Detail of "2674-34-2"

Reference

Synthesis of laterally attached side-chain liquid crystalline poly(p-phenylene vinylene) and polyfluorene derivatives for the application of polarized electroluminescence

All Rights Reserved. Several substances are used for example 918778-65-1 and 2674-34-2 which are their cas registry numbers. Synthesis of laterally attached side-chain liquid crystalline poly(p-phenylene vinylene) and polyfluorene derivatives for the application of polarized electroluminescence. Yao, Yung-Hsin; Yang, Sheng-Hsiung; Hsu, Chain-Shu (Department of Applied Chemistry, National Chiao Tung University, Taichung 30010, Peop. Rep. China). Polymer, 47(25), 8297-8308 (English) 2006 Elsevier Ltd. CODEN: POLMAG. ISSN: 0032-3861. DOCUMENT TYPE: Journal CA Section: 35 (Chemistry of Synthetic High Polymers) Section cross-reference(s): 37, 73, 75, 76 Two series of poly(p-phenylene vinylene) and polyfluorene derivs. (PPV1-PPV4 and PF1-PF5) contg. laterally attached penta(p-phenylene) mesogens were synthesized and characterized. These polymers show nematic liq. cryst. behavior. The optical properties of the polymers were investigated by UV-vis absorption and photoluminescence spectrometers and these polymers were fabricated to form the polarized electroluminescent (EL) devices using poly(ethylenedioxythiophene)-poly(styrene sulfonic acid) (PEDOT-PSS) as an alignment layer. In the series of poly(p-phenylene vinylene) derivs., polymer PPV4 offered the best EL device performance. It emitted yellow light at 588 nm at 4 V. The max. brightness was about 1337 cd/m2 at 9 V with a polarized ratio of 2.6. In another series of polyfluorene derivs., PF4 offered the best EL device performance with the polarized ratio of 12.4 and a max. luminescence of 1855 cd/m2. In the case of polarized white light, as a consequence of blending small amt. of PF4 and PF5 with a host polymer PF2, polarized ratio of up to 10.2 and a max. brightness of 2454 cd/m2 have been attained. The aligned films exhibited pronounced polarized ratio, implying that the polymers exhibit potential for linearly polarized LED application. .

Utilization of quinone bisacetal organocopper compounds in the synthesis of isoprenoid systems

Utilization of quinone bisacetal organocopper compounds in the synthesis of isoprenoid systems. Raynolds, Peter W.; Manning, Michael J.; Swenton, John S. (Dep. Chem., Ohio State Univ., Columbus, Ohio, USA). J. Chem. 2674-34-2 is the cas registry number of certain chemical which is used as reagents here. Soc., Chem. Commun., (14), 499-500 (English) 1977. CODEN: JCCCAT. DOCUMENT TYPE: Journal CA Section: 30 (Terpenoids) Section cross-reference(s): 26, 72 Anodic oxidn. of 2-bromo-1,4-dimethoxy-3-methylnaphthalene in MeOH-KOH gave 85% of the bisacetal I (R = OMe, R1 = Br) (II). Sequential treatment of II in THF at 60° with BuLi, Cu2I2-Me2S, and prenyl, geranyl, or phytyl bromide gave, after hydrolysis, 92% vitamin K2(5) (I; R2 = O, R1 = CH2CH:CMe2), 96% menaquinone-2 [I; R2 = O, R1 = CH2CH:CMe(CH2)2CH:CMe2], and 93% vitamin K1 [I; R2 = O, R1 = CH2CH:CMe(CH2CH2CHMe)2(CH2)2CHMe2], resp. Cymopol and its Me ether were prepd. by a similar route.Except for chemicals metioned above, 2674-34-2 is also used. ..