Tetraethoxymethane

Tetraethoxymethane
Names
	Other names Tetraethyl orthocarbonate
Identifiers
CAS Number	78-09-1;
3D model (JSmol)	Interactive image;
ChemSpider	59598;
ECHA InfoCard	100.000.985
EC Number	201-082-2;
PubChem CID	66213;
UNII	W2P2570012;
CompTox Dashboard (EPA)	DTXSID1075278;
	InChI InChI=1S/C9H20O4/c1-5-10-9(11-6-2,12-7-3)13-8-4/h5-8H2,1-4H3 Key: CWLNAJYDRSIKJS-UHFFFAOYSA-N;
	SMILES CCOC(OCC)(OCC)OCC;
Properties
Chemical formula	C9H20O4
Molar mass	192.25 g·mol−1
Appearance	liquid
Density	0.919
Boiling point	159.5 °C (319.1 °F; 432.6 K)
Hazards
GHS pictograms
GHS hazard statements	H226, H315, H319, H335
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Tetraethoxymethane is a chemical compound which is formally formed by complete ethylation of the hypothetical orthocarbonic acid C(OH)₄ (orthocarboxylic acid violates the Erlenmeyer rule and is unstable in free state).

History

Tetraethoxymethane was described the first time in 1864.[1]

Synthesis

The preparation of tetraethoxymethane from the highly toxic trichloronitromethane is known in the literature[1][2][3][4] and achieves only yields of 46-49[3] to 58%:[4]

The obvious synthetic route from tetrachloromethane does not provide the desired product, as in the homologous tetramethoxymethane.[5]

Starting from the less toxic trichloroacetonitrile (compared with trichloronitromethane), higher yields can be obtained (up to 85%).[6] An alternative reaction, bypassing problematic reactants, is the reaction of dialkyltin dialkoxides with carbon disulfide at elevated temperature in an autoclave:[7]

A more recent synthesis starts directly from sodium ethoxide, tin(IV)chloride, and carbon disulfide.[8]

Properties

Tetraethoxymethane is water-clear, aromatic or fruity smelling,[9] liquid of low-viscosity which is unstable against strong acids and strong bases.[10]

Uses

Tetraethoxymethane can be used as a solvent and for the alkylation of CH-acidic compounds (e.g. phenols and carboxylic acids). In addition, it reacts with amines, enol ethers and sulfonamides,[11] whereby spiro compounds can also be obtained. Spiro orthocarbonates (SOCs)[12] are of some industrial interest, as they are used as additives for reducing shrinkage during the polymerization of epoxides (they are used as expanding monomers).[13]

References

H. Bassett, Ueber das vierfach-basische kohlensaure Aethyl, Ann. 132, 54 (1864), doi:10.1002/jlac.18641320106.
H. Tieckelmann, H.W. Post, The preparation of methyl, ethyl, propyl, and butyl orthocarbonates, J. Org. Chem., 13 (2), 265–267 (1948), doi:10.1021/jo01160a014.
"Ethyl Orthocarbonate". Organic Syntheses. doi:10.15227/orgsyn.032.0068.
Europäische Patentschrift EP 0881212 B1, Production method of aminobenzene compound, Erfinder: H. Hashimoto et al., Anmelder: Takeda Chemical Industries, Ltd., veröffentlicht am 30. Oktober 2001.
R.H. De Wolfe, Carboxylic ortho acid derivatives: preparation and synthetic applications, Organic Chemistry, Vol. 14, Academic Press, Inc. New York – London, 1970, ISBN 978-0-12-214550-6.
US-Patent US 6825385, Process for the preparation of orthocarbonates, Erfinder: G. Fries, J. Kirchhoff, Anmelder: Degussa AG, erteilt am 30. November 2004.
S. Sakai et al., Reaction of Dialkyltin Dialkoxides with Carbon Disulfide at Higher Temperature. Preparation of Orthocarbonates, J. Org. Chem., 36 (9), 1176 (1971), doi:10.1021/jo00808a002.
S. Sakai et al., A new method for preparation of tetraalkyl orthocarbonates from sodium alkoxides, tetrachlorostannane, and carbon disulfide, Synthesis 1984 (3), 233–234, doi:10.1055/s-1984-30785.
J. H. Ruth, Odor Thresholds and Irritation Levels of Several Chemical Substances: A Review, Am. Ind. Hyg. Assoc. J. 47, A-142 – A-151, (1986).
Sigma-Aldrich Co., product no. {{{id}}}.
W. Kantlehner et al., Die präparative Chemie der O- und N-funktionellen Orthokohlensäure-Derivate, Synthesis, 1977, 73–90.
D.T. Vodak et al., One-Step Synthesis and Structure of an Oligo(spiro-orthocarbonate), J. Am. Chem., Soc., 124, 4942–4943 (2002), doi:10.1021/ja17683i.
R. Acosta Ortiz et al., Novel diol spiro orthocarbonates derived from glycerol as anti-shrinkage additives for the cationic photopolymerization of epoxy monomers, Polymer International, 59(5), 680–685 (2010), doi:10.1002/pi.2755.

