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11.23.1.1.1.2 Method 2: From (2-Lithio-1H-pyrrol-1-ylethynyl)lithium and Selenium

DOI: 10.1055/sos-SD-011-01293

Pfeiffer, W.-D.Science of Synthesis, (200211991.

(2-Lithio-1H-pyrrol-1-ylethynyl)lithium (8) reacts with selenium to give pyrrolo[2,1-b]selenazole (9). The starting compound is itself obtained by reacting either 1-ethynyl-1H-pyrrole (6) or 1-(1,2-dichlorovinyl)pyrrole (7) with butyllithium. Similarly, pyrrolo[2,1-b]tellurazole (10) can be prepared from 8 and tellurium (Scheme 3).[‌7‌]

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References


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