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“Large rate accelerations in aldol reaction of ortho-substituted benzaldehydes”

✍ Scribed by G. Das; E.R. Thornton

Book ID
108381950
Publisher
Elsevier Science
Year
1992
Tongue
French
Weight
32 KB
Volume
33
Category
Article
ISSN
0040-4039

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The E/Z ratios of the stilbenes 1 formed in the Wittig reaction of ortho-halo substituted benzyltriphenylphosphonium salts 2 and benzaldehydes 3 were determined. It was found that there is a co-operative effect of one ortho-halo group on each of the two reacting partners which increases Z-selectivit