2,3-双(4-甲氧基苯基)-2,3-二甲基丁烷 | 32445-98-0

• 分子结构分类: 有机化合物 - 苯丙烷和聚酮 - 二苯乙烯类
• 中文名称: 2,3-双(4-甲氧基苯基)-2,3-二甲基丁烷
• 英文名称: 4,4'-dimethoxybicumene
• 英文别名: Butane, 2,4-dimethyl-2,4-bis(4-methoxyphenyl)-；1-methoxy-4-[3-(4-methoxyphenyl)-2,3-dimethylbutan-2-yl]benzene
• CAS: 32445-98-0
• 化学式: C₂₀H₂₆O₂
• 分子量: 298.425
• InChiKey: WKTKHDLULKOHKW-UHFFFAOYSA-N

物化性质

• 熔点：
  182-184 °C(Solv: methanol (67-56-1))
• 沸点：
  384.6±35.0 °C(Predicted)
• 密度：
  0.999±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  5.8
• 重原子数：
  22
• 可旋转键数：
  5
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.4
• 拓扑面积：
  18.5
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  2,3-双(4-甲氧基苯基)-2,3-二甲基丁烷 在 NaY 作用下， 生成 4-methoxycumyl cation
  参考文献：
  名称：

  Direct Observation of Cumyl Cations in Nonacidic Zeolites. Absolute Lifetime and Reactivity with Coabsorbed Alcohols

  摘要：

  DOI：

  10.1021/ja970690f
• 作为产物：
  描述：

  2-(4-甲氧基苯基)-2-甲基丙酸甲酯 在 吡啶 、 lithium aluminium tetrahydride 、 三氧化硫 、 三乙胺 作用下， 以 二甲基亚砜 、 正戊烷 为溶剂， 生成 2,3-双(4-甲氧基苯基)-2,3-二甲基丁烷
  参考文献：
  名称：

  光化学反应。第63篇[1]。α-芳基醛的光脱羰

  摘要：

  醛的紫外线照射6 - 11在排他地在脱羰基的主要产品脱气的解决方案的结果34，35和37 - 40，以及少量的2,3-二苯基2,3二甲基丁烷36从苯基醛6和7。在三-的存在Ñ -butylstannane，锡烷氢竞速赛的掺入，对具体底物的限制，并在分子内氘转移7 35和11 40。对于苯醛6和苯甲醛，脱羰基的量子产率为Φ〜0.4-1.0。9，和0.02 8.哈米特Φ与共振常数（相关性[R ）为6（X = H，p -CH 3，OCH 3）和（CF 3）中，用ω米+为值元取代的异构体是与拟议的将α-裂解为仅具有中等自由基特征的相关自由基对作为主要的光化学步骤相一致。

  DOI：

  10.1002/hlca.19710540312

文献信息

• Dicyanobenzene sensitized carbon-carbon bond cleavage in methoxybicumenes. Products and mechanistic studies
  作者：Przemyslaw Maslak、William H. Chapman

  DOI：10.1016/s0040-4020(01)88366-6

  日期：1990.1

  Radical cations of p-methoxy-p-X-bicumenes generated by ET to excited-state dicyanobenzene undergo rapid irreversible C-C bond scission giving cumyl cations and radicals. The photoefficiency of the process (Φ = 0.13 for X = MeO, Φ< 0.005 for X = CN) and the fate of the radicals produced depends strongly on substitution.

  由ET生成的对甲氧基-pX-双碳二烯的自由基阳离子到激发态的二氰基苯经历快速不可逆的CC键断裂，产生枯基阳离子和自由基。该过程的光效率（对于X = MeO，Φ= 0.13；对于对于X = CN，Φ<0.005）和产生的自由基的命运在很大程度上取决于取代。
• A heavy-metal-free desulfonylative Giese-type reaction of benzothiazole sulfones under visible-light conditions
  作者：Tetsuya Sengoku、Daichi Ogawa、Haruka Iwama、Toshiyasu Inuzuka、Hidemi Yoda

  DOI：10.1039/d1cc03833h

  日期：——

  A visible-light-induced desulfonylative Giese-type reaction has been developed. Essential to the success is the employment of Hantzsch ester to activate benzothiazole sulfones without any heavy-metal additives. Not only benzylic benzothiazole sulfones but also alkyl ones were viable substrates and reacted with electron-deficient alkenes and a propiol amide.

