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7-Methyl-2,4-octadiene

Acetoxy-l,7-octadiene (40) is converted into l,7-octadien-3-one (124) by hydrolysis and oxidation. The most useful application of this enone 124 is bisannulation to form two fused six-membered ketonesfl 13], The Michael addition of 2-methyl-1,3-cyclopentanedione (125) to 124 and asymmetric aldol condensation using (5)-phenylalanine afford the optically active diketone 126. The terminal alkene is oxidi2ed with PdCl2-CuCl2-02 to give the methyl ketone 127 in 77% yield. Finally, reduction of the double bond and aldol condensation produce the important intermediate 128 of steroid synthesis in optically pure form[114]. [Pg.442]

From West Indian lime oil, a trace low Foiling constituent, 1-methyl-1,3-(or 1,5 /74< 5 -3 7- -cyclohexadiene has been characterized (27). This compound, which possesses an intense and characteristic lime aroma, was later confirmed to be the 1,3-isomer [1489-56-1] (11). This compound can easily be made in a biomimetic way through the reaction of citral [5392-40-5] (3,7-dimethyl-2,6-octadienal) with citric acid (28,29). [Pg.309]

Bei der Hydroaluminierung von Alkinen tritt die Oligomerisierung oft bereits bei nied-rigeren Temperaturen in den Vordergrund. So erhalt man z.B. aus 3,3-Dimethyl-l-phe-nyl-butin (I) und Bis-[2-methyl-propyl]-aluminiumhydrid (1 1) bei 50° 94% d.Th. cis-3,3-Dimethyl-l-phenyl-buten-(l) (II)5 neben 6% d.Th. trans,trans-2,2,7,7-Tetramethyl-4,5-diphenyl-octadien-(3,5) (III) ... [Pg.64]

Alkin-ole werden ebenfalls selektiv zu Alken-olen reduziert (s. a. Bd. V/lc, S. 467). So erhalt man z. B. aus 5-Hydroxy-5-methyl-hexin-(l)-en-(3) an einer Kupfer/Silber-Ka-thode in Athanol/Natriumcarbonat 80-90% d.Th. 5-Hydroxy-5-methyl-hexadien-(l,3)2. Dagegen tritt beim 2,7-Dihydroxy-2,7-dimethyl-octadiin-(3,5) an einer Kupfer-Kathode in Athanol/Natronlauge gleichzeitig Wasser-Abspaltung und Isomerisierung ein und man gewinnt 7-Hydroxy-2,7-dimethyl-octadien-(2,4) (39% d.Th. Kp2 70-720)3 ... [Pg.577]

Oxepanes have been obtained by the iodoetherification of unsaturated alcohols using bis(5 / -collidine)iodine(I) hexafluorophosphate <96JOC5793>. Thus 6-hepten-l-ol affords 2-iodomethyloxepane in 95% yield. A similar reaction with, for example, (3Z,6Z)-3,6-octadien-l-ol affords 2-(iodomethyl)-2-methyl-4-oxepane. [Pg.323]

Methyl-2-methoxypropane, b572 7 -Methyl-3 -methylene-1,6-octadiene, m467 1 -Methyl-4-( 1 -methylethenyl)cyclohexane, d736... [Pg.271]

Hydroarylation of alkenes is applied to achieve step-growth co-polymerization of aromatic ketones and ct,c< -dienes such as 3,3,6,6-tetramethyl-3,6-disila-l,7-octadiene and 1,3-divinyltetramethyldisiloxane. Co-polymerization of acetophenone and 3,3,6,6-tetramethyl-3,6-disila-l,7-octadiene is catalyzed by Ru species which has been previously activated by treatment with styrene, and a significantly high molecular weight co-polymer, co-poly(3,3,6,6-tetra-methyl-3,6-disila-l,8-octanylene/2-acetyl-l,3-phenylene), is obtained (Scheme 21 ).166... [Pg.245]

Cyclopolymerization of Nonconjugated Dienes. Cyclopolymerization is an addition polymerization that leads to introduction of cyclic structures into the main chain of the polymer. Nonconjugated dienes are the most deeply studied monomers for cyclopolymerization and for cyclocopolymerizations with alkene monomers 66 In general, (substituted and unsubstituted) dienes with double bonds that are linked by less than two or more than four atoms cannot undergo efficient cyclization and result in crosslinked materials.12 In fact, efficient cyclopolymerization processes have been described, for instance, for a,oo-dienes like 1,5-hexadiene, 2-methyl-l,5-hexadiene, 1,6-heptadiene, and 1,7-octadiene,67 73 which lead to formation of homopolymers and copolymers containing methylene-1,3-cycloalkane units. [Pg.26]

