4-メチルベンゾフェノン 化学特性,用途語,生産方法
外観
白色～わずかにうすい褐色, 結晶～結晶性粉末又は塊
溶解性
エタノールに溶けやすく、水にほとんど溶けない。
用途
有機合成原料。
化学的特性
white to beige crystalline powder or crystals
使用
4-Methylbenzophenone is used as clear coatings for wood, plastic and metal, overprint varnish.
一般的な説明
4-Methylbenzophenone is a photo-initiator for printing inks, mainly applied to the cardboard boxes used for packing. It is reported to be a non-genotoxic carcinogen. However, it can contaminate foodstuffs when it comes in contact with the package contents.
安全性プロファイル
Poison by
intraperitoneal route. A flammable liquid.
When heated to decomposition it emits
acrid smoke and irritating fumes.
純化方法
Crystallise the ketone from MeOH, Et2O (m 58-59o) or pet ether. The cis-oxime has m 154o(153-156o) (from EtOH), and the trans-oxime has m 114-116o (from pet ether). [Beilstein 7 H 440, 7 III 2127, 7 IV 1403.]
Structure and conformation
4-Methylbenzophenone was one of the first organic compounds for which polymorphism was observed. It crystallizes in two modifications, the stable monoclinic α-form (mp 59°C) and a metastable trigonal β-form (mp 55 ℃). The metastable β-form is rather stable and almost indefinitely preserved if not subjected to severe mechanical load or brought into contact with the stable form. If it converts into a stable form, the crystal becomes milky white and non-transparent due to micro-cracking. There are no conditions under which the β-form is more stable than the α-form. 4-Methylbenzophenone crystallizes in a monoclinic stable form (mp 59 ℃) with a = 5.70 Å, b = 13.89 Å, c = 14.08 Å, p = 95.18° and space group P2
1/c, and a trigonal metastable form (mp 55°C) with a = 9.12 Å, c = 11.28 Å and space groups P3
1, or P3
2[1].
4-メチルベンゾフェノン 上流と下流の製品情報
原材料
準備製品