Tetrahedron Letters p. 1575 - 1578 (1981)
Update date:2022-08-04
Topics:
Larson, Gerald L.
Prieto, J. Antonio
Hernandez, Antonio
The reaction of 2-t-butyldimethylsilyloxy cycloalkanones (5,6 and 7 membered rings) with carboethoxymethylenetriphenylphosphorane gives almost exclusively the E isomeric Wittig products, whereas reaction with ethyl lithiotrimethylsilylacetate gives predominantly the Z isomers.The Z products show the methine proton at ca. 5.5 ppm, an unusual large chemical shift for this type of proton.
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Doi:10.1016/S0040-4039(02)02613-8
(2003)Doi:10.1070/MC2001v011n03ABEH001429
(2001)Doi:10.1016/S0040-4039(01)92935-1
(1981)Doi:10.1021/jo00335a068
(1981)Doi:10.1007/BF00901831
(1981)Doi:10.1021/jo00335a070
(1981)
