Pyridylseleno group in organic synthesis. Preparation and oxidation of .alpha.-(2-pyridylseleno) carbonyl compounds leading to .alpha.,.beta.-unsaturated ketones and aldehydes
Pyridylseleno group in organic synthesis. Preparation and oxidation of .alpha.-(2-pyridylseleno) carbonyl compounds leading to .alpha.,.beta.-unsaturated ketones and aldehydes