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Tetrakis(dimethylamino)ethylene

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Tetrakis(dimethylamino)ethylene
Names
Preferred IUPAC name
N1,N1,N′1,N′1,N2,N2,N′2,N′2-Octamethylethene-1,1,2,2-tetramine
Other names
Octamethyl-ethenetetramine
TDAE
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.012.398 Edit this at Wikidata
EC Number
  • 213-638-1
UNII
  • InChI=1S/C10H24N4/c1-11(2)9(12(3)4)10(13(5)6)14(7)8/h1-8H3
    Key: CBXRMKZFYQISIV-UHFFFAOYSA-N
  • CN(C)C(=C(N(C)C)N(C)C)N(C)C
Properties
C10H24N4
Molar mass 200.330 g·mol−1
Appearance colorless liquid
Density 0.861 g/cm3 (25 °C)
Melting point −4 °C (25 °F; 269 K)
Boiling point 59 °C (0.9 mm Hg)
Hazards
GHS labelling:
GHS02: FlammableGHS05: Corrosive
Danger
H226, H314
P210, P233, P240, P241, P242, P243, P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P370+P378, P403+P235, P405, P501
Flash point 53 °C (127 °F; 326 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tetrakis(dimethylamino)ethylene (TDAE) is an organic compound with the formula [C(NMe2)2]2 (where Me = CH3), classified as an enamine. It is a colorless liquid. Primary and secondary enamines tend to isomerize, but tertiary enamines are kinetically stable.[1] The unusual feature of TDAE is that it is a tetra-enamine. The pi-donating tendency of the amine groups strongly modifies the properties of the molecule, which does exhibit properties of a typical alkene.[2]

Reactions

TDAE reacts with oxygen in a chemiluminescent reaction to give tetramethylurea[3][4]

Oxidation of TDAE (chemiluminescence).
Oxidation of TDAE (chemiluminescence).

TDAE is an electron donor with E = 1.06 V vs Fc+/0.[5][6] It forms a charge transfer salt with buckminsterfullerene:[7]

C2(N(CH3)2)4 + C60 → [C2(N(CH3)2)4+][C60−]

Oxidation affords a dication.

Structure

Crystallographic analysis show that TDAE is a highly distorted alkene, the dihedral angle for the two N2C termini is 28°. The C=C distance is alkene-like, 135 pm. The nearly isostructural tetraisopropylethylene also has a C=C distance of 135 pm, but its C6 core is planar. In contrast, [TDAE]2+ is an alkane with multi-C-N bonds.[8]

Structure of TDAE and its dication (distances in picometers).[8]

Synthesis

The reaction of chlorotrifluoroethene and dimethylamine produces TDAE:[9]

References

  1. ^ Spitz, Cédric; Terme, Thierry; Vanelle, Patrice (2023). "1,1,2,2-Tetrakis(dimethylamino)ethene". Encyclopedia of Reagents for Organic Synthesis (EROS). doi:10.1002/047084289X. hdl:10261/236866. ISBN 978-0-471-93623-7.
  2. ^ David M. Lemal (1968). "Tetraaminoethylenes". In Saul Patai (ed.). The Amino Group. PATai's Chemistry of Functional Groups. pp. 701–748. doi:10.1002/9780470771082. ISBN 9780470771082.
  3. ^ H.E. Winberg; J. R. Downing; D. D. Coffman (1965). "The Chemiluminescence of Tetrakis(dimethylamino)ethylene". J. Am. Chem. Soc. 87 (9): 2054–2055. doi:10.1021/ja01087a039.
  4. ^ "Chemilumineszenz von TDAE" (in German). illumina-chemie.de. 2014-08-08. Retrieved 2016-08-22.
  5. ^ Broggi, Julie; Terme, Thierry; Vanelle, Patrice (2014-01-07). "Organic Electron Donors as Powerful Single-Electron Reducing Agents in Organic Synthesis" (PDF). Angewandte Chemie International Edition. 53 (2): 384–413. doi:10.1002/anie.201209060. PMID 24273111.
  6. ^ Kuroboshi, Manabu; Waki, Yoko; Tanaka, Hideo (2003). "Palladium-Catalyzed Tetrakis(dimethylamino)ethylene-Promoted Reductive Coupling of Aryl Halides". The Journal of Organic Chemistry. 68 (10): 3938–3942. doi:10.1021/jo0207473. PMID 12737575.
  7. ^ Allemand PM, Khemani KC, Koch A, et al. (1991). "Organic Molecular Soft Ferromagnetism in a Fullerene". Science. 253 (5017): 301–302. Bibcode:1991Sci...253..301A. doi:10.1126/science.253.5017.301. PMID 17794696. S2CID 19561675.
  8. ^ a b Bock, Hans; Borrmann, Horst; Havlas, Zdenek; et al. (1991). "Tetrakis(dimethylamino)ethene: An Extremely Electron-Rich Molecule with Unusual Structure both in the Crystal and in the Gas Phase". Angewandte Chemie International Edition in English. 30 (12): 1678–1681. doi:10.1002/anie.199116781.
  9. ^ US 3293299, H. Boden, "Process for making tetrakis(dimethylamino)ethylene", published 1966-12-20, assigned to E.I. du Pont de Nemours and Co. 
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