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The published data on the methods for alkene synthesis The published data on the methods for alkene synthesis by olefination of carbonyl compounds are generalised and sys-by olefination of carbonyl compounds are generalised and systematised. The main attention is given to the use of transition tematised. The main attention is given to the use of transition metals and organoelement compounds. The review covers the metals and organoelement compounds. The review covers the data on both classical and newly developed methods that are little data on both classical and newly developed methods that are little known to chemists at large. The bibliography includes 276 known to chemists at large. The bibliography includes 276 references references. .