Details

Autor(en) / Beteiligte

• Mullins, Jeremy C.
• Yuvaraj, K.
• Sowden, Madison J.
• Sherburn, Michael S.
• Jones, Cameron

Titel

Reductive Metallation of Dendralenes and Myrcene Using Dimagnesium(I) Compounds: A Facile Route to Unsaturated Organomagnesium Compounds

Ist Teil von

• Chemistry : a European journal, 2024-01, Vol.30 (6), p.e202303219-n/a

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2024

Quelle

Wiley Online Library

Beschreibungen/Notizen

• The two‐electron reduction of 2,3‐dimethylbuta‐1,3‐diene (DMB) with β‐diketiminate and guanidinate substituted dimagnesium(I) compounds has given complexes in which two bidentate amido‐magnesium fragments are bridged through the π‐system of the DMB dianion, viz. [(LMg)2(μ‐DMB)] (L=XylNacnac, [HC(MeCNXyl)2]−, Xyl=2,6‐xylyl; or Priso=[(DipN)2CNPri2]−, Dip=2,6‐diisopropylphenyl). Similar double reductions of [4]dendralene (4dend) have afforded the complexes, [(LMg)2(μ‐4dend)] (L=ArNacnac, Ar=Xyl or mesityl (Mes); or Priso) in which the 4dend dianion is π‐coordinated to the bidentate amido‐magnesium fragments. Treatment of several such complexes with THF leads to Z‐ to E‐isomerization of the dendralene fragment, and formation of purely σ‐bonded Mg−C interactions in the THF coordinated products [{(ArNacnac)(THF)Mg}2(μ‐4dend)] (Ar=Xyl, Mes or Dip). Reaction of myrcene (Myr) with [{(XylNacnac)Mg}2] proceeds via reductive coupling of Myr to give a previously unknown acyclic, branched C20 tetra‐olefin dianion complex [{(XylNacnac)(THF)Mg}2(μ‐Myr)2]. Preliminary reactions of [(LMg)2(μ‐DMB)] with H2 and/or CO yielded a series of products, including novel magnesium hydride compounds, products derived from couplings of CO with the reduced DMB fragment (viz. magnesium dimethylcyclohexadienediolates), and one magnesium cyclopropanetriolate complex from the magnesium(I) induced coupling of DMB with H2 and CO. Reducing dendralenes: The reduction of [4]dendralene and related substituted butadienes with dimagnesium(I) compounds has given a series of unsaturated organo‐magnesium complexes (see picture, L=bulky N,N‐chelating amide). Reaction of two of these with H2 and/or CO leads to the assembly of the substrates, affording value‐added organic products.