Influence of phenyl ring substituents in the cyclometallation of Schiff base ligands: crystal and molecular structures of [Pd-{3,4-(OCH2O)C6H2C(H)N(Cy)-C2,N}(μ-O2CMe)]2 and [Pd-{3,4-(OCH2CH2O)C6H2C(H)N(Cy)-C6,N}(μ-O2CMe)]2
作者:Berta Teijido、Alberto Fernández、Margarita López-Torres、Samuel Castro-Juiz、Antonio Suárez、Juan M. Ortigueira、José M. Vila、Jesús J. Fernández
DOI:10.1016/s0022-328x(99)00680-4
日期:2000.3
Reaction of Pd(OAc)2 with the Schiff base ligands 3,4-O(CH2)nO}C6H3C(H)NR (n=1, 2; R=Cy, 3,4-(OCH2O)C6H3CH2-) leads to dinuclear cyclometallated products in which each palladium atom is C,N bonded to a deprotonated organic ligand, and to two acetate groups which bridge both metal centers. Treatment of 3,4-O(CH2)2O}C6H3C(H)NCH2CH2NMe2 with [PtMe2(COD)] gives mononuclear compounds with the ligand
Pd(OAc)2与席夫碱配体3,4- O(CH 2)n O} C 6 H 3 C(H)NR(n = 1,2; R = Cy,3,4- (OCH 2 O)C 6 H 3 CH 2-)生成双核环金属化产物,其中每个钯原子是C,N键合到去质子化的有机配体上,并键接到桥接两个金属中心的两个乙酸酯基团上。的治疗3,4- O(CH 2)2 ö}℃ 6 ħ 3 C(H)NCH 2 CH 2 NME 2与[PTME2(COD)]通过[C,N,N]原子给出了配体为三齿的单核化合物。通过1 H-NMR光谱和X射线衍射研究讨论了环金属化过程的区域选择性。
A Novel Strategy for the Synthesis of Oxygenated Phenanthrenes Involving a Combination of Ullmann and McMurry Reactions
作者:Anne-Elisabeth Gies、Michel Pfeffer
DOI:10.1021/jo982522r
日期:1999.5.1
preparation of polyoxygenated phenanthrenes from substituted derivatives of benzaldehyde is described. The key compound is a 6,6'-biphenyl-1,1'-dicarboxaldehyde intermediate formed through an ambienttemperatureUllmanncoupling. The subsequent McMurry condensation gave rise to the phenanthrene in 45-57% yields.
The invention provides compounds of the general formula (I) ##STR1## and physiologically acceptable acid addition salts, metabolically labile esters and solvates thereof in which R.sup.1 represents a halogen atom or a methyl, ethyl, n-propyl or n-butyl group; R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each represent hydrogen atoms or one or two of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 represent a methy or ethyl group; X represents a C.sub.4-7 alkylene chain optionally substituted by one or more C.sub.1-4 alkyl or hydroxyl groups; or optionally containing one or two double or triple bonds; or optionally interrupted by an oxygen or sulphur atom, or by a sulphone (--SO.sub.2 --) or urea (--NHCONH--) group; and Y represents a phenyl ring optionally carrying one to three substituents selected from hydroxyl, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, amino, carboxamido, C.sub.1-4 alkylsulphonylamino and nitro groups and halogen atoms with the proviso that when X is a C.sub.4-7 alkylene chain optionally containing one double bond then Y cannot represent phenyl or phenyl carrying one substituent which is halogen. The compounds according to the invention decrease total peripheral vascular resistance, increase cardiac output and produce a fall in blood pressure. They may be used in the treatment or prophylaxis of renal insuficiency and cardiovascular disorders such as hypertension, ischaemic heart disease or heart failure, for example acute or congestive heart failure.
Titanium imido complexes utilizing orthometallated derivatized acetophenone and piperonal imine ligands: synthesis, isolation, and characterization
作者:John F. Beck、Tamam I. Baiz、Abdollah Neshat、Joseph A. R. Schmidt
DOI:10.1039/b906461c
日期:——
yielding complexes of the form (L(n))(2)Ti(NR). Several of the resulting complexes [(L(1))(2)Ti(NC(CH(3))(3)), 1a; (L(3))(2)Ti(N-2,6-Me(2)C(6)H(3)), 3b; and (L(5))(2)Ti(NC(CH(3))(3)), 5a] were structurally characterized using small molecule X-ray diffraction. The C(2) symmetric complexes produced in these reactions displayed a distorted square pyramidal geometry. In each complex the titanium center was
通过芳基或烷基苯乙酮亚胺与正丁基锂的反应合成了一系列五个邻位锂化的亚胺(Li-L(n); n = 1-5)。邻位锂化的亚胺随后与Ti(NR)Cl(2)py(3)(R = C(CH(3))(3),2,6-Me(2)C(6)H(3)反应),2,6-Et(2)C(6)H(3)或2,6-(i)Pr(2)C(6)H(3)),生成形式为(L(n ))(2)Ti(NR)。几种所得的配合物[(L(1))(2)Ti(NC(CH(3))(3)),1a; (L(3))(2)Ti(N-2,6-Me(2)C(6)H(3)),3b; 和(L(5))(2)Ti(NC(CH(3))(3)),5a]使用小分子X射线衍射进行结构表征。在这些反应中产生的C(2)对称配合物显示扭曲的方形金字塔形状。在每个络合物中,钛中心位于两个配位的二齿配体的正方形平面上方,并且螯合C的大约N个配体从金属中心折叠开。当使用空间要求较低的烷基亚胺
Muraoka, Motomu; Yamamoto, Tatsuo; Ajimi, Satoru, Journal of the Chemical Society. Perkin transactions I, 1994, # 6, p. 667 - 672