A series of complexes of the form TpW(NO)(PMe 3 )(η 2 -arene) (where arene = benzene, anisole, dimethoxybenzene, trifluorotoluene, and naphthalene) are evaluated as practical synthons for the versatile dearomatization agent {TpW(NO)(PMe 3 )}, considering air stability, synthetic scalability, and substitution lability. Large-scale syntheses (9−30 g) are reported for several of these complexes as well as their precursors (TpW(NO)(CO 2 ), TpW(NO)Br 2, and TpW(NO)(PMe 3 )Br), and methods for spectroscopic characterization of composition and stereochemistry for the arene complexes (including J PW correlations) are summarized.
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Welch et al. (2007) studied this question.
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