Derivatives Glycol benzoates

Glycol benzoates from ethylene derivatives C C —> C(OBz)C(OBz) Replacement of hydrogen by hydroxyl H —OH... 

The hyperbranched polymer may contain 3,5-dihydroxybenzoic acid derivatives as the monomer. For example, h5rperbranched polyethylene glycols can be produced by heating methyl 3,5-bis-((8 -hydroxy-3, 6 -dioxaoctyl)oxy)benzoate. This is a hydrolyzate of methyl 3,5-bis((8 -(terf-butyldiphenylsiloxy)-3, 6 -dioxaoctyl)oxy)-benzoate produced from l-bromo-8-(ferf-butyldiphenylsiloxy)-3,6-dioxaoctane and methyl-3,5-dihydroxybenzoate, with dibutyltin diacetate in a nitrogen atmosphere, cf.. Figure 3.21. Thus, a hyperbranched polymer, poly[bis(triethylene glycol)benzoate], is synthesized. 

These derivatives are generally liquids and hence are of little value for characterisation the polyhydric alcohols, on the other hand, afford solid benzoates. Thus the benzoates of ethylene glycol, trimethylene glycol and glycerol melt at 73°, 58°, and 76° respectively (see Section 111,136). 

Prevost, C. lodo-silver benzoate and its use in the oxidation of ethylene derivatives into a-glycols. Compt. rend. 1933,196, 1129-1131. 

To determine the ACs of acyclic 1,2-glycols, the CD exciton chirality method has been applied to their dibenzoates or bis(2-anthroates), which show typical bisignate Cotton effects (see Section 9.04.4) as exemplified in Figures 27 and 28.72,73 Acyclic dibenzoates or bis(2-anthroates) can rotate around the bond connecting two benzoate or 2-anthroate chromophores, and therefore the CD sign depends on the conformational equilibrium. From the data of many examples, general rules were derived as shown in Figures 27 and 28. 

Silver benzoate iodine Glycols from ethylene derivatives... 

Additives used in final products Piasticizers acetyl triethyl citrate, di-(2-ethylhexyl) phthal-ate, diethyl phthalate, dimethyl phthalate, dimethyl sebacate, dioctyi sebacate, polyethylene glycol, polypropylene glycol, sulfolane, toluenesulfonamide derivatives, tri-(2-ethylhexyl) phosphate, triacetin, tributyl citrate, triethyl citrate, triphenyl phosphate Antistatics silver-doped vanadium pentoxide, vanadium pentoxide Antiblocking hydrogenated tallow amide, laponite, silica, talc Release magnesium stearate, sodium benzoate Slip silicone oil ... 

Fig. 3.9 Chromatogram of standard organic acids extracted from aqueous solution using DEAE-Sephadex and separated as their ethoxime and trimethysilyl derivatives on 10 per cent OV-101 on HP Chromosorb W (80-100 mesh), using temperature programming from 110°C to 285° C at 4°C min with a 5 min initial isothermal delay. Peak identifications are 1, glyoxylate 2, glycollate 3, pyruvate 4, oxalate 5, methylmalonate 6, benzoate 7, succinate 8, fumarate 9, malate 10, 2-oxoglutarate 11, hippurate 12, citrate 13,4-hydroxyphenylpyruvate 14, undecandioate 15, -tetracosane (standard) 16, n-hexacosane (standard). (Redrawn with modifications from Chalmers and Watts, 1972a)...

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