Phenylethynyl Fischer carbene complexes of chromium 1 and tungsten 2 were found to undergo chemoselective, regioselective and rate-enhanced 1,3-dipolar cycloadditions with phenyl N-t-butyl nitrone 3 at room temp. to give 2,3-dihydroisoxazole carbene complexes 4 and 5 in excellent yields.
K. S. Chan, J. Chem. Soc., Perkin Trans. 1, 1991, 2602 DOI: 10.1039/P19910002602
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