2,3-Dimethyl-2,3-diphenylbutane
(Synonyms: 2,3-二甲基-2,3-二苯基丁烷) 目录号 : GC619212,3-Dimethyl-2,3-diphenylbutane 是 Dicumylperoxide (DCP) 的分解产物之一。Diallyl orthophthalate (DAOP) 是 2,3-dimethyl-2,3-diphenylbutane 引发的一种反应性增塑剂,用于改善聚苯醚 (PPO) 的加工。
Cas No.:1889-67-4
Sample solution is provided at 25 µL, 10mM.
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2,3-Dimethyl-2,3-diphenylbutane is one of the decomposition of Dicumylperoxide (DCP). Diallyl orthophthalate (DAOP) is a reactive plasticizer initiated by 2,3-dimethyl-2,3-diphenylbutane for improving polyphenylene oxide (PPO) processing[1][2].
References:
[1]. Di Somma I, et al. Kinetic and chemical characterization of thermal decomposition of dicumylperoxide in cumene. J Hazard Mater. 2011;187(1-3):157-163.
[2]. Wang H, et al. Improved Processing and Properties for Polyphenylene Oxide Modified by Diallyl Orthophthalate Prepolymer. Polymers (Basel). 2019;11(12):2016. Published 2019 Dec 5.
Cas No. | 1889-67-4 | SDF | |
别名 | 2,3-二甲基-2,3-二苯基丁烷 | ||
Canonical SMILES | CC(C)(C1=CC=CC=C1)C(C)(C2=CC=CC=C2)C | ||
分子式 | C18H22 | 分子量 | 238.37 |
溶解度 | 储存条件 | Store at -20°C | |
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1 mg | 5 mg | 10 mg | |
1 mM | 4.1952 mL | 20.9758 mL | 41.9516 mL |
5 mM | 0.839 mL | 4.1952 mL | 8.3903 mL |
10 mM | 0.4195 mL | 2.0976 mL | 4.1952 mL |
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给药剂量 | mg/kg | 动物平均体重 | g | 每只动物给药体积 | ul | 动物数量 | 只 | |||
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% DMSO % % Tween 80 % saline | ||||||||||
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1. 首先保证母液是澄清的;
2.
一定要按照顺序依次将溶剂加入,进行下一步操作之前必须保证上一步操作得到的是澄清的溶液,可采用涡旋、超声或水浴加热等物理方法助溶。
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Substrate free radicals are intermediates in ligninase catalysis
Proc Natl Acad Sci U S A 1986 Jun;83(11):3708-12.PMID:3012530DOI:10.1073/pnas.83.11.3708.
The H2O2-requiring ligninase of the basidiomycete Phanerochaete chrysosporium oxidatively cleaves both lignin and lignin model compounds between C alpha and C beta (C-1 and C-2) of their aliphatic side chains. Previous work has demonstrated a reaction mechanism by which ligninase oxidizes aromatic substrates to their cation radicals, which then undergo side chain cleavage to yield carbon-centered free radicals. These carbon-centered radicals add O2 to give substrate peroxyl radicals that react further to yield the hydroxylated and carbonylated end products usually seen in experiments with ligninase. To investigate this radical mechanism, we have now designed three dimeric lignin models: 1-(3,4-dimethoxyphenyl)-2-phenylethanol (I), 1-(3,4-dimethoxyphenyl)-2-phenylpropanol (II), and 1-(3,4-dimethoxyphenyl)-2-methyl-2-phenylpropanol (III). The following results were obtained when these models were oxidized by ligninase: methyl groups at C beta of the substrate favored C alpha-C beta cleavage versus C alpha oxidation to the ketone. GC/MS and HPLC analysis showed that II gave a radical coupling dimer, 2,3-diphenylbutane, as a major (26% yield) reaction product under anaerobic conditions. The anaerobic oxidation of III yielded 2,3-Dimethyl-2,3-diphenylbutane. Spin-trapping experiments with nitrosobenzene showed that model II oxidation produced alpha-methylbenzyl radicals, whereas model III oxidation gave alpha, alpha-dimethylbenzyl radicals. TLC and iodometric determinations showed that III gave cumene hydroperoxide as a major (21% yield) reaction product in air. These findings demonstrate that carbon-centered and peroxyl radicals at C beta are major products of C alpha-C beta cleavage by ligninase.
Improved Processing and Properties for Polyphenylene Oxide Modified by Diallyl Orthophthalate Prepolymer
Polymers (Basel) 2019 Dec 5;11(12):2016.PMID:31817390DOI:10.3390/polym11122016.
Diallyl orthophthalate (DAOP) prepolymer was investigated as a reactive plasticizer to improve the processability of thermoplastics. The rheology of blends of DAOP prepolymer initiated by 2,3-Dimethyl-2,3-diphenylbutane (DMDPB) and polyphenylene oxide (PPO) was monitored during the curing process, and their thermal properties and morphology in separated phases were also studied. Differential scanning calorimetry (DSC) results showed that the cure degree of the reactively plasticized DAOP prepolymer was reduced with increasing PPO due to the dilution effect. The increasing amount of the DAOP prepolymer led to a gradual decrease in the viscosity of the blends and the rheology behavior was consistent with the chemical gelation of DAOP prepolymer in blends. This indicated that the addition of the DAOP prepolymer effectively improved processability. The phase separation occurring during curing of the blend and the transition from the static to dynamic mode significantly influences the development of the morphology of the blend corresponding to limited evolution of the conversion around the gel point.
Kinetic and chemical characterization of thermal decomposition of dicumylperoxide in cumene
J Hazard Mater 2011 Mar 15;187(1-3):157-63.PMID:21277085DOI:10.1016/j.jhazmat.2011.01.023.
Dicumylperoxide (DCP) is one of the most used peroxides in the polymer industry. It has been reported that its thermal decomposition can result in runaway phenomena and thermal explosions with significant economic losses and injuries to people. In the present paper thermal behaviour of dicumylperoxide in cumene was investigated over the temperature range of 393-433 K under aerated and de-aerated conditions. The results indicated that when oxygen was present, the decomposition rate did not follow a simple pseudo-first order kinetic as previously reported in literature. A satisfactory fit of the experimental data was, in this case, achieved by means of kinetic expression derived under the assumption of an autocatalytic scheme of reaction. The reaction rate was, on the contrary, correctly described by a pseudo-first order kinetic in absence of oxygen. Under both aerated and de-aerated conditions, chemical analysis showed that the decomposition mainly resulted in the formation of acetophenone and dimethylphenylcarbinol with minor occurrence of 2,3-Dimethyl-2,3-diphenylbutane. The formation of methane and ethane was also invariably observed while the appearance of cumylhydroperoxide as a reaction intermediate was detected under only aerated conditions. Therefore, two reaction schemes were proposed to explain system behaviour in the presence of oxygen and after its purging.