The procedure worked also with 1,3-octadiene and with isoprene which produced methyl isopropyl ketone in 80-85% yield. [Pg.552]

Gas chromatographic analysis of the product (Hewlett-Packard fused silica, cross-linked methyl silicone capillary column, 25 m x 20 mm, column temperature 100-270°C, injection temperature 250°C) shows that the product is over 99% chemically and isomerically pure, (Z,E)-l-Phenyl-l,3-octadiene shows the following spectral properties IR (neat) cm 1640, 1595, 1490, 985 ... [Pg.195]

Oxidative cyclisation of 1,6-dienes to trani-2,6-bis(hydroxyl-methyl)-tetrahy-dropyranyl-diols was effected by RuClj/aq. Na(lO )/CH3CN-EtOAc/0°C 1,6-heptadiene (1) and 7-methyl-l,6-octadiene (2) were so oxidised (Fig. 3.13 cf. mech. Ch. 1) [184],. [Pg.190]

Fig. 16.2 Flavour dilution (FD) chromatogram obtained by application of aroma extract dilution analysis on an extract prepared from parsley leaves. The odorants were identified as 1 methyl 2-methylbutanoate, 2 myrcene, 3 l-octen-3-one, 4 (2)-l,5-octadien-3-one, 5 2-isopropyl-3-me-thoxypyrazine, 6p-mentha-l,3,8-triene, 71inalool, 8 2-sec-butyl-3-methoxypyrazine, 9 (.Z)-6-dece-nal, 10 / -citronellol, 11 ( , )-2,4-decadienal, 12 / -ionone, 13 myristicin, 14 unknown. RI retention index. [30, 31]... Fig. 16.2 Flavour dilution (FD) chromatogram obtained by application of aroma extract dilution analysis on an extract prepared from parsley leaves. The odorants were identified as 1 methyl 2-methylbutanoate, 2 myrcene, 3 l-octen-3-one, 4 (2)-l,5-octadien-3-one, 5 2-isopropyl-3-me-thoxypyrazine, 6p-mentha-l,3,8-triene, 71inalool, 8 2-sec-butyl-3-methoxypyrazine, 9 (.Z)-6-dece-nal, 10 / -citronellol, 11 ( , )-2,4-decadienal, 12 / -ionone, 13 myristicin, 14 unknown. RI retention index. [30, 31]...
The biotransformation of linalool by Botrytis cinerea has also been described [60]. After addition of linalool to botrytised must, a series of transformation products was identified (E)- (49) and (Z)-2,6-dimethyl-2,7-octadiene-l,6-diol (48), trans- (76) and cw-furanoid linalool oxide (77), trans- (78) and c/s-pyranoid linalool oxide (79) and their acetates (80, 81), 3,9-epoxy-p-menth-1 -ene (75) and 2-methyl-2-vinyltetrahydrofuran-5-one (66) (unsaturated lactone), Fig. (11). Quantitative analysis however, showed that linalool was predominantly (> 90%) metabolised to ( )-2,6-dimethyl-2,7-octadiene-l,6-diol (49) by B. cinerea. The other compounds were only found as by-products in minor concentrations. [Pg.142]

Octadiene l-Acetoxy-3-fluoro-methyl-7-methyl- ElOa. 424 (OH -> F)... [Pg.694]


See other pages where 7-Methyl-2,4-octadiene is mentioned: [Pg.49]    [Pg.355]    [Pg.485]    [Pg.620]    [Pg.2602]    [Pg.79]    [Pg.713]    [Pg.1673]    [Pg.50]    [Pg.294]    [Pg.295]    [Pg.295]    [Pg.308]    [Pg.158]    [Pg.125]    [Pg.518]    [Pg.916]    [Pg.274]    [Pg.717]    [Pg.54]    [Pg.63]    [Pg.90]    [Pg.188]    [Pg.190]    [Pg.184]    [Pg.1030]    [Pg.767]    [Pg.1153]    [Pg.163]    [Pg.280]    [Pg.78]    [Pg.194]    [Pg.235]    [Pg.35]    [Pg.752]    [Pg.138]    [Pg.667]    [Pg.667]    [Pg.713]    [Pg.677]   
See also in sourсe #XX -- [ Pg.21 , Pg.271 ]




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1,7-Octadiene

2,4-Octadienal

2-Methyl-6-methylene-2,7-octadien

4.6- Octadien

7-Methyl-3 -methylene-1,6-octadiene

7-Methyl-l,6-octadiene

Octadienes 1,7-octadiene

Octadienes—

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