Base‐Free Iron Catalyzed Transfer Hydrogenation of Esters Using EtOH as Hydrogen Source
作者:Ronald A. Farrar‐Tobar、Bartosz Wozniak、Arianna Savini、Sandra Hinze、Sergey Tin、Johannes G. de Vries
DOI:10.1002/anie.201810605
日期:2019.1.21
Herein, we report on the use of the iron pincer complexIron‐MACHO‐BH, in the base‐free transferhydrogenation of esters with EtOH as a hydrogen source. More than 20 substrates including aromatic and aliphatic esters and lactones were reduced affording the desired primary alcohols and diols with moderate to excellent isolated yields. It is also possible to reduce polyesters to the diols with this method
Stereoselective microbial reduction of a racemic tetralone
申请人:Pfizer Products Inc.
公开号:EP0997535A2
公开(公告)日:2000-05-03
The present invention relates to processes for carrying out the following stereoselective microbial reduction of a racemic tetralone:
which comprises: contacting a compound of formula (I) with a microorganism, or an enzyme reduction system capable of accomplishing the subject reduction comprising an enzyme derived from said microorganism and a co-factor for said enzyme, and incubating the resulting mixture under conditions sufficient to yield the (4R) tetralol of formula (II) and to leave substantially unreacted the (4S) tetralone of formula (V) or "chiral tetralone." The chiral tetralone can be used in the synthesis of sertraline. The subject process further optionally comprises the separation of the (4S) tetralone of formula (V) from the (4R) tetralol of formula (II). The (4R) tetralol can be recycled to produce the compound of formula (I) and the subject process repeated to result in even more of the desired (4S) tetralone of formula (V).
Gel coat compositions and/or components thereof that have low viscosity characteristics while also incorporating relatively high molecular weight resin material. In representative embodiments, this is achieved by using a curable polyester resin with low polydispersity in the gel coat compositions and/or one or more components thereof. In preferred embodiments, such resin material is used to prepare one or more color components that can be readily blended with one or more other gel coat resin components to form gel coat compositions. These compositions can be cured to form gel coats. By blending the components according to recipes, a wide range of different gel coat compositions with custom color or other visual appearance can be prepared on demand from a limited inventory of color components.