A SIMPLE, EFFICIENT PREPARATION OF 1,1-BIS(TRIMETHYLSILOXY)-1,3-BUTADIENE
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Welmaker, Gregory S.
p. 595 - 597
(2007/10/02)
Bis(trimethylsiloxy)-1,1 butadiene-1,3 et trimethylsilyl-4 butene-2 oate de trimethylsilyle: preparations et reactions avec benzaldehyde
The preparation of 4-trimethylsilyl-2-butenoate trimethylsilyl ester and 1,1-bis(trimethylsiloxy)-1,3-butadiene are described.The latter silyl derivative reacts with benzaldehyde in the presence of ZnBr2 in THF to give exclusively γ-substituted product (E configuration) in high yield.The fluoride ion catalyzed reaction affords predominantly α-alkylated compounds.
Bellassoued, M.,Ennigrou, R.,Gaudemar, M.
p. 149 - 158
(2007/10/02)
SILYLCETENES ACETALS ISSUS D'ACIDES α,β-ETHYLENIQUES: PREPARATIONS ET APPLICATIONS EN SYNTHESE
The preparation of bis(trimethylsilyl)butadienyl acetal(I) and bis(trimethylsilyl)methylbutadienyl acetal (II) is reported; compound I reacts with phenyl aldehyde and titanium chloride to give linear and branched isomers of hydroxyacids.
Bellassoued, M.,Gaudemar, M.
p. C21 - C22
(2007/10/02)
Halogenated Ketenes. 37. The Synthesis of Pyranones Utilizing the (4 + 2) Cycloaddition of Ketenes and Siloxy Dienes
The reaction of diphenyl-, dichloro-, and chloroketenes with several siloxy dienes results in (4 + 2) and/or (2 + 2) cycloaddition products depending primarily on substitution in the diene.The (4 + 2) cycloaddition products are easily hydrolyzed to pyranones.These results are discussed in terms of a dipolar intermediate.
Brady, William T.,Agho, Michael O.
p. 501 - 506
(2007/10/02)
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