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[(CH3 )Al(CH2 )]12 : Methylaluminomethylene (MAM-12).

Georgios Spiridopoulos1, Markus Kramer2, Felix Kracht1

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Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 31, 2022
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Summary

The molecular structure of poly(aluminium-methyl-methylene) was elucidated using a transmetalation reaction. This breakthrough enabled the development of a novel methylene transfer reagent for ketones.

Keywords:
aluminiumlutetiummethylmethylenetitanium

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Area of Science:

  • Organometallic Chemistry
  • Materials Science
  • Inorganic Chemistry

Background:

  • The enigmatic "poly(aluminium-methyl-methylene)" structure, first reported in 1968, has remained largely uncharacterized.
  • Previous attempts to synthesize well-defined structures yielded amorphous materials or low-yield clusters.

Purpose of the Study:

  • To unravel the molecular structure of poly(aluminium-methyl-methylene).
  • To develop a stable and efficient methylene transfer reagent derived from this structure.

Main Methods:

  • Transmetalation reaction using gallium methylene [Ga8 (CH2 )12 ] and trimethylaluminium (AlMe3).
  • Synthesis and characterization of the crystalline dodeca-aluminium complex [(CH3 )12 Al12 (μ3 -CH2 )12 ] (MAM-12).
  • Revisiting prior synthetic approaches using titanium-based catalysts.

Main Results:

  • The crystalline dodeca-aluminium complex (MAM-12) was reproducibly synthesized via transmetalation.
  • Amorphous solids with MAM-12-like properties were obtained using a titanium-based method.
  • The synthesized MAM-12 demonstrated efficacy as a methylene transfer reagent for ketones.

Conclusions:

  • The molecular structure of poly(aluminium-methyl-methylene) has been successfully elucidated as the dodeca-aluminium complex MAM-12.
  • MAM-12 serves as a valuable and efficient methylene transfer reagent in organic synthesis.
  • This work provides a pathway to well-defined aluminium-methyl-methylene compounds.