Evaluation of titanium alkoxides and aryloxides in the Kulinkovich cyclopropanation of carboxylic esters
β Scribed by Jae Chol Lee; Moo Je Sung; Jin Kun Cha
- Book ID
- 104230220
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- French
- Weight
- 65 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
Systematic evaluation of several titanium alkoxides and aryloxides was undertaken in the titanium-mediated cyclopropanation reactions of carboxylic esters. Chlorotitanium triisopropoxide and/or methyltitanium triisopropoxide were found to be the reagents of choice for the olefin exchange modification, whereas the original Kulinkovich process proved to be insensitive to the nature of titanium alkoxides and aryloxides.
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## Abstract For Abstract see ChemInform Abstract in Full Text.
## Abstract The reaction of carboxylic esters with ethylmagnesium bromide in the presence of titanium(IV) isopropoxide, which leads to the formation of substituted cyclopropanols, was disclosed in the late 1980β²s. The key organometallic intermediates in this transformation are diisopropoxytitanacyc
## Abstract A procedure for the preparation of __cis__β1,2βdialkylcyclopropanols by titanium(IV) alkoxideβmediated cyclopropanation of carboxylic esters with Grignard reagents, involving the addition of 1.5 equiv. of a higher homologue of ethylmagnesium halide to a mixture of 1 equiv. of carboxylic