Pezacki JP, Loncke PG, Ross JP, Warkentin J, Gadosy TA. Silicon migration from oxygen to carbon and decarbonylation in methoxytriphenylsiloxycarbene.
Org Lett 2000;
2:2733-6. [PMID:
10964352 DOI:
10.1021/ol006117+]
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Abstract
[reaction: see text] Thermolysis of 2-methoxy-2-triphenylsiloxy-5,5-dimethyl-Delta(3)-1,3, 4-oxadiazoline affords methyl triphenylsilylformate and methyl triphenylsilyl ether via methoxytriphenylsiloxycarbene. Kinetics show that the carbene undergoes reversible 1,2-triphenylsilyl migration (Brook rearrangement) as well as irreversible decarbonylation. Computed transition states and activation energies (B3LYP/6-31+G) suggest that the migration of the silyl group from oxygen to carbon occurs through an "in plane" transition state with the carbene lone pair forming a new bond to silicon. Decarbonylation involves a four-membered ring, achieved by nucleophilic attack of the oxygen atom of the methoxy group at silicon.
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