strong bases (n-BuLi, s-BuLi/TMEDA, n-BuLi/t-BuOK, TMPMgCl·LiCl, and LDA) reduce the N═N bond of the parent azobenzene (Y = H), aromatic H→Li permutation occurs with LTMP when a suitable director of lithiation (Y = OMe, CONEt2, F) is present in the benzene residue of the azo compound. The method allows direct access to new substituted azobenzenes.
Cyclometallation reactions. Part 17. Comparative studies of the manganation and palladation of some substituted azobenzenes
作者:Michael I. Bruce、Brian L. Goodall、F. Gordon A. Stone
DOI:10.1039/dt9780000687
日期:——
(with PdCl2) of several substitutedazobenzenes have demonstrated that these complexes behave as nucleophilic and electrophilic reagents, respectively. Assignment of the isomeric structures of the products is facilitated by 19F n.m.r. spectroscopy using fluoroazobenzenes. Metallation of the 2- and 4-substituted azobenzenes XC6H4N:NPh may give products in which the azobenzene has been metallated either
几种取代的偶氮苯的MnMe(CO)5 }}的化学反应和钯(PdCl 2)的钯反应的比较研究表明,这些络合物分别具有亲核试剂和亲电试剂的作用。使用氟偶氮苯的19 F nmr光谱有助于产物的异构体结构的分配。2-和4-取代的偶氮苯XC 6 H 4 N:NPh的金属化可以得到在Ph环[异构体(a)]或在取代环[异构体(b)]中已经将金属偶氮苯金属化的产物。3-取代的偶氮苯可生成其中Ph环已被金属化的配合物[异构体(a)],或其中两个碳原子上均发生金属化的异构体。在取代环中的偶氮官能团邻位[异构体(b)或(c)]。使用XC 6 H 4 N:NC 6 F 5时,C 6 F 5基团未金属化,并且形成的唯一配合物具有对应于异构体(b)(带有2-或4-取代的化合物)或异构体(b)的结构)和(c)(在3个取代的系列中)。吸电子取代基激活芳香环以[MnMe(CO)5 ]攻击,而供电子取代基激活环以PdCl
Cluster chemistry
作者:Michael I. Bruce、Mark G. Humphrey、Omar bin Shawkataly、Michael R. Snow、Edward R.T. Tiekink
DOI:10.1016/0022-328x(87)87169-3
日期:1987.12
measurements: an Ru3 triangle with a non-bonded Ru…Ru vector is capped on both sides by a μ3-arylimido moiety. Electron transfer-catalysed reactions with isocyanides, tertiary phosphines and phosphites proceed to give CO-substituted products in moderate yields: complexesRu3(μ3- NPh)2(CO)8(L) (L = CNC6H3Me2-2,6 (15), PPh3 (16), P(OMe)3), Ru3(μ3- NPh)2(CO)8}2(μ-(PPh2)2C2) and Ru3(μ3-NPh)2(μ-LL)(CO)7 (LL = dppm
Azoarenes,ArNNAr',与反应的Ru 3(CO)12,得到的Ru 3(μ 3 -NAr)(μ 3 - NAR')(CO)9(AR = PH,中,Ar'=苯基,C 6 H ^ 4 Me-3,C 6 H 4 CF 3 -3,C 6 H 4 F-3(11),C 6 H 4 F-4; Ar = Ar'= C 6 H 4 Me-3);产率中等。作为Ar =氩'=苯基或C 6 H ^ 4 ME-3,单核环金属化的Ru(C 6 H ^ 3 RNNC 6 ħ 4还以低收率获得R-3)2(CO)2(R = H或Me)。的Fe 3(CO)12和偶氮苯得到的Fe 3(μ 3 -NPh)2(CO)9以非常低的产率。的X射线研究11所确认的结构分配的光谱测量的基础上作出的:的Ru 3三角形与一非粘合茹...孺矢量由μ封端的两侧3 -arylimido部分。与异氰化物,叔膦和亚磷酸酯的电子转移催化的反
Spontaneous peeling of tetragonal microcrystals with short pulses of UV-light
申请人:National Guard Health Affairs
公开号:US10179857B1
公开(公告)日:2019-01-15
A method is described for exfoliating a microcrystal of an anthracene derivative by irradiation with short pulses of light having a wavelength of 220-420 nm. The irradiation induces a cis-trans isomerization of the anthracene derivative in a part of the microcrystal, which leads to the separation of an outer layer having a thickness of 200-600 nm. The exfoliated microcrystal may be irradiated again with pulses of light of a same or different wavelength.
A method is described for exfoliating a microcrystal of an anthracene derivative by irradiation with short pulses of light having a wavelength of 220-420 nm. The irradiation induces a cis-trans isomerization of the anthracene derivative in a part of the microcrystal, which leads to the separation of an outer layer having a thickness of 200-600 nm. The exfoliated microcrystal may be irradiated again with pulses of light of a same or different wavelength.