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The application of high pressure to some difficult Wittig reactions

✍ Scribed by Neil S. Isaacs; Ghazi Najim El-Din

Publisher
Elsevier Science
Year
1987
Tongue
French
Weight
100 KB
Volume
28
Category
Article
ISSN
0040-4039

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✦ Synopsis

Wittig reactions, previously shm to be favourably accelerated under pressure have been carried out between the stabilised ylides carboethoxymethylenetriphenylphosphorane and carboethoxyethylidinetriphenylphosphorane with a variety of ketones at 9-10 kbar pressure. Successful formation of tri-and tetra-substituted ethylenes is reported.

We have previously measured vp1me.s of activation of iJittig reactions and

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New applications of the wittig reaction
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✍ William G. Dauben; Jeffrey D. Robbins πŸ“‚ Article πŸ“… 1975 πŸ› Elsevier Science 🌐 French βš– 204 KB

In the past few years there has been a rapid growth of interest in the n preparation of strained bridgehead olefins'. Until recently the reported synthetic approaches all involved a separate construction of the ring system prior to introduction of the double bond. In 1973, however, a facile synthesi