Benzotriazole-mediated stereoselective olefination of carboxylic esters: Transformation of ...-...

Describes a method which connects carboxylic esters with benzyl or allylic groups to form carbon-carbon double bonds, with good selectivity for trans-isomers. Importance of constructive olefination of carbonyl compounds in organic synthesis; Information on the unsymmetric intermolecular coupling between carbonyl compounds and dithioacetals with low-valent titanium.