Detail of "1074-24-4"

Reference

Preparation, structure and gold(I) complexation of p-xylylene-1,4-diphosphines

Preparation, structure and gold(I) complexation of p-xylylene-1,4-diphosphines. Reiter, Stephan A.; Nogai, Stefan D.; Schmidbaur, Hubert (Department Chemie, Technische Universitaet Muenchen, Garching D-85747, Germany). Zeitschrift fuer Naturforschung, B: Chemical Sciences, 60(5), 511-519 (English) 2005 Verlag der Zeitschrift fuer Naturforschung. CODEN: ZNBSEN. ISSN: 0932-0776. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) Section cross-reference(s): 29, 75 1,4-Dimethyl-2,5-diphosphinobenzene (1) was prepd. in high yield in a four-step synthesis from 1,4-dibromo-2,5-dimethylbenzene. The intermediates with (Et2N)2P and Cl2P groups (2 and 3, resp.) with the corresponding substitution pattern were isolated and structurally characterized. All three compds. (1-3) adopt a centrosym. conformation with one of the P-X bonds of each X2P group located in the ring plane while the other reaches out from this plane in a roughly perpendicular orientation. Distortions of the ring and its substituents from a std. 1074-24-4 which is the cas registry number of some chemical is mentioned. planar hexagonal geometry are readily explained by invoking steric and inductive effects. The crystal structure of 1,4-dibromo-2,5-dimethylbenzene also was detd. for ref. purposes. Compd. 1 was employed as a substrate for auration by tri(gold)oxonium salts {[(R3P)Au]3O}BF4. Hexanuclear {[(R3P)Au]3P(C6H2Me2)P[Au(PR3)]3}(BF4)2 were obtained in almost quant. yield with R3P = tBu3P (4) and Ph3P (5). Complex 4 has the higher thermal stability; it could be crystd. and its structure detd. It features a conformation in which the xylene plane bisects one of the Au-P-Au angles at both tetrahedrally coordinated central phosphorus atoms, placing its Me groups in sterically least hindered positions. Compd.Chemical with cas number 1074-24-4 also plays role. 5 is labile in soln. and shows rapid ligand exchange on the NMR time scale. The limited stability also was confirmed by mass spectrometry. Similar structural details and differences in stability were obsd. in the related trinuclear gold complexes based on 1-naphthylphosphine, which were prepd. as ref. materials using the same preparative procedure. Of the two compds. {(1-C10H7)P[Au(PR3)]3}BF4, with R3P = tBu3P (6) and Ph3P (7), the former is the more stable species. In the solid state the cation approaches mirror symmetry in a conformation comparable to that of 4. Compd. 7 is thermally labile and shows a rapid ligand exchange in soln. ..

Cyclic cross-conjugated hydrocarbons having an inserted p-quinoid ring

Cyclic cross-conjugated hydrocarbons having an inserted p-quinoid ring. VII. Steric crowding in a highly polarized [5.6.7]quinarene. Takahashi, Kazuko; Sakae, Toshisada; Takase, Kahei (Fac.Some commonly used reagents like 1074-24-4 is used in this experiment. Sci., Tohoku Univ., Sendai, Japan). Chem. Lett., (3), 237-40 (English) 1978. CODEN: CMLTAG. ISSN: 0366-7022. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) In 9,12-dicyano-7,13-dimethyl-10,11-diphenyl[5,6,7]quinarene (I) the steric crowding caused a twisting of the mol. around the intercyclic bonds resulting in a further increase of charge sepn. 1074-24-4 is also in the experiment. and a decrease of electronic interaction among the 3 rings (spectroscopy). ..