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Published TCIMAIL newest issue No.198
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CAS RN: 933-52-8 | Product Number: D0258
Tetramethyl-1,3-cyclobutanedione [Precursor to Dimethyl Ketene]
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![Tetramethyl-1,3-cyclobutanedione [Precursor to Dimethyl Ketene]](/_ui/responsive/theme-tci/images/missing_product_zoom.jpg "Tetramethyl-1,3-cyclobutanedione [Precursor to Dimethyl Ketene]")
Purity: >99.0%(GC)
Synonyms:
- Dimethyl Ketene Dimer
Product Documents:
| Size | Unit Price | Belgium | Japan* | Quantity |
|---|---|---|---|---|
| 5G |
€28.00
|
4 | 15 |
|
| 25G |
€106.00
|
2 | 25 |
|
*Stock available in Belgium will be delivered in 1 to 3 days
*Stock available in Japan will be delivered in 1 to 2 weeks (excludes regulated items and dry ice shipments).
| Product Number | D0258 |
| Purity / Analysis Method | >99.0%(GC) |
| Molecular Formula / Molecular Weight | C__8H__1__2O__2 = 140.18 |
| Physical State (20 deg.C) | Solid |
| Storage Temperature | Room Temperature (Recommended in a cool and dark place, <15°C) |
| CAS RN | 933-52-8 |
| Reaxys Registry Number | 1072094 |
| PubChem Substance ID | 87566962 |
| SDBS (AIST Spectral DB) | 738 |
| MDL Number | MFCD00001331 |
Specifications
| Appearance | White to Almost white powder to crystal |
| Purity(GC) | min. 99.0 % |
| Melting point | 112.0 to 115.0 °C |
Properties (reference)
| Melting Point | 114 °C |
| Boiling Point | 159 °C |
GHS
Related Laws:
| EC Number | 213-269-6 |
| RTECS# | GU1775000 |
Transport Information:
| HS Number | 2914290090 |
Application
Preparation of Dimethyl Ketene
Typical Procedure: Tetramethyl-1,3-cyclobutanedione is placed in the ketene generation apparatus, heated at 120 ℃, and sublimed, then thermally decomposed by means of the red heated Nichrome wire under the nitrogen atmosphere. Subsequently, the evolved gas is captured by means of a trap cooled in dry ice-acetone to obtain dimethylketene in about 60% yield. Dimethylketene is a yellowish liquid (bp 34 ℃) with characteristic odor, remarkable reactivity, and transforms into a solid dimer when allowed to stand at room temperature. On exposure to air it generates white solid peroxides and explodes with even the slightest stimulus. For this reason, its monomer is stored under nitrogen at -78 ℃ and it is used immediately.
References
- Kogyo Kagaku Zasshi 1963, 66, 467.
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