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[Bassett-1] H. Bassett, Ueber das vierfach-basische kohlensaure Aethyl, Ann. 132, 54 (1864), doi:10.1002/jlac.18641320106.

[2] H. Tieckelmann, H.W. Post, The preparation of methyl, ethyl, propyl, and butyl orthocarbonates, J. Org. Chem., 13 (2), 265–267 (1948), doi:10.1021/jo01160a014.

[Organic_Syntheses-3] "Ethyl Orthocarbonate". Organic Syntheses. doi:10.15227/orgsyn.032.0068.

[Hashimoto-4] Europäische Patentschrift EP 0881212 B1, Production method of aminobenzene compound, Erfinder: H. Hashimoto et al., Anmelder: Takeda Chemical Industries, Ltd., veröffentlicht am 30. Oktober 2001.

[De_Wolfe-5] R.H. De Wolfe, Carboxylic ortho acid derivatives: preparation and synthetic applications, Organic Chemistry, Vol. 14, Academic Press, Inc. New York – London, 1970, ISBN 978-0-12-214550-6.

[6] US-Patent US 6825385, Process for the preparation of orthocarbonates, Erfinder: G. Fries, J. Kirchhoff, Anmelder: Degussa AG, erteilt am 30. November 2004.

[7] S. Sakai et al., Reaction of Dialkyltin Dialkoxides with Carbon Disulfide at Higher Temperature. Preparation of Orthocarbonates, J. Org. Chem., 36 (9), 1176 (1971), doi:10.1021/jo00808a002.

[8] S. Sakai et al., A new method for preparation of tetraalkyl orthocarbonates from sodium alkoxides, tetrachlorostannane, and carbon disulfide, Synthesis 1984 (3), 233–234, doi:10.1055/s-1984-30785.

[9] J. H. Ruth, Odor Thresholds and Irritation Levels of Several Chemical Substances: A Review, Am. Ind. Hyg. Assoc. J. 47, A-142 – A-151, (1986).

[10] Sigma-Aldrich Co., product no. {{{id}}}.

[11] W. Kantlehner et al., Die präparative Chemie der O- und N-funktionellen Orthokohlensäure-Derivate, Synthesis, 1977, 73–90.

[12] D.T. Vodak et al., One-Step Synthesis and Structure of an Oligo(spiro-orthocarbonate), J. Am. Chem., Soc., 124, 4942–4943 (2002), doi:10.1021/ja17683i.

[13] R. Acosta Ortiz et al., Novel diol spiro orthocarbonates derived from glycerol as anti-shrinkage additives for the cationic photopolymerization of epoxy monomers, Polymer International, 59(5), 680–685 (2010), doi:10.1002/pi.2755.