  已开发出可见光诱导的脱磺酰化 Giese 型反应。成功的关键是使用 Hantzsch 酯在没有任何重金属添加剂的情况下激活苯并噻唑砜。不仅苄基苯并噻唑砜而且烷基砜都是可行的底物，并与缺电子烯烃和丙二醇酰胺反应。
• Lifetimes and UV-visible absorption spectra of benzyl, phenethyl, and cumyl carbocations and corresponding vinyl cations. A laser flash photolysis study
  作者：Frances L Cozens、V M Kanagasabapathy、Robert A McClelland、Steen Steenken

  DOI：10.1139/v99-210

  日期：1999.12.5

  Benzyl (4-MeO, 4-Me, and 4-methoxy-1-naphthylmethyl), phenethyl (4-Me₂N, 4-MeO, 3,4-(MeO)₂, 4-Me, 3-Me, 4-F, 3-MeO, 2,6-Me₂, parent, and 4-methoxy-1-naphthylethyl) and cumyl (4-Me₂N, 4-MeO, 4-Me, parent) cations have been studied by laser flash photolysis (LFP) in 2,2,2-trifluoroethanol (TFE) and 1,1,1,3,3,3-hexafluoroisopropanol (HFIP). In most cases styrene or α-methylstyrene precursors were employed for the phenethyl and cumyl ions, the intermediate being obtained by solvent protonation of the excited state. Benzyl cations were generated by photoheterolysis of trimethylammonium and chloride precursors. While a 4-MeO substituent provides sufficient stabilization to permit observation of cations in TFE, cations with less stabilizing substituents usually require the less nucleophilic HFIP. Even in this solvent, the parent benzyl cation is too short-lived (lifetime <20 ns) to be observed. When generated in HFIP, phenethyl cations can be seen to react with unphotolyzed styrene, giving rise to dimer cations that are observed to grow in as the initial phenethyl cation decays. The dimer cations, in common with the oligomer cations seen in cationic styrene polymerization, have a λ_max 15-20 nm higher than the monomer and react with both solvent and styrene several orders of magnitude more slowly. This stabilization relative to the phenethyl may reflect an interaction with the aryl group present at the gamma-carbon. Cations 4-MeOC₆H₄C⁺(R)-CH₃ (R = Me, Et, i-Pr, t-Bu, cyclopropyl, C₆H₅, 4-MeOC₆H₄) were generated in TFE via the photoprotonation route. The alkyl series shows that steric effects are important in the decay reaction. The cation with R = cyclopropyl is a factor of 1.5 less reactive than the cation where R = phenyl. Several vinyl cations have also been generated by photoprotonation of phenylacetylenes. ArC⁺=CH₂ has a reactivity very similar to that of its analog ArC⁺H-CH₃, the vinyl cation being slightly (factors of 2-5) shorter-lived. For the various series of cations, including vinyl, substituents in the aryl ring have a consistent effect on the λ_max, a shift to higher wavelength relative to hydrogen of 15 nm for 4-Me, 30 nm for 4-MeO, and 50 nm for 4-Me₂N.Key words: photogenerated carbocations, carbocation lifetime, styrene, photoprotonation.

