Starch trichloroacetate

Starch esters of either mono-, di-, or trichloroacetic acid can be pre-pared by heating starch with the appropriate acid or by treatment with the acid anhydride and sulfuric acid. Starch triacetates can be chlorinated by phosphorus pentachloride at 135-140 to produce a starch trichloroacetic ester. ... 

Aluminoxanes suppressed side reactions involving hydrogen transfer. They also formed cyclic structures with starch, giving copolymers that were coated with crystalline polyethylene. A catalyst composed of dicyclopentadienylzirconium dichloride and trimethylaluminium permitted polymerization of ethylene on starch in a toluene suspension at 60 °C for 2h.2806 Graft copolymerization of methyl methacrylate onto starch was also performed with an acetylacetone-copper(II) complex in trichloroacetic acid.2807 The grafting yield and efficiency were proportional to the initiator concentration up to 7.0 x 10-3 mole/L. 

Only about 7% of the coagulating enzyme activity is retained in the cheese curd (200) the remaining activity is expelled in the whey. Recently, Dulley (200) observed that cheeses containing normal and double normal amounts of rennet showed very little difference in peptides soluble in dilute trichloroacetic acid after 10 months maturation this suggests that the amount of rennet did not significantly affect proteolytic breakdown of the cheese proteins. Furthermore, Dulley (200) did not observe a significant difference in starch gel electrophoretic patterns of cheese proteins from cheese containing normal and double normal... 

Pb-tetraacetate added portionwise with stirring and cooling below 30° during 15 min. to a soln. of frans-9,10-dihydroxy-l,4,5,8,9,10-hexahydronaphthalene (prepn. s. 182) and trichloroacetic acid in methanol, stirred 4 hrs. at room temp, until Kl/starch paper gives only a slight reaction 1,1,6,6-tetramethoxy-cyclodeca-3,8-diene (startg. m. f. 457). Y 74%. C. A. Grob and P. W. Schiess, Helv. 45, 1546 (1960). 

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