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Methylenation of carbonyl compounds with ZnCH2Br2TiCl4. Application to gibberellins

✍ Scribed by Luciano Lombardo

Book ID
104221996
Publisher
Elsevier Science
Year
1982
Tongue
French
Weight
205 KB
Volume
23
Category
Article
ISSN
0040-4039

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✦ Synopsis

A highly active species prepared from Zn-CH2Br2-Tic14 reacted instantaneously with aldehydes and ketones to give methylenated products with exceptional selectivity. Methylenation of carbonyl derivatives to give olefins, i.e. R2C=O + R2C=CH2, by means of the Wittiq reaction' is one of the most useful of synthetic processes.

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## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

Formation of .eta.1-iminoacyl compounds
Formation of .eta.1-iminoacyl compounds by insertion of isonitriles into pentamethylcyclopentadienyl-tetramethylfulvene compounds of titanium and zirconium. Intramolecular C-H activation of a pentamethylcyclopentadienyl group to give a tridentate ligand with two bridged cyclopentadienyl rings and a titanium-vinyl bond in the bridge. Molecular structure of [cyclic][.eta.5:.eta.1:.eta.5-C5Me4CH2C(NHXyl):CN(Xyl)CH2C5Me4]TiCl and [cyclic]Cp*[.eta.5:.eta.1-C5Me4CH2C(:NXyl)C(:NXyl)]ZrCl (Xyl=2,6-Me2C6H3)
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