  苯甲基（4-MeO，4-Me和4-甲氧基-1-萘基甲基）、苯乙基（4-Me2N，4-MeO，3,4-(MeO)2，4-Me，3-Me，4-F，3-MeO，2,6-Me2，母体和4-甲氧基-1-萘基乙基）和叔丁基（4-Me2N，4-MeO，4-Me，母体）阳离子在2,2,2-三氟乙醇（TFE）和1,1,1,3,3,3-六氟异丙醇（HFIP）中通过激光闪光光解（LFP）进行了研究。在大多数情况下，苯乙烯或α-甲基苯乙烯前体被用于苯乙基和叔丁基离子，中间体通过溶剂质子化激发态而获得。苯甲基阳离子是通过三甲基铵和氯化物前体的光异裂生成的。虽然4-MeO取代基提供了足够的稳定性以在TFE中观察到阳离子，但具有较少稳定取代基的阳离子通常需要较不亲核的HFIP。即使在这种溶剂中，母体苯甲基阳离子也太短寿命（寿命<20 ns）而无法观察到。在HFIP中生成的苯乙基阳离子可以看到与未经光解的苯乙烯反应，导致观察到的二聚体阳离子在初始苯乙基阳离子衰减时增长。与阳离子苯乙烯聚合中观察到的寡聚体阳离子一样，二聚体阳离子的λmax比单体高15-20 nm，并且与溶剂和苯乙烯反应速度慢几个数量级。相对于苯乙基的这种稳定性可能反映了与伽马碳上存在的芳基的相互作用。在TFE中通过光质子化途径生成了4-MeOC6H4C+(R)-CH3（R = Me，Et，i-Pr，t-Bu，环丙基，C6H5，4-MeOC6H4）阳离子。烷基系列表明立体效应在衰减反应中很重要。当R = 环丙基时，其反应性比R = 苯基的阳离子少1.5倍。还通过对苯乙炔的光质子化生成了几种乙烯阳离子。ArC+=CH2的反应性与其类似物ArC+H-CH3非常相似，乙烯阳离子寿命略短（2-5倍因子）。对于包括乙烯在内的各系列阳离子，芳香环中的取代基对λmax有一致的影响，相对于氢的15 nm的4-Me，30 nm的4-MeO和50 nm的4-Me2N的波长偏移。关键词：光产生的碳正离子，碳正离子寿命，苯乙烯，光质子化。
• Mesolytic Scission of C−C Bonds as a Probe for Photoinduced Electron Transfer Reactions of Quinones
  作者：Przemyslaw Maslak、William H. Chapman

  DOI：10.1021/jo952102r

  日期：1996.1.1

  Photoinduced electron transfer reactions of chlorinated benzoquinones are investigated using bibenzylic donors that undergo rapid fragmentation upon oxidation. The fragmentation rates and the quantum yields are used to probe the dynamics of back-electron transfer (BET) in two types of radical ion pairs. The triplet ion pairs formed by interception of excited state quinones give products with high quantum

  使用联苄供体，研究了氯化苯醌的光诱导电子转移反应，该供体在氧化时会发生快速断裂。碎片率和量子产率用于探测两种类型的自由基离子对中背电子转移（BET）的动力学。通过拦截激发态醌形成的三重态离子对可提供具有高量子产率的产物。由醌和供体之间的电荷转移（CT）配合物辐照形成的单线态离子对进行反应的效率明显降低。与CT辐射相比，第一种方法（三重态猝灭）的优势取决于BET的能量。对于BET相对较小DeltaG（et）的反应，此值较大；对于负DeltaG（bet）较高的反应，此值减小。
• Direct comparison of photoefficiencies of C–C bond scission in radical cations generated by photosensitized electron transfer and by irradiation of charge-transfer complexes
  作者：Przemyslaw Maslak、William H. Chapman

  DOI：10.1039/c39890001809

  日期：——

  Quantum yields for C–C bond scission are at least 50 times larger in radical cations of methoxybicumenes (1˙+) generated by quenching of the p-tetrachlorobenzoquinone (TCBQ) excited state (a process that results in triplet solvent-separated ion pairs) than in those obtained by the irradiation of [TCBQ ⋯(1)] charge-transfer complexes (a reaction that yields singlet contact ion pairs).

  的量子产率的C-C键断裂是在methoxybicumenes的自由基阳离子（至少大50倍1 ˙ +由淬火产生的）p -tetrachlorobenzoquinone（TCBQ）激发态（一个进程的结果在三重溶剂分离的离子对）与通过[TCBQ⋯（1）]辐照得到的电荷转移络合物相比（一种产生单线态接触离子对的反应）。