4- cyanophenyl-4 -

Cyanophenyl-4-n-alkylbenzoates (CPnB), 4 -Cyanophenyl-4-n-alkoxybenzoates (CPnOB), and... 

Table 10. Crystal and molecular data of the mesogenic 4 -cyanophenyl-4-n-alkylbenzoates (CPnB), 4 -cyanophenyl-4-n-alkoxybenzoates (CPnOB), and 4 -n-alkoxyphenyl-4-cyanobenzoates (nOPCB)...

Photorearrangement of 4-/>-cyanophenyl-4-phenylcyclohexene (69) took place mainly byp-cyanophenyl migration/67,70,74 The conclusion could then be drawn that the rearranging excited state is not electron deficient at the /3-carbon atom, since one would not expect a cyanophenyl group to migrate to a positive carbon. The/3-carbon was proposed to have odd electron character ... 

Preparation of A-(4-cyanophenyl) 4-[7-(2-piperidylethoxy)quinazolin-4-yl]piperazinyl -carboxamide... 

Table 3.14 Transition temperatures (°C), elastic constants fk/y, k22 kjj, 10 N), dielectric anisotropy ( e), dielectric constant measured perpendicular to the molecular long axis (e ), birefringence ( n), refractive index measured perpendicular to the director (noJ, rotational viscosity (y. Poise) and bulk viscosity (r, Poise) for tr ns-l-(4-cyanophe-nyl)-4-pentylcyclohexane (41), iTSins-l-(4-cyanophenyl)-4-[(E)-pent-l-enyl]cyclohexane (74) andtra.ns-l-(4-cyanophenyl)-4-[(E)-pent-3-enyI]cyclohexane (78) extrapolated to 100% at 22°...

Bozo, E, Boros, S, Kuszmann, J, Synthesis of 4-cyanophenyl 4-azido -deoxy-l,5-dithio-p-D-xylopyranoside, Carbohydr. Res., 302, 149-162, 1997. 

NMR studies it has been observed that the long molecular axis is nearly parallel to the para- x s of the phenyl moiety and hence the first few fragments of the chain attached to the indazole group are not along this axis. This requires that the alkoxy chain attached to the indazole group has at least six carbon atoms to promote liquid crystalline behaviour. The order parameters of 4 -cyanophenyl 4-heptylbenzoate have been obtained by using 2D-NMR spectroscopy.Linear relationships between C-chemical shifts and order parameters have been obtained. Phase behaviour of a mixture of this liquid crystal and its chain-perfluorinated analogue has also been studied. 

Concentrate the solution by rotary evaporation and recrystallize 4-cyanophenyl-4 -(6-propenoyloxyhexanoxy) benzoate from propan-2-ol as fine colourless crystals, 9.0 g (68%). 

Cyanophenyl-4 -(6-propenoyloxyhexanoxy) benzoate, treat as hazardous material... 

Distinct subsections of the molecules comprising liquid crystals have also been observed using the rate of MQC development in a mixture of liquid crystalline materials. Separate MQ signals were observed for effectively isolated spin systems (phenyl rings) and weakly coupled multi-spin clusters (alkyl tails)80 in a mixture of 4-cyanophenyl 4 -butylbenzoate and 4 cyano-phenyl 4 -heptylbenzoate. 

In the presence of methanol as solvent and 1,4-dicyanobenzene as acceptor, photoinduced electron transfer from 1,4-bis(methylene)cyclohexane gives 4-(methoxymethyl)-1 -methylenecyclohexane and 4-(4-cyanophenyl)-4-(methoxy-methyl)-l-methylenecyclohexane which arise by nucleophilic attack of the solvent on the radical cations, followed either by reduction and protonation, or by combination with the radical anion of the electron acceptor.These observations are in accordance with the proposed mechanism of the nucleophile-olefin combination, aromatic substitution (photo-NOCAS) reaction. The same group has also investigated the use of cyanide ion as nucleophile and report that irradiation of a mixture of 1,4-dicyanobenzene in the presence of biphenyl as donor, KCN, and 18-crown-6 gives a mixture of (79) and (80). These workers have also extended the scope of NOCAS to fluoride ion. In particular, use of 2,3-dimethylbut-2-ene and 2-methylbut-2-ene gives 4-cyanophenyl substituted... 

The CF3S03H/SM62 initiating system has also been used to cyclopolymerize ll-[(4 -cyanophenyl-4"-phenoxy)alkyl]undecanyl-3,4-bis(ethenyloxyethoxy)benzoate to form SCLCPs with crown ethers in the polymer backbone, although the polymerization is accompanied by termination [143]. Polymerization of the chiral vinyl ethers shown in Scheme 10 were reported to give only oligomers with DPn = 5 under the same condi-... 

The systems shown in Fig. 8 and 9 display very simple thermotropic behavior, with the same phase sequence observed at all molecular weights. However, Fig. 10 exemplifies systems in which the number and type of mesophases vary as a function of molecular weight. This is simply due to the phases having different dependencies on molecular weight. That is, the slope of the glass transition versus degree of polymerization of poly 6-[(4 -cyanophenyl-4"-... 

Microphase separation does occur at shorter block lengths when the two blocks are highly immiscible, such as with hydrocarbon and fluorocarbon blocks. For example, all of the diblock copolymers of (perfluorooctyl)ethyl vinyl ether and n-[(4 -cyanophenyl-4"-phenoxy)alkyl] vinyl ethers (PRf-PCNVE ) or 2-[(4 -biphe-nyloxy)ethyl]vinyl ether (PRf-PbiPHVE2) listed in Table 16 exhibit the phases characteristic of both of the corresponding homo-... 

The effect of Si02 and Si02-Ti02 surfaces (in the powder form) on the fluorescence and lifetimes of the adsorbed two push-pull stilbenes, , -l-(4-cyanophenyl)-4-(4-N,N-dimethylaminophenyl)-l,3-butadiene and -9-(4-cyanostyryl)-2,3,6,7-tetrahy-dro-lH,5H-pyrido[3,2,l-i,j]-quinoline was observed [56]. The stilbene fluorescence was quenched effectively by mechanism of electron injection from excited stilbene... 

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