serpentine Chemische Eigenschaften,Einsatz,Produktion Methoden
Beschreibung
This alkaloid has been isolated from Rauwolfia serpentina Benth and forms yellow plates from MeOH or EtOH. The earlier formula of C
20H
200
3N
2 has recently been altered to that given above. The hydrochloride hydrate has m.p. l33-5°C or 248-260°C (dry);[α]
40D + 188° (H
20); nitrate, m.p. 172°C; nitrite, m.p. l65-6°C (dec.); perchlorate, m.p. 256°C; picrate, m.p. 26l-2°C and methiodide, 245-6°C. The base also yields a monobromo-hydrobromide, m.p. 257-8°C (dec.). On heating to 210°C it isomerizes to isoserpentine, colourless prismatic rods, m.p. 230-2°C yielding a hydrochloride, m.p. 271-2°C; [α]
34D+ 168.08° (H
20) and the picrate, m.p. 263-4°C.
Definition
serpentine: Any of a group of hydrousmagnesium silicate mineralswith the general compositionMg
3Si
2O
5(OH)
4. Serpentine is monoclinicand occurs in two main forms:chrysotile, which is fibrous and thechief source of asbestos; and antigorite,which occurs as platy masses. Itis generally green or white with amottled appearance, sometimes resemblinga snakeskin – hence thename. It is formed through the metamorphicalteration of ultrabasicrocks rich in olivine, pyroxene, andamphibole. Serpentinite is a rockconsisting mainly of serpentine; it isused as an ornamental stone.
Landwirtschaftliche Anwendung
Serpentine is a mineral consisting of magnesium silicate.
With a green and white color and a mottled appearance,
this mineral looks like a snake's skin.
Serpentine has a general composition of
Mg
3Si
2O
5(OH)
4.
Einzelnachweise
Siddiqui, Siddiqui., J. Ind. Chem. Soc., 8,667 (1931)
Siddiqui, Siddiqui., ibid, 9, 539 (1932)
Siddiqui, Siddiqui., ibid, 12, 37 (1935)
serpentine Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte