Chemoenzymatic synthesis of α-halogeno-3-octanol and 4-or 5-nonanols. Application to the preparation of chiral epoxides
摘要:
A study of the microbiological reduction of different alpha-halogenoketones (4-chloro-3-octanone, 4-chloro-5-nonanone, 5-bromo-4-nonanone and 5-chloro-4-nonanone) with several strains of microorganism showed great difficulty in reducing ketone functions located in the middle of carbon chains. However, by choosing the appropriate microorganism, several enantiomerically pure diastereoisomers of the corresponding halohydrins have been obtained and were transformed into chiral epoxides. (C) 1998 Elsevier Science Ltd. All rights reserved.
Anthraquinone dyes having alkylsulfonylamino substituents
申请人:Minnesota Mining and Manufacturing Company
公开号:US05034547A1
公开(公告)日:1991-07-23
New anthraquinone dyes, free of water-solubilizing groups such as --SO.sub.3 H and --CO.sub.2 H comprise anthraquinone substituted with one or more identical or different groups of the formula --NHSO.sub.2 R, wherein R is a substituted or unsubstituted linear, branched, cyclic or polycyclic alkyl group having up to 20 carbon atoms, and wherein the remaining nuclear aromatic carbon atoms of the anthraquinone may be substituted with substituents selected from the group: alkyl; the halogens F, Cl, and Br; cyano; nitro; aminosulfonyl; arylsulfonylamino; and --NHCOQ; wherein Q is hydrogen, an alkyl, an aryl, or a heterocyclic group. These dyes have improved solubility, lowered melting point, and possess outstanding resistance to light-induced fading.