Synthetisches Nerolidol und verwandte C15-Alkohole
作者:A. Ofner、W. Kimel、A. Holmgren、F. Forrester
DOI:10.1002/hlca.19590420729
日期:——
A number of C15 alcohols related to nerolidol have been synthesized and characterized. Gas chromatography is an efficient tool lor separation of cis-trans isomers.
已经合成和表征了许多与神经甾醇有关的C 15醇。气相色谱法是分离顺反异构体的有效工具。
�ber eine neuartige Synthese von ?-Ketoallenen durch Reaktion von terti�ren Acetylencarbinolen mit Vinyl�thern eine ergiebige methode zur darstellung des Pseudojonons und verwandter verbindungen
作者:G. Saucy、R. Marbet
DOI:10.1002/hlca.19670500423
日期:——
The novel acid-catalysed reaction of isopropenyl ether with tertiary acetylenic carbinols to give β-ketoallenes in high yields is described. Upon treatment with bases, these allenes readily undergo isomerization to conjugated dienones. This reaction sequence results in an economic synthesis of pseudo-ionones and pseudo-irones from dehydrolinalool and its homologs.
Process for producing 6-methyl-3-hepten-2-one and 6-methyl-2-heptanone
申请人:Kuraray Co., Ltd.
公开号:US05955636A1
公开(公告)日:1999-09-21
Provided are a process for producing 6-methyl-3-hepten-2-one by cross aldol condensation carried out while each continuously adding to acetone, isovaleraldehyde and an aqueous alkali containing an alkaline substance; a process for producing a 6-methyl-2-heptanone analogue represented by Formula (1): ##STR1## wherein n is an integer of 0 or 1 or more; which comprises allowing hydrogen, acetone and an aldehyde represented by Formula (2): ##STR2## wherein n is as defined above; X and Y each represents a hydrogen atom or they are coupled together to form a carbon-carbon bond; and Z and W each represents a hydrogen atom or they are coupled together to form a carbon-carbon bond; to react in the presence of an aqueous alkali containing an alkaline substance, and a hydrogenation catalyst; and a process for producing phyton or isophytol using the 6-methyl -3-hepten-2-one or the 6-methyl-2-heptanone analogue.
Über eine neue Synthese von Citral und verwandten Verbindungen
作者:G. Saucy、R. Marbet、H. Lindlar、O. Isler
DOI:10.1002/hlca.19590420624
日期:——
A new method for the preparation of α,β-unsaturated aldehydes and α,β;γ,δ-unsaturated ketones is described. The method is based upon the rearrangement of acetates of tertiary ethynyl carbinols to allenic acetates in the presence of acetic acid and silver or copper catalyst; partial conversion of the allenic acetates to diacetates takes place under the reaction conditions. In some cases enol acetates
Preparation of higher alpha, beta-unsaturated alcohols
申请人:——
公开号:US20020183565A1
公开(公告)日:2002-12-05
Higher &agr;,&bgr;-unsaturated alcohols are prepared by monoethynylation of a ketone by the NH
3
/KOH method, if desired hydrogenation of the acetylene alcohol in the presence of hydrogen over a Pd-containing thin layer catalyst, purifying distillation of the hydrogenation product, preferably in a dividing wall column with recirculation of the unreacted ketone to the ethynylation step, and, if desired, preparation of higher alcohols having in each case 5 more carbon atoms in the chain by reacting the alcohols prepared by monoethynylation and, if desired, partial hydrogenation with alkyl acetoacetatesor diketene in a Carroll reaction to form ketones and using these as starting materials for the steps ethynylation, optional hydrogenation and fractional distillation.