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The synthesis of this compound was accomplished with the same sequence of reactions as used to prepare IIIc, except that the starting material (X) is 3-thiophenecarboxaldehyde. The multiple step preparation of the positional isomer IIIc' was complicated, however, in that the Curtius-type rearrangement reaction (Example 4) gave the desired VI intermediate compound in low yield as the major product of this reaction was a sym-triazine by-product which resulted from trimerization of the isocyanate intermediate. Nonetheless, application of the reactions outlined in Scheme 1 resulted in production of the IIIc' product, which was a brown gum and was used without further purification.

1. customThe synthesis of this compound
2. customto prepare IIIc
3. customThe multiple step preparation of the positional isomer IIIc'
4. customhowever, in that the Curtius-type rearrangement reaction (Example 4)