The dimesitylboron group in organic synthesis 1. Introduction.
β Scribed by Andrew Pelter; Bakthan Singaram; Lorraine Williams; John W. Wilson
- Book ID
- 104216976
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- French
- Weight
- 260 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
The bulky dimesitylboron group encourages the formation of an o-carbanion from dimesitylalkylboranes by proton abstraction by a relatively hindered base, as compared with ate complex formation. It also stabilises the carbanion so formed. However the dimesitylboron group allows ate complex formation with unhindered bases, so allowing oxidative release of organic moieties from alkyldimesitylboranes. This desirable combination of properties has great potential for organic synthetic methodology.
π SIMILAR VOLUMES
Anions generated c1-to a dimesitylboron group readily condense with aldehydes and ketones. reaction.
The synthesis of the title compounds where the heteroatoms are silicon, tin, lead and sulphur and mercury is demonstrated. Some of these derivatives readily form anions of structural and chemical interest. We have shown that carbanions stabilised by an c1 boron atom can be readily synthesised and a
Alkyldimesitylboranes, yield anions', by oxidation give 1,3-diols. ## These anions Mes2BCHR. that on reaction with oxiranes followed are thus the operational equivalent of RCHOH. The scope and limitations of the new process are delineated.
Dimesitylborane, 1, is a readily available, solid, stable borane that is the most selective known reagen? for the regioselective hydroboration of unsymmetrical alkynes. In addition all-alkynes are selectively hydroborated compared with even terminal alkenes. The hydroborazn of alkenes with 1 is slow