Di-tert-butyl-p-cresol

Crotonaldehyde (2-butenal) [123-73-9] M 70.1, b 104-105 , d 0.851, n 1.437. Fractionally distd under N2, through a short Vigreux column. Stored in sealed ampoules. Stabilised with 0.01% of 2,6-di-tert-butyl-p-cresol... 

Di-tert-butyl-p-cresol (2,6-di-tert-butyl-4-methylphenol, butylatedhydroxytoluene, BHT) [128-37-0] M 230.4, m 71.5 , pK 12.23. Dissolved in n-hexane at room temperature, then cooled with rapid stirring, to -60°. The ppte was separated, redissolved in hexane, and the process was repeated until the mother liquor was no longer coloured. The final product was stored under N2 at 0° [Blanchard J Am Chem Soc 82 2014 7960]. Also crystd from EtOH, MeOH, benzene, n-hexane, methylcyclohexane or pet ether (b 60-80°), and dried under vacuum. 

Fractionally distilled and 0.5% of 2,6-di-tert-butyl-p-cresol added to stabilise it. [Doklady Acad Nauk USSR 93 293 7955 Chem Abs 48 13616 7954.]... 

Tetrahydrofuran has been reported to exhibit an absorption maximum at 280 nm (52,56), but several workers have shown that this band is not produced by the purified solvent (30,41,57). Oxidation products from THF have been invoked in order to account for the appearance of the 280-nm band in PVC films that are solvent-cast from THF in air (57. 581. However, in some reported cases (56,59), this band was undoubtedly produced, at least in part, by a phenolic antioxidant (2.6-di-tert-butyl-p-cresol)(59) in the solvent. Since certain -alkylphenols have now been shown to be powerful photosensitizers for the dehydrochlorination of PVC (60), it is clear that antioxidant photosensitization might well have been responsible for some of the effects attributed previously (56) to THF alone. On the other hand, enhanced rates of photodegradation under air have also been observed for PVC films cast from purified THF (57), a result which has been ascribed to radical formation during the photooxidation of residual solvent (57,61). Rabek et al. (61) have shown that this photooxidation produces a-HOO-THF, a-HO-THF, and y-butyro-lactone, and they have found that the hydroperoxide product is an effective sensitizer for the photodehydrochlorination of PVC at X = 254 nm (61). 

Di-tert-butyl-p-cresol, 3 105 2,4-Di-tert-butylphenol (2,4-DTBP),... 

It should be mentioned that the commercially available VC usually contained a small percentage (<2%) of prohibitors that stabilized the reactive VC from polymerizing upon storage. These compounds were usually radical scavengers such as 2,6-di-tert-butyl-p-cresol (DBC) or butylated hydroxy toluene (BHT). Recently, reports pointed out that the presence of these prohibitors actually had a negative impact on the anodic stability of VC on various cathode materials, and VC of high purity was of vital importance in obtaining reproducible performance in lithium ion cells. 

Toxicology. 2,6-Di-tert-butyl-p-cresol or BHT is of relatively low acute toxicity in animals, and there is no evidence of either acute or chronic effects among exposed workers. 

The 2003 ACGIH threshold limit value-time-weighted average (TLV-TWA) for 2,6-di-tert-butyl-p-cresol is 2mg/mL... 

Antioxidant additives DBPC = 2,6-di-tert-butyl-p-cresol, B = alkyl-diphenyl amine Extreme-pressure additives DBDS = dibenzyl disulfide (C6H5-CH2-S-S-CH2-C6H5 ), DPDS = diphenyl disulfide (C6H5-S-S-C6H5) ... 

In contrast to the above, Figure 21 shows that the antioxidant did not inhibit the rate of either discoloration or carbonyl formation under mercury-arc exposure. Grassie and Weir (5) also reported that under 2537-A. irradiation the antioxidant, 2,6-di-tert-butyl-p-cresol, had no effect on the rate of polystyrene photooxidation. It may be concluded,... 

BUTYLATED H T)ROXYTOLUENE BUTYLHYDRO-XYTOLUENE CAO 1 CAO 3 CATALIN CAO-3 CHEMANOX 11 DBMP DBPC (technical grade) DIBUTYLATED HYDROXYTOLUENE 2,6-DI-tert-BUTYL-p-CRESOL (OSHA, ACGIH) 2,6-DI-tert-BUTYL-1-HYDROXY-4-METHYLBENZENE 3,5-DI-tert-BUTYL-4-HYDROXYTOLUENE 2,6-DI-terc,BUTYL-p-KRESOL (CZECH) 2,6-DI-tert-BUTYL-p-METHYLPHENOL 2,6-DI-tert-BUTYL-4-METHYLPHENOL FEMANo. 2184 4-HYDROXY-3,5-DI-tert-BUTYLTOLUENE IMPRUVOL... 

DI-tert-BUTYL-p-CRESOL (OSHA, ACGIH) see BFW750... 

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