[reaction: see text] An efficient oxidative lactonization of 1,4-diols in acetone is accomplished by the well-defined ruthenium catalyst, whose bifunctional nature underlies the high efficiency as well as unique chemo- and regioselectivity of the reaction which provides a rapid access to gamma-butyrolactones including flavor lactones hinokinin, and muricatacin.
Natural acetylenes. Part XVIII. Some allenic polyacetylenes from basidiomycetes
作者:R. E. Bew、J. R. Chapman、Ewart R. H. Jones、B. E. Lowe、G. Lowe
DOI:10.1039/j39660000129
日期:——
The isolation, characterisation, and structure determination of ten polyacetylenes, including seven new allenic-diactylenes, from five Basidiomycete fungi (Cortinellus berkeleyanus, Odontia bicolor, Flammula sapinea, Daedalea juniperina, and the unidentified fungus B285) are described. The new allenic-diacetylenes are (a) HCC·CC·CHCCH·[CH2]n·OH (n= 1, 3, and 4); (b) HCC·CC·CHCCH·CH(OH)·[CH2]n·OH (n=
描述了十种聚乙炔的分离,表征和结构测定,其中包括五种担子菌(Cortinellus berkeleyanus,Odontia bicolor,Flamula sapinea,Daedalea juniperina和未鉴定的真菌B285)中的十种聚乙炔,其中包括七种新的烯丙基二乙炔。新的烯丙基二乙炔为(a)HC C·C C·CH C CH·[CH 2 ] n ·OH(n = 1、3和4);(b)HC C·C C·CH C CH·CH(OH)·[CH 2 ] n ·OH(n = 2和3);(c)HC C·C C·CH C CH·CH 2 ·CH(OH)·CH 2 ·CH2 ·OH;(d)CH 3 ·CC·CC·CHCCH·CH 2 ·CH 2 ·OH。方便地纯化二醇(b; n = 2)和(c),并检查它们的异亚丙基衍生物。
Reduction of Carboxylic Acid Derivatives Using Diphenylsilane in the Presence of a Rh–PPh<sub>3</sub>Complex
Reductions of carboxylic acid derivatives by silanes in the presence of rhodium complexes were studied. Carboxylic esters were reduced to alcohols by diphenylsilane catalyzed by [RhCl(cod)]2/4PPh3 ...
Carboxylic esters were reduced to alcohols by diphenylsilane catalyzed by a Rh complex at room temperature. For example, ethyl decanoate and ethyl phenylacetate were converted to decanol and 2-phenylethanol by [ for 72 hours in 98 and 92% yields, respectively. Wilkinson's catalyst is also usable, and the reduction of ethyl decanoate finished in 6 hours at room temperature. The bromo-substitutent on
achieve effective reduction. On the other hand, each individual solvent, methanol or t-butyl alcohol, was not effective for the reduction. The procedure provided a practical method for the functional group selective reduction of esters in the presence of chloro, cyano, carboxylato, carbamoyl, carboxy or nitro groups, which can not usually be performed by lithiumaluminiumhydride.