4-TERT-BUTYLCALIX[8]ARENE manufacturers and suppliers

4-TERT-BUTYLCALIX[8]ARENE suppliers

Properties

Melting point:: 411-412 °C(lit.)

Boiling point:: 845.32°C (rough estimate)

Density: 1.095±0.06 g/cm3 (20 ºC 760 Torr)

refractive index: 1.6000 (estimate)

pka: 9.23±0.20(Predicted)

form: Micro-Crystalline Powder

color: White to off-white

BRN: 2612052

Safety Information

Symbol(GHS): GHS07

Signal word: Warning

Hazard statements: H315-H319-H335

Precautionary statements: P264-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313-P261-P280a-P304+P340-P305+P351+P338-P405-P501a

Hazard Codes: Xi

Risk Statements: 36/37/38

Safety Statements: 26-36

WGK Germany: 3

TSCA: Yes

HS Code: 29072990

Use

The calixarene recrystallises from CHCl3 in fine colourless, glistening needles. It melts sharply between 400-401o and 411-412o depending on the sample and is sensitive to traces of metal ions. On TLC with silica gel (250\m thick) and elution with CHCl3/hexane (3:4) it has RF 0.75. The octa-acetate is prepared from 8g in Ac2O (50mL) and 2 drops of conc H2SO4 and refluxed for 2hours. On cooling, a colourless precipitate separates and is recrystallised from Ac2O (1.2g 48%) with m 353-354o. The (SiMe3)8 is prepared from 4-tert-butylcalix[8]arene (0.65g) in pyridine (4mL) with excess of hexamethyldisilazane (1mL) and trimethylchlorosilane (0.5mL) and refluxed under N2 for 2hours. Cool, evaporate the pyridine, triturate the gummy residue with MeOH. Chromatograph on silica gel using hexane/CH2Cl2 gave 0.5g (61%) with one spot on TLC. Recrystallise it from hexane/Me2CO to give colourless needles m 358-360o. [Gutsche et al. J Am Chem Soc 103 3782 1981, Gutsche see Kluawer in Calixarenes, Vicens & B.hner eds Academic Press 1991.]

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