title: Metallo-Wittig chemistry of an alkylidene to form a terminal titanium oxo complex.
abstract: We report the synthesis and structure of a titanium(iv) benzophenone adduct bearing a terminal oxo ligand, (PNP)Ti = O(OTf)(OCPh2) (PNP-= N[2-PiPr2-4-methylphenyl]2) (2). Complex 2 is readily synthesized in 71% yield from the previously reported titