P4VPy–CuO nanoparticles were synthesized using ultrasound irradiations. Relevant properties of the synthesized nanoparticles were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Fourier transform infrared spectroscopy. After identification, the prepared reagent was used for the promotion of different types of protection reactions of alcohols, phenols and amines. Easy workup, short reaction times, excellent yields, relatively low cost and reusability of the catalyst are the striking features of the reported methods.
N-dimethylformamide dimethyl acetal (DMF-DMA) for the selective cleavage of ethers via neighboring group participation. Various acid-labile functional groups, including carboxylate, allyl, tert-butyldimethylsilyl (TBS), and tert-butoxycarbonyl (Boc), suffer the conditions intact. The method offers an efficient approach to cleaving catechol monoalkyl ethers and to uncovering phenols from acetal-type protecting
Polymerization of<b><i>t</i></b>-Butyl Vinyl Ether Mediated by an Aluminum Lewis Acid–TrF System and Its Complex Structure–Tacticity Correlation
作者:Masataka Oishi、Hisashi Yamamoto
DOI:10.1246/bcsj.74.1445
日期:2001.8
A variety of aluminum (aryloxide)s were used with triphenylmethyl fluoride (TrF) initiator for the isoselective cationic polymerization of t-butyl vinyl ether. This contribution discusses the relationship between polymer tacticity and counteranion structure, which changed according to the bulkiness, strength and chirality of the Lewis acid combined with TrF so as to make the ionic pair more interactive
Synthesis of Biaryls via Cross-Coupling Reaction of Arylboronic Acids with Aryl Chlorides Catalyzed by NiCl2/Triphenylphosphine Complexes
作者:Kaoru Inada、Norio Miyaura
DOI:10.1016/s0040-4020(00)00814-0
日期:2000.10
The cross-coupling reaction of tolylboronic acids (1.3 equiv.) with chloroarenes in toluene was carried out at 80–100°C in the presence of a NiCl2/PPh3 catalyst (3 mol%) and K3PO4·nH2O (2.6 equiv.). The reaction can be applied to various electron-deficient and -rich chloroarenes and is economical as the industrial process.
在80-100°C的NiCl 2 / PPh 3催化剂(3 mol%)和K 3 PO 4 · n H的存在下,甲苯甲苯甲酸(1.3当量)与氯代芳烃在甲苯中的交叉偶联反应2 O(2.6当量)。该反应可用于各种电子不足和富氯代芳烃,并且作为工业过程是经济的。