1,2-O-Trichloroethylidene acetal group protected 3,5-dieno-1,4-furanose derivatives

The Knoevenagel-Doebner Reaction on 1,2-O-(2,2,2-Trichloroethylidene) Derivatives of D-Gluco- and D-Manno- furanose

“…The hydroxyl and carboxylic acid group protons appeared as singlets at 5.48, 5.55, 5.76 ppm and 12.32, 12.42, 12.50 ppm, respectively. The large coupling constants (15.6 to 16.0 Hz) between 5-H and 6-H prove the formation of the E -isomer [ 33 ].…”

“…A two pot alternative synthesis of similar compounds has been reported previously [ 27 , 31 , 33 ]. Hence, now we report synthesis of α,β -unsaturated furanuronic acid derivatives via a more facile one pot procedure using the Knoevenagel-Doebner reaction approach.…”

“…Compound 4 was purchased from Sigma-Aldrich Corp. and purified via crystallization from boiling methanol. Syntheses of ( R )-1,2- O- (2,2,2-trichloroethylidene)- α -D- xylo -1,4-furanodialdose ( 2 ) from 1 , ( S )-1,2- O- (2,2,2-trichloroethylidene)- α -D- xylo -1,4-furanodialdose ( 5 ) from compound 4 were performed according to the literature via periodate oxidation reaction [ 31 , 33 ]. Compound 7 was synthesized from D-mannose and chloral according to the literature procedure [ 19 ].…”

Properties of Uranium(VI) Adsorption by Methyl 3-O-Acetyl-5,6-dideoxy-(S)-1,2-trichloroethylidene-α-d-xylo-hept-5(E)-eno-1,4-furano-uronate

“…All chemical reagents used in the experiments were of analytical reagent grade, used without further purification, and were purchased from Merck. The synthesis procedure and structural formation of MOADDTCEXHEFU, which is an unsaturated sugar derivative, were reported elsewhere . To use an insoluble form of this material for the adsorption process, this unsaturated molecule was methylated. , This material was stored in a refrigerator.…”

“…The synthesis procedure and structural formation of MOADDTCEXHEFU, which is an unsaturated sugar derivative, were reported elsewhere. 9 To use an insoluble form of this material for the adsorption process, this unsaturated molecule was methylated. 10,11 This material was stored in a refrigerator.…”