Un Unexpected Tricarbonyl(fulvene)chromium Complex from a Pentacarbonyl[(Z) -2-dimethylaminoethenyl]carbenechromium Complex and 1-Pentyne
- 1 January 1993
- journal article
- letter
- Published by Georg Thieme Verlag KG in Synlett
- Vol. 1993 (07) , 486-488
- https://doi.org/10.1055/s-1993-22500
Abstract
Michael addition of dimethylamine to pentacarbonyl[1-ethoxy-4-methyl-4 -trimethylsilyloxypentynylidene]chromium 1 gives pentacarbonyl[(2Z)-3-dimethylamino-1-ethoxy-4-methyl-4- trimethylsilyloxypentenylidene]chromium 2 in high yield. Complex 2 reacts with 1-pentyne to give tricarbonyl (6,6-dimethyl-1-dimethylamino-1-ethoxy-2-propylfulvene)chromium 6 as the main product. In the presence of base or fluoride, complex 2 cyclizes after desilylation to pentacarbonyl(4-dimethylamino-3,3-dimethyl-2-oxacyclopentenylidene)chromium complex 7 in excellent yield.Keywords
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