Bisphenolate

Bismuth ligands, 2,989-1061 bonding, 2,1030-1041 7i bonding, 2, 1033-1039 trigonal bipyramidal complexes, 2,1036 Bismuth line, 3,294 Bismuthotungstates, 3, 1042 Bismuth pentafluoride, 3, 292 Bismuth tribromide, 3, 291 Bismuth trichloride, 3, 290 Bismuth trifiuoride, 3, 290 Bismuth triiodide, 3,292 Bismuth trioxide, 3,284 2,2 -Bisphenol metal complexes color photography, 6,109 Bis(trimethylene)triamine metal complexes, 2, 49 4,4 -Bi-l, 2,4-triazolyl metal complexes, 2, 89 polymers... 

Bisphenol F based epoxy resins. Instead of reacting bisphenol A with epichlorohydrin to form a liquid resin, a similar reaction can be conducted with bisphenol F (Figure 2.2). Bisphenol F is composed of a mixture of isomers - ortho-ortho, ortho-para and para-para linkages -whereas bisphenol A is composed mainly of para-para linkages. If n is less than about 0.2, the resins are called bisphenol F epoxides. If n is higher they are referred to as epoxy phenol novolac (EPN) resins (Helfad, 1996). 

Bipyridyl, 4-methyl-4 -vinyl-electrochemical polymerization, 25 electropolymerization, 16 2,2 -Bisphenol metal complexes color photography, 109 Blastocladiella emersonii cation transport, 559 sporulation... 

Diastereomeric diphosphites based on homochiral pentane-2,4-diol ligand backbones substituted with bulky 2,2 -bisphenols and bulky, 2,2 -bisnaphtol with different configurations 8-13 have been prepared to study the effect of chiral cooperativity on the asymmetric hydroformylation of styrene (see... 

The supramolecular systems discussed in this section so far composed of a chiral host and an achiral guest, while the ICD approach is also effective for achiral host and chiral guest systems. The achiral 2,2 -bisphenol 11 (Figure 9) takes two energetically equivalent axially chiral conformations that rapidly interconvert to each other. The complex of the CD spectrum of 11 and chiral /rans-l,2-cyclohexadiamine guest 12a, however, showed a broad exciton-type ICD at around 350 and 300 nm due to... 

The introduction of ring strain as an aid to ROP was further supported by the attachment of diols to yield spirocycHc phosphazenes [56]. In these studies, 2,2 -bisphenol, 1,8-dihydroxynaphthalene, 1,8-diaminonaphthalene and catechol were found to readily attach in a geminal fashion (1,1-disubstituted) and, followed by treatment with sodium 2,2,2-trifluoroethoxide to remove remaining halide, yielded a stable trimer material (Figure 4.6). Additional structures formed exhibited 1,3 substitutions of selected bifunctional pendant groups, similar to that of the metal-locenyl derivatives (Figure 4.7). 

Figure C2.1.17. Stress-strain curve measured from plane-strain compression of bisphenol-A polycarbonate at 25 ° C. The sample was loaded to a maximum strain and then rapidly unloaded. After unloading, most of the defonnation remains.

Polycarbonate is a polyester in which dihydric (or polyhydric) phenols are joined through carbonate linkages. The general-purpose type of polycarbonate is based on 2,2-bis(4 -hydroxybenzene)propane (bisphenol A) and has the general structure ... 

DGEBA. See Bisphenol A, diglycidyl ether. Bisphenol A, diglycidyl ether (DGEBA) [1675-54-3]... 

Fig. 23. Representative protecting groups for phenolic and carboxylic acid-based systems, (a) The polymer-based protecting groups are fisted in order of increasing activation energy for acid-catalyzed deprotection, (b) Acid-labile monomeric dissolution inhibitors, a bifunctional system based on protected bisphenol A. (c) Another system that combines the function of dissolution inhibitor and PAG in a single unit.

The para and ortho positions of phenols condense at the carbonyl group of acetone to make bisphenols, eg, bisphenol A, 4,4 -(l-methylethyhdene)bisphenol [80-05-07]). If the H atom is activated, CICH— compounds add to the carbonyl group in the presence of strong base chloroform gives chloretone (l,l,l-trichloro-2-methyl-2-propanol [57-15-8]). 

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