4-Butoxybenzoic acid

Metabutoxycaine Hydrochloride. 3-Amino-2-butoxybenzoic acid 2-diethylaminwlkyl ester hydrochloride 2-butoxy-3-aminobenzoic acid d-diethylaminoethyl ester hydrochloride p-diethylaminoethyl 2-butoxy-3-aminoben -zoate hydrochloride Primacaine hydrochloride. C H CI -N2Oy mol wt 344.88. C 59.20%, H 8.48%, Cl 10.28%, N 8.12%, O 13.92%. Prepn Brit, pat. 728,527 (1955 to Novo-col Chem.), GA 50, 5750 0956). I... 

CN 4-amino-3-butoxybenzoic acid 2-(diethylamino)ethyl ester... 

A mixture of 4-nitro-2-n-butoxybenzoic acid, anhydrous potassium carbonate and 400 ml of dry toluene was refluxed and stirred under a continuous water separator. When the evolution of water had ceased (3 h), the water separator was removed and there was added diethylaminoethyl chloride. The mixture was then refluxed with stirring for about 20 h, filtered while hot, and the solvent was removed from the filtrate by distilling in vacuo. The residual oil was dissolved in dilute hydrochloric acid, the solution was decolorized with activated carbon and the base was liberated by the addition of excess ammonia. The base was extracted with ethyl acetate, the solution was dried, and the ethyl acetate was removed by distilling in vacuo, yielding 2-diethylaminoethyl 4-nitro-2-n-butoxybenzoate as a pale yellow oil. 

The first nematic guest-host prototype nematic guest-host display device contained a nematic liquid crystal (4-butoxybenzoic acid) and a pleochroic dye (methyl red or indophenol blue) sandwiched between two (Nesa) electrodes dTn 12/im) rubbed uniaxially, but with no additional orientation layer, see Figure 3.14. One polariser was fixed to the front substrate surface with its direction of maximum absorption parallel to the rubbing direction and, therefore, the nematic director. 

The first nematic guest-host prototype nematic GH-LCD reported by Heilme-ier and Zanoni " contained methyl red (157) as the dichroic dye dissolved in 4-butoxybenzoic acid as the nematic liquid crystal host. Other hosts investigated later included 4-methoxycinnamic acid and 4-ethoxy-4-aminoben-zonitrile (28), see Table 3.4. The melting point of these three single components is very high. Therefore, prototype GH-LCDs had to be operated and evaluated at very high temperatures. Thermal decomposition of the mixtures led sequentially to lower contrast, homeotropic orientation due to decomposition products and finally device breakdown. However, these initial experiments were sufficient to demonstrate the feasibility of this display type. 

C11H1403 4-butoxybenzoic acid 1498-96-0 22.07 1.0913 2 22404 C11H160 4-tert-butyl-2-methylphenol 98-27-1 20.00 0.9650 1... 

When these types of cutting fluids are manufactured, they typically will contain an ethanolamine salt or some form of emulsifying agent that is used to get the oil in solution. Many of the best formulations will contain triethanolamine salts because of their excellent ability to address what the chemist is looking for—typically, lubricity and anticorrosion protection. Typical ethanolamine salts of t-butylbenzoic acid, pentylbenzoic acid, hexylbenzoic acid, and p-butoxybenzoic acid have been chosen due to their favorable characteristics from the standpoint of cost, solubility, corrosion resistance, and load ability [3],... 

Table 1. Liquid-crystalline behavior of supramolecular 2 1 hydrogen-bonded complexes derived from 4-butoxybenzoic acid and bipyridines ...

As the H-bonded mesogenic core consists of independent and different molecules, nonstoichiometric mixtures can be prepared from H-bond donor and acceptor compounds [31, 32], Figure 7 shows the phase diagram of 4-butoxybenzoic acid 2 n - A) and frans-l,2-bis(4-pyridyl)ethylene 9, Significant positive deviation is seen for the isotropization temperature. The isotropization temperature becomes the highest at the point where an equimolar amount of H-bond donor and acceptor moieties exists and behaves as one single component. 

Fig. 8. Variable-temperature IR spectra of supramolecular hydrogen-bonded complex 5 (n = 4) consisting of 4-butoxybenzoic acid 2 and bipyridine 4 in the range 1500-1800 cm from 100-180 °C...

Fig. 5 Class B SPs. 10 Schemes for (a) closed low-MW assemblies (b) side-chain polymers and (c) multichain assemblies 11 supermolecule of 4-butoxybenzoic acid and stil-bazole " 12 supermolecule of derivatives of 2.6-diamino-pyridine and uracil 13 poly aery late with hexyloxy benzoic acid side chains H-bonded to stilbazole. " ...

When a liquid crystal is reoriented in an external field the observed intensity of the fluorescence of impurity molecules dissolved in the liquid crystal is changed. For example, if the dye brilliant phosphine is dissolved in the nematic phase of p-n butoxybenzoic acid the intensity of its fluorescence increases by a factor of 3 when a field is applied [178]. The use of a fluorescent probe (stilbene dye) for investigating the kinetics of the Prederiks effect is described in [56]. Fluorescence polarization measurements allow us to obtain information on liquid crystal electronic spectra [179] and order parameter [180]. 

C17H19NO3 A -Phenyl-4-butoxybenzo-hydroxamic acid Extraction-photometric Nb, Ta, Ti 3... 

A stired mixture of 4-nitro-2-hydroxybenzoic acid, anhydrous potassium carbonate and n-butyl benzenesulfonate in xylene was refluxed under a continuous water separator for about 19 h. The insoluble potassium salts were filtered off and washed with hot dry toluene. The combined filtrate and washings were distilled under reduced pressure to remove the solvents, thereby leaving a residual oil which solidified on cooling. The solid yields of greater than 95% of n-butyl 4-nitro-2-n-butoxybenzoate (recrystallized from methanol). 

The n-butyl 4-nitro-2-n-butoxybenzoate obtained was dissolved in 50% aqueous ethanol. To this solution was added 2 - 3 molecular equivalents of sodium carbonate, and the resulting mixture, was stirred under reflux for about 16 h. After the ethanol has been distilled off under reduced pressure, the remaining aqueous solution was diluted with water and made acidic with concentrated hydrochloric acid. The precipitated yellow solid was filtered, washed with water, dried in a vacuum oven at 90°C and recrystallized from ethyl acetate. There was thus obtained a 4-nitro-2-n-butoxy-benzoic acid (95.5% yield), melting point 120.9°-122.8°C (corn). 

---