The outcome of the solvent-free benzylation of phenol and 4-substituted phenols (such as 4-cresol and 4-chlorophenol) under MW irradiation was found to depend on the absence or presence of the base (K2CO3) and catalyst (triethylbenzylammonium chloride (TEBAC)). Reaction of benzyl halides at 80–120 °C in the presence of K2CO3 and TEBAC resulted in O-alkylation in high (89–96%) chemoselectivities. In
发现在微波辐照下苯酚和4-取代的苯酚(例如4-甲酚和4-氯苯酚)的无溶剂苄化反应的结果取决于是否存在碱(K 2 CO 3)和催化剂(三乙基苄基氯化铵(TEBAC))。在存在K 2 CO 3和TEBAC的情况下,卤化苄在80–120°C的反应导致O-烷基化反应具有较高的化学选择性(89-96%)。在没有TEBAC的情况下,C-烷基化的比例相当大(16-34%)。也从反应混合物中省略了K 2 CO 3,C-烷基化变得占优势。在4-叔的情况下-丁基苯酚,TEBAC的存在促进了C-烷基化。烷基化的选择性可以通过选择适当的条件来微调。
ALKYLATION OF ACTIVE HYDROGEN COMPOUNDS WITH ALLYLIC AND BENZYLIC ALCOHOLS UNDER CoCl<sub>2</sub>CATALYSIS. A USEFUL SYNTHESIS OF GRIFOLIN
作者:J. Marquet、M. Moreno-Mañas
DOI:10.1246/cl.1981.173
日期:1981.2.5
COCl2 is a useful catalyst for the condensation of allylic and benzylic alcohols with active hydrogen compounds. Under these neutral conditions orcinol and farnesol react to afford the antibiotic grifolin.
certain phenylethers are heated at their boiling points, the non-aromatic group migrates from the oxygen to the nucleus. The more important groups which so migrate are allyl, benzyl and tert.- alkyl. If the rearrangement of some of these ethers is effected in a suitable solvent, the migrating group is transferred, in part, to the solvent. Thus by heating a quinoline solution of benzylphenyl ether, benzyl
Ortho-selective Cross Coupling of Dibromophenols and Dibromoanilines with Grignard Reagents in the Presence of Palladium Catalysts Bearing Hydroxylated Oligoarene-type Phosphine
作者:Shunpei Ishikawa、Kei Manabe
DOI:10.1246/cl.2007.1304
日期:2007.11.5
p-Terphenylphosphines with a hydroxy group were used as ligands for palladium in the catalytic cross coupling of dibromophenols and dibromoanilines with Grignard reagents. High ortho-selectivity that cannot be achieved with other phosphine ligands was observed.
OPTICAL FILM, POLARIZING PLATE, AND IMAGE DISPLAY DEVICE
申请人:FUJIFILM Corporation
公开号:US20150323824A1
公开(公告)日:2015-11-12
A film of 15 to 45 μm thick containing a cellulose acylate and an aromatic ester oligomer having a repeating unit derived from a dicarboxylic acid and a repeating unit derived from a diol, in which the repeating unit derived from a dicarboxylic acid has a ratio m/n of from 0/10 to 3/7, m and n represent a molar proportion of a repeating unit derived from an aliphatic dicarboxylic acid and an aromatic dicarboxylic acid, respectively, and the film satisfies |Rth(590)|≦50 nm; has a good appearance and is free of deterioration in display performance when the film with a thin thickness is produced in the form of a roll, achieves a high pencil hardness by imparting a high Knoop hardness to the film, even with a hard coat layer provided, and is free of display unevenness on installing the film in a liquid crystal display device.