Detail of "1952-38-1"

Reference

Manganese complexes of salicylaldehyde alkanolimines as catalysts for the polymerization of 2,6-disubstituted phenols

Manganese complexes of salicylaldehyde alkanolimines as catalysts for the polymerization of 2,6-disubstituted phenols. Olander, Walter Karl (General Electric Co., USA). Ger. Offen. DE 2756323 29 Jun 1978, 16 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08G065-44. PRIORITY: US 76-753506 21 Dec 1976. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) 2,6-Xylenol is oxidatively coupled to form poly(dimethyl-1,4-phenylene oxide) (I) [24938-67-8] by using title catalysts of general structure I, where R = H, lower alkyl, Ph, halogen, or lower alkoxy, R1 = H, lower alkyl, or Ph, Z = substituted or unsubstituted o-phenylene or alkylene, Z1 = O or N, Z2 = alkyleneoxy, alkylalkyleneoxy, alkyl-o-phenylene, or phenyl-o-phenyleneoxy, and n = 0 or 1. The stability and activity of the catalyst can be increased by adding an amine to the polymn. mixt. Thus, a catalyst soln.Several reagents such as 24938-67-8 is used here. prepd. by mixing 0.0184 mol MnCl2 in MeOH with 41.7 g toluene soln. contg. 0.0184 mol o-HOC6H4CH:NCH2CH2OH [1952-38-1] was added to a stirred mixt. of 0.918 mol 2,6-xylenol, 534 mL toluene, 105 mL MeOH, and 4.5 g (50% aq.) NaOH through which O was passed. Termination of the reaction after 4 h by addn. of aq. HOAc gave I with intrinsic viscosity 0.21 dL/g (CHCl3, 30°).Except for chemicals metioned above, 24938-67-8 is also used. ..

A ferromagnetically coupled tetranuclear pseudo-cubane copper(II) cluster: magnetic and ESR studies

A ferromagnetically coupled tetranuclear pseudo-cubane copper(II) cluster: magnetic and ESR studies. Gu, Wei-Hua; Chen, Xiao-Yan; Yin, Li-Hua; Yu, Ao; Fu, Xue-Qi; Cheng, Peng (Department of Chemistry, Nankai University, Tianjin 300071, Peop. Rep. China). Inorganica Chimica Acta, 357(14), 4085-4090 (English) 2004 Elsevier B.V. CODEN: ICHAA3. ISSN: 0020-1693. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) Section cross-reference(s): 75, 77 A tetranuclear copper(II) complex, [Cu4(NSI)4]×2C2H5OH×2H2O (NSI = N-(hydroxyethyl)salicylideneimine), was synthesized and characterized by x-ray diffraction anal. The compd. crystallizes in the monoclinic system, space group P2(1), a 9.494(3), b 18.687(5), c 13.149(4) ?, b 110.162(5)°, Z = 2, R1 = 0.0482 and wR2 = 0.0978. The crystal structure contains a tetranuclear pseudo-cubane core based on an approx. cubane array of alternating copper and oxygen atoms. Each copper atom resides in a distorted square planar coordination environment with one nitrogen and three oxygen atoms from two NSI ligands. The tetranuclear units are linked in the crystal by O-H×××O hydrogen bonds and weak Cu×××O coordination bonds into a 1-dimensional structure. Variable temp. 819080-85-8 and 1952-38-1 are just another two chemicals used in this study. (5-300 K) magnetic measurements indicate the existence of ferromagnetic interactions among copper atoms. The IR and ESR spectra also were studied. .