OLEFIN SYNTHESIS VIA THE LITHIUM DERIVATIVES OF THE N, N, N, N′-TETRAMETHYLDIAMIDES OF ARYLMETHANEPHOSPHONIC ACIDS. 2. SYNTHESIS …

J Petrova, S Momchilova, M Kirilov

Index: Petrova, Jordanka; Momchilova, Snejana; Kirilov, Marko Phosphorus and Sulfur and the Related Elements, 1985 , vol. 24, p. 243 - 250

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Citation Number: 7

Abstract

Abstract The reaction of the lithium derivatives of N, N, N′, N′-tetramethyldiamides of arylmethanephosphonic acids (1-Li) with ortho-and para-substituted benzaldehydes 2 is studied. Reaction conditions are found for erythro-stereoselective addition of 1 to 2 with high diastereomeric purity (95–99%) of the erythro adducts 3, 4 (yields 35–72%). By thermolysis of the adducts in neutral medium the corresponding (Z)-ortho and para-substituted ...