from a mixture containing IPM, DMP and acetone.
Measurement of deuterium kinetic isotope effects in organic and biochemical reactions by natural abundance deuterium NMR spectroscopy
作者:Robert A. Pascal、Mary W. Baum、Carol K. Wagner、Lauren R. Rodgers、Ded Shih. Huang
DOI:10.1021/ja00281a005
日期:1986.10
Natural abundance deuteriumNMR spectroscopy is a powerful and convenient tool for the estimation of deuterium kinetic isotopeeffects in organic reactions, obviating in many cases the preparation of isotopically enriched reactants for such measurements. Determination of the primary or secondary kinetic isotopeeffects for a broad variety of reaction types are described to illustrate this technique