Identification of Compound A from NMR Data

Introduction:

Propionyl chloride is reacted with acetylene gas in the presence of AlCl3 to obtain Compound A. The NMR data of Compound A are given, and it needs to be identified.

Identification of Compound A:

1. Chemical Formula: The chemical formula of Compound A can be determined by the integration values of the NMR spectrum.

2. NMR Data: The NMR data of Compound A are given as follows:

- Chemical Shift (δ): 2.2 ppm (singlet, 3H), 2.7 ppm (triplet, 2H), 3.1 ppm (quartet, 2H), 7.2-7.5 ppm (multiplet, 5H).

- Integration Values: The integration values of the NMR spectrum are given as follows: 3H (singlet), 2H (triplet), 2H (quartet), 5H (multiplet).

3. Interpretation of NMR Data: Based on the NMR data, the following conclusions can be drawn:

- The singlet at 2.2 ppm corresponds to the methyl group (CH3) of the propionyl chloride.

- The triplet at 2.7 ppm corresponds to the two protons (H) of the acetylene gas.

- The quartet at 3.1 ppm corresponds to the two protons (H) of the product formed by the reaction of propionyl chloride and acetylene gas.

- The multiplet at 7.2-7.5 ppm corresponds to the five protons (H) of the aromatic ring formed in the product.

- The integration values indicate that the product formed has a ratio of 3:2:2:5 for CH3, H, H, and aromatic protons.

4. Identification of Compound A: Based on the above conclusions, Compound A can be identified as 3-phenylbut-2-en-1-ol.

Conclusion:

Compound A is identified as 3-phenylbut-2-en-1-ol based on the NMR data and interpretation.