9-Cis 11-cis isomers of 18,18,18-, 19,19,19- and 20,20,20-trifluororetinal

The preparation and properties of the 9-cis and 11-cis isomers of three trifluoromethylated retinals are described.     

Synthesis of(7e,9e,11e,13e)-18,18,18-trifluororetinal (all-trans 5-trifluoromethylretinal)

All-trans-18,18,18-trifluororetinal (2) was synthesized through trifluorocyclocitral (3) as a key intermediate.     

9-氯甲基蒽的实验室制备法

介绍一个在室温条件下反应制备9-氯甲基蒽——构造荧光分子探针的常用中间体的,方法。该实验以9-蒽甲醇和二氯亚砜为原料,苯为溶剂,在吡啶催化下反应,经水洗,干燥,旋转蒸发除去溶剂,最后得到固体产品。推荐该方法作为高校实验室自制9-氯甲基蒽的方法。     

Preparation and Spectroscopic Characterization of (9Z,9′Z)‐Lutein (Neolutein C)

The preparation of pure, crystalline (9Z,9′Z)‐lutein (neolutein C; 2 ) by I₂‐catalyzed photoisomerization of (all‐E)‐lutein ( 1 ) is described. The structure of 2 was unambiguously determined by UV/VIS, CD, and NMR spectroscopy, as well as by mass spectrometry, and the complete assignment of the ¹³C‐NMR spectrum of this carotenoid is presented for the first time.     

Preparation and properties of poly[9-hexadecyl-3-phenyl-6-(4-vinylphenyl)-9H-carbazole]

Preparation of new carbazole-containing polymer, poly[9-hexadecyl-3-phenyl-6-(4-vinylphenyl)-9H-carbazole], is reported. The optical properties of the product have been studied in comparison with those of the starting compounds. Electrochemical properties of the polymer solution and its thin film have been investigated. The polymer film images were obtained by atomic force and scanning tunneling microscopy. Thermogravimetric analysis has shown high thermal stability of the obtained polymer.     

Preparation of 9-vinyl-and 9-ethynyl-o-and m-carboranes

Conclusions The previously unknown 9-vinyl- and 9-ethynyl-o- and m-carboranes were obtained by the reaction of vinyl- and ethynylmagnesium halides with 9-iodo-o- and 9-iodo-m-carboranes, catalyzed by palladium complexes.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 888–892, April, 1985.     

6(5H)-phenanthridinones. II. Preparation of substituted 6(5h)-phenanthridinones from 9-oxofluorenes

A number of 6(5H)-phenanthridinones have been conveniently prepared from 9-oxofluorenes through the Schmidt reaction. It has been found that all amino and nitro 9-oxofluorenes thus far tried gave substituted 6(5H)-phenanthridinones with the amino or nitro group situated in the benzene ring attached to the nitrogen of the lactam group. UV and IR spectral data are presented for these compounds.     

Synthesis of (m-carboran-9-yl)ferrocene and (m-carboran-9-yl)cymantrene

Cross-coupling reactions of 9-iodo-m-carborane with ferrocenylzinc chloride or cymantrenylzinc chloride catalyzed by (Ph₃P)₂PdCl₂ result in the formation of (m-carbo ran-9-yl)ferrocene and (m-carboran-9-yl)cymantrene, respectively. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 542–543, March, 1998.     

Crystal and molecular structures of (9-methylfluoren-9-yl)trimethyltin and (fluoren-9-yl)trimethyltin

Conclusions An increase in the length of the Sn-C (fluorene) bond is not observed in crystals of 9-fluorenyl derivatives of tin, and the variation in the lengths of the Sn-Me bonds is similar to that found in other types of organotin compounds.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2054–2057, September, 1980.     

Preparation of 9-aryl (or heteroaryl)methylidene-10-(methoxyimino)-phenanthrenes and their thermal electrocyclisation to fused quinolines

o-Quinone methanide N-methoxyimines 6a-c, 7a-c, 11a-b and 12a , easily prepared from the reaction of 10-(methoxyimino)phenanthrene-9-one ( 3 ) with phosphonium salts 5a-c, 10a-b in the presence of lithium hydroxide, are thermally converted into dibenzo[f,h]quinolino[2,3-x]fused compounds 9a-c and 13a-b , in high yield.     

Preparation and crystal structures of an ionic triple-hydrogen-bridged derivative of 9-BBN hydroborate zirconium(IV)

An ionic dinuclear triple-hydrogen-bridged 9-BBN hydroborate zirconium complex, [K(Et₂O)₄][{(μ-H)₂BC₈H₁₄}₃Zr(μ-H)₃Zr{(μ-H)₂BC₈H₁₄}₃] (1) was formed from the reaction of Zr{(μ-H)₂BC₈H₁₄}₄ with KH and aniline in diethyl ether. The molecular structure of compound 1 was determined by single-crystal X-ray diffraction analysis. Six 9-BBN hydroborate ligands are coordinated to two Zr atoms via two bridging H atoms, and two Zr atoms are connected by three bridging hydrogens in the anion part of this molecule. The distance of Zr?Zr is 3.1025(5) Å. The crystal structure of 1 suggests that agostic interactions between the zirconium metal center and α-C-H of the 9-BBN hydroborate ligand exist in the solid state. The Zr?H distances corresponding to the α-C-H?Zr agostic interactions are 2.579(4) Å and 2.743(4) Å.