Deduce the identity of the following compound from the 1^H NMR data given and IR

Question

Deduce the identity of the following compound from the 1^H NMR data given and IR data. C_6H_8O_4: 6 3.9 (6H, singlet), 6.1 (2H, singlet) (ppm) IR: 3100 cm^-1, 2950 cm^-1, 1735 cm^-1 Why is chromatography a convenient way to analyze the mixture of spinach pigments that were extracted into organic solvent (E4-9)? What is the specific function of the brine wash of the organic spinach extract? (T6-1) compound X has a molecular formula of C_6H_8O_2, and gave two peaks in its 13_C NMR spectrum but just one in its 1^H NMR spectrum (2.5 ppm), IR shows intense absorption peak at 1700 cm^-1 provide a structure for compound X.

Explanation / Answer

8.dimethyl (2E)-but-2-enedioate(not able to upload the struture)

9.Very few compounds exist pure in nature. They must first be extracted and then purified and if not extractable they need to be synthesized. Separation involves the application of chemical principle, properties and techniques to separate specific compounds from mixtures. The mixtures to be extracted may be Homogeneous (having same composition all over the volume) or Heterogeneous (differ in composition) depending on the solvent and the solutes.chromatography is devised on the basis of differential adsorbance of substances on solid adsorbent (silica or alumina) to an extent that depends on the substance polarity and other chemical properties and structural properties. Some compounds adsorb more strongly to the stationary phase than others, as they elute (wash down) the column at a very slow rate. Thus they can be separated on the basis of their elution rate accordingly. This technique is used to separate naturally colored components of leaves such as spinach ( Spinacia oleracea).The dark colour of the spinach is a combination of -carotene and chlorophylls.

A plant pigment is any type of coloured compound produced by a plant. A chemical compound which absorbs visible radiation between 380 nm (Violet) and 760 nm (ruby-red) is considered as a pigment. The energy from these radiations is used by plants during photosynthesis for the production of glucose from CO2 and H2O. Different types of plant pigments exist in nature and include various classes of organic compounds (xanthophyll, carotenoids, lycopene etc). Plant pigments give colour to leaves, flowers and fruits and are also important in controlling photosynthesis, growth and development.

10.Removing suspended water from organic solvents is necessary prior to the concentration of such solvents in rotary evaporators. Otherwise, the suspended water will keep with your compounds/extracts at the end of the concentration of organic solvents, and then removing it will be a very harder task,so we use brine as a medium for the drying of extracted pigments.

11.cyclohexane-1,4-dione (not able to upload the struture).

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