Epoxides derived from vegetables oils present an alternative to petroleum-derive

Question

Epoxides derived from vegetables oils present an alternative to petroleum-derived epoxides as cross- linking agents, plasticizers, and polymer stabilizers. Which structural fragment of vegetable oils makes them crude materials for the synthesis of epoxides? (A) ester (B) saturated carbon chain (C) glycerol (D) unsaturated carbon chain Which of these reactions displays the best atom economy? Which molecule is the most reactive towards epoxidation? What is the major product of this reaction? Which hydrogen would be abstracted first when mono- brominating with Br_2 and light? (A) H_a (B) H_b (C) H_c (D) H_d Which statement concerning this reaction is true? (A) The product is achiral (B) The product is a racemic mixture. (C) The product is a single enantiomer. (D) The product is chiral, but not formed as a mixture Which sequence produces aldehydes from 2-pentync? (A) H_2/Lindlar's catalyst followed by ozonolysis (B) H_2/Lindlar's catalyst followed by H^+/H_2O (C) H_3/P followed by ozonolysis (D) H_2/Pd followed by MCPBA Which reagent(s) will accomplish this transformation but would not be recommended for use because of hazardous waste issues? (A) 50% H_2SO_4/H_2O (B) OsO_4 followed by NaHSO_4 (C) conc. H_2SO_4 followed by H_2O/heat (D) Hg(OAc)_2/H_2O followed by NaBH_ What is the main product for this reaction?

Explanation / Answer

Ans 55. D . Unsaturated carbon chain

vegetable oils are triglycerides , which are esters of one molecule of glycerol and 3 molecules of fatty acids.

The double bonds present in the fatty chain of vegetable oils act as the reaction site for its chemical modification . These sites can be functionalised by epoxidation .

So the unsaturated carbon chain of the vegetable oils makes them crude material for epoxides .

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