- POLYPRENOLS AND HYDROXYLATED LYCOPERSENES FROM MYRIOPHYLLUM VERTICILLATUM
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Key Word Index-Myriophyllum verticillatum; Haloragaceae; terpenoids; polyprenols; hydroxy lycopersene; iso-hydroxy lycopersene.In a chemical investigation of the aquatic plant Myriophyllum verticillatum three polyprenols and two monohydroxy lycopersenes have been characterized on the basis of their chemical and physical features.The novel compounds hydroxy lycopersene and iso-hydroxy lycopersene may be easily included in the carotenoid biosynthetic pathway.
- Lanzetta, Rosa,Monaco, Pietro,Previtera, Lucio,Simaldone, Antonella
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- METHOD FOR THE PRODUCTION OF PHYTOFLUENE
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The invention relates to a method for the production of phytofluene of formula I, where a) a phosphonium salt of formula II is condensed with an aldehyde of formula III to give an acetal of formula IV in a Wittig reaction, b) the condensation product of formula IV undergoes an acid-catalysed acetal hydrolysis to give the aldehyde of formula V and c) V is condensed with a phosphonium salt of formula VI to give phytofluene in a further Wittig reaction, whereby the groups R1, R2, R7, X- and Y- have the meanings given in the description.
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Page/Page column 11
(2010/02/11)
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- Formation of symmetrical alkenes by homocoupling of metallated sulfones under nickel catalysis
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Summary -Allylic sulfones undergo a coupling reaction with organometallic compounds (Mg or Li) not only with copper catalysts but also with iron or nickel salts. With 7,7-disubstituted allylic sulfones and also saturated aliphatic sulfones, however, another reaction was observed whereby two molecules of the starting sulfone are coupled to give symmetrical alkenes. The scope of this reaction was investigated. Elsevier.
- Gai, Yonghua,Julia, Marc,Jean-Noe,Verpeaux
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p. 805 - 816
(2007/10/03)
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- Syntheses with Sulfones L : Preparation of β-Hydroxysulfones through the Combined Oxidative Desulfonylation/Condensation Reaction of Sulfonyl Anions. Application to Terpene Synthesis.
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The oxidative desulfonylation of primary sulfonyl anions with the molybdenum peroxide reagent, MoO5.Py.HMPA, leads directly to β-hydroxysulfones through condensation of the starting α-sulfonyl anion with the aldehyde formed in situ.Symmetrical polyenes such as (Z)-12-dehydrosqualene and (Z)-16-phytoene have been obtained in three steps in > 87percent stereoslectivity from the corresponding β-hydroxysulfones.
- Capet, M.,Cuvigny, T.,Penhoat, C. Herve du,Julia, M.,Loomis, G.
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p. 6273 - 6276
(2007/10/02)
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- Synthese d'olefines et de polyenes par doublement d'anions α-sulfonyles en presence de sels de nickel
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The lithium or magnesium derivatives of allyl, benzyl and alkyl sulphones are converted efficiently by a catalytic amount of nickel(II) acetylacetonate into symmetrical olefins in THF at 60 deg C.Thus, phytoene was obtained in a 70percent yield from geranylgeranylsulphone.
- Julia, Marc,Verpeaux, Jean-Noel
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p. 2457 - 2460
(2007/10/02)
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