Grignard reagents conjugated dienes

The organoborate intermediates can also be generated from alkenylboronic esters and alkyllithium or Grignard reagents, or from ttialkylboranes and alkenyllithium compounds. Conjugated symmetrical and unsymmetrical diynes (289—291), stereochemically pure 1,3-dienes (292,293), and 1,3-enynes (294) including functionali2ed systems can be prepared (289,295). 

Catenated Organic Compounds of the Group IV Elements, 4,1 Conjugate Addition of Grignard Reagents to Aromatic Systems, 1, 221 Cyclobutadiene Metal Complexes, 4, 95 Cyclopentadienyl Metal Compounds, 2, 365 Diene-Iron Carbonyl Complexes, 1, 1... 

Scheme 15 Reaction of conjugated dienes with alkyl Grignard reagents and CI2TiCp2.

Acetoacetic Ester Synthesis Section 20.4 Addition of an Alcohol to an Aldehyde or a Ketone Section 18.9 Figure 18.5 Addition of a Carbene to an Alkene Section 11.8 Addition to a Conjugated Diene Section 11.13 Addition of a Grignard Reagent to an Aldehyde or a Ketone Section 18.6... 

To date, several jt-allylmthenium complexes have been prepared and reported. The representative methods for introducing an allyl group to a ruthenium complex are quite similar to those for other transition metals for example, (1) the reaction of ruthenium halides with allyl Grignard reagents (2) the insertion of conjugated dienes into a hydrido-ruthenium bond and (3) the oxidative addition of several allylic compounds to low-valence ruthenium complexes. 

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