Trans-2- alcohols

BASE-INDUCED REARRANGEMENT OF EPOXIDES TO ALLYLIC ALCOHOLS trans-Pinocarveol,... [Pg.55]

BASE-INDUCED REARRANGEMENT OF EPOXIDES T 0 ALLYLIC ALCOHOLS trans- PINOCARVEOL... [Pg.17]

It has been observed that the major product obtained on reduction with either lithium aluminum hydride or sodium borohydride is the trans alcohol (trans/cis ==9 1). [Pg.443]

The standard preparation of t/ms-[Rhpy4Cl2]+ is due to Delepine,784,785 who noticed that reaction of pyridine with [RhCl6]3- leads to mixtures of [Rhpy3Cl3] isomers, but that in the presence of primary or secondary alcohols, trans-[Rhpy4Cl2]Cl is formed. (The role of the alcohol in this reaction is discussed in more detail in Section 48.6.2.5.iii.) Far IR spectra (pyridine ring vibrations, Rh—N and Rh—Cl stretches) of the fac and mer isomers of [Rhpy3Cl3] confirmed the earlier isomer assignment.786... [Pg.995]

Benzyl Alcohol trans-2-trans-4-Decadienal 2,4-Heptadienal Methyl Ethyl Ketone 2-Nonanone... [Pg.145]

Starting from secondary bis-homoallylic alcohols, tran.s-2,5-tetrahydrofurans are mainly produced in moderate yield. It is worth mentioning that the same results are obtained by using a catalytic amount of rhenium(VII) oxide and tert-butyl hydroperoxide as co-oxidant in dichlo-romethane140-142. [Pg.289]

The wide distribution of PKSs in the microbial world and the extreme chemical diversity of their products do in fact result from a varied use of the well-known catalytic domains described above for the canonical PKS systems. Taking a theoretic view of polyketide diversity, Gonzalez-Lergier et al. (41) have suggested that even if the starter and extender units are fixed, over 100,000 linear heptaketide structures are possible using only the 5 common reductive outcomes at the P-carbon position (ketone, (R- or S-) alcohol, trans-double bond, or alkane). Recently, it has become apparent that even this does not represent the upper limit for polyketide diversification. To create chemical functionalities beyond those mentioned above, nature has recruited some enzymes from sources other than fatty acid synthesis (the mevalonate pathway in primary metabolism is one example) not typically thought of as type I PKS domains. Next, we explore the ways PKS-containing systems have modified these domains for the catalysis of some unique chemistries observed in natural products. [Pg.1530]

CgHj CH CH(CH2)7C00H ibid CgH. CH CH(CH2)70H ibid CgHi CH CH(CH2)iiCOOH ibid trans-9 octadecenoic acid cis-9 octadecenoic acid trans-8 octadecenyl alcohol cis-8 octadecenyl alcohol trans-13 docosenoic acid CIS-13 docosenoic acid elaidic acid oleic acid elaidyl alcohol oleyl alcohol brassidic acid erucic acid... [Pg.407]

Removal of the acetonide blocking group and treatment with base then gave the epoxyl alcohol trans-(5R)-40, which was converted to 5-epi-6-epi-LTA4 methyl ester by the same sequence of reactions as for LTA4 methyl ester. [Pg.165]

The reaction of allyl alcohol, 2-methyl allyl alcohol and crotyl alcohol (trans cis= 4.45 1) were reacted with hydrogen peroxide at 30 °C using methanol assolvent, and the results are shown in Figures 1-3. It is apparent that the order of reactivity is cis-crotyl alcohol > trans-crotyl alcohol > allyl alcohol > 2 methylallyl alcohol. The latter alcohol was not particularly reactive and this indicates that substition at the 2-position inhibits the reaction significantly. [Pg.537]

Reactant trans/cis reaction time / h conversion / % trans-crotyl cis-crotyl alcohol alcohol trans-oxirane selectivity / % cis-oxirane ether diols triol... [Pg.539]

In cyclohexanones, the pyramidalisation is similarly greater in the radical anion 7.155 than it was in the ketone 5.138 (see p. 230), thus explaining the high degree of synthetically useful selectivity for the formation of the equatorial alcohol trans-1.157 from the ketone 7.156, as a result of axial protonation.1068... [Pg.396]

Myrtenol (203 X = CH2OH) may be obtained most efficiently from the more stable secondary allylic alcohol (+)-trans-pinocarveol (30 enantiomer) via bromination with PBra to the rearranged bromide (203 X = CH2Br) [(30) (203 X = CH20H)/85 15] ester thermolysis and isomerization-oxidation were less effective, and the direct acid-catalysed isomerization was not observed. Intramolecular cyclization of (206), which is readily synthesized via trifluoroacetic anhydride cyclization of 4-methylcyclohex-3-enylacetic acid to (186), affords (207) which is cleaved to (208 X = NH2) in a synthesis of ( )-a-... [Pg.70]

Lignins are derived from the glucosides of irans-p-coumaryl alcohol, trans-coni-feryl alcohol and frans-sinapyl alcohol (Table 50). These compounds are incorpo-... [Pg.437]

Monocotyledons trans-Coniferyl alcohol, trans-sinapyl alcohol and trans-p-coumaryl alcohol... [Pg.439]

Unique to E-vinyl derivatives of 9-BBN is their Grignard-like addition to aldehydes [6] to afford stereodefined alcohols. trans-E-Vinyl-9-BBN synthesis via dehydroborylation [7] process is extended to the synthesis of trans-2-tnmeth-ylsilyl vinylborane [8]. trans-2-Trimethylsilylvinyl-9-BBN adds cleanly to aldehydes (Eq. 6.17) to provide pure frans-3-trimethylsilyl(TMS) allylic alcohols in excellent yields (Table 6.18) [8]. ... [Pg.176]

Benzyl ciimamate, iso-butyl alcohol, iso-amyl alcohol, furfural, methyl eugenol, iso-asarone, P-phenyl ethyl alcohol, trans-linalool oxide, elemicine... [Pg.29]

Fig. 1. Absorption spectra of a -trans retinol (vitamin A] alcohol, trans 3,4-didehydroretinol (vitamin A2 alcohol, ) in methanol...

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