Mixtures of Z- and E-1-bromo-1,3-butadiene in which the E- or Z- isomer predominates have been obtained in good yields by treating a mixture of Z- and E- 1,4-dibromo-2-butene (90% Z-isomer) or pure E-1,4-dibromo-2-butene, respectively, with powdered potassium hydroxide in ...
An alternate route to these two optically active bis-epoxides 5 and 23 was also examined, namely the asymmetric dihydroxylation of 1,4-pentadiene and 1,5-hexadiene followed by selective sulfonylation and epoxide formation. The asymmetric reaction produces a nearly 1:1 mixture of optically active ...
with more ether and carefully quenched with H2O. The ether layer was washed with brine and dried with MgSO4. Benzene was added and the ether was removed leaving the bromide, i.e., 5-(2,5,5-trimethyl-3-oxo-cyclopenten-1-yl)-3-methyl-2,4-pentadiene-1-bromi de in benzene (230 mls....
The first is a ring contraction to 4-azido-2-cyano-4-cyclopentene-1,3-diones, and the second is the cleavage of these intermediates to two molecules of the corresponding cyanoketenes. This reaction is particularly useful for the synthesis of......
Functional Monomers and Polymers. LXXXIII. Synthesis of Optically Active Polymers from trans- and cis-2-Methyl-1,3-pentadienes by Asymmetric Inclusion Polymerization in Deoxycholic Acid CanalsPolymer Journal, official journal of the Society of Polymer Science, Japan publishes high quality papers in all...
Functional Monomers and Polymers. XXXIX. Synthesis of Optically Active Poly(trans-2-methylpentadiene) by Asymmetric Inclusion Polymerization in Deoxycholic Acidstereochemistry (general, optical resolutionpyrrole derivativesPolymer Journal, official journal of the Society of Polymer Science, Japan publishes high...
Jung M E,Kretschik O.Enantiospecific total synthesis of L-2‘,3‘-dideoxyisonucleosides via regioselective opening of optically active C2-symmetric1,4-pentadiene bis-epoxide1. Journal of Organic Chemistry . 1998Jung M E,Kretschik O.Enantiospecific total synthesis of L-2', 3'-dideoxyiso...
3- (3 - / (2R) or (2S) -exobicyclo [2.2.1] hept-2-yloxy] -4- methoxyphenyl) pentadiene\nnitrile which are conventionally hydrated to form 3- (3 - / (2R) or (2S) -exobicyclo [2.2.1] hept-2-yloxy] -4-\nthe methoxyphenyl) glutaramide, which is then cyclized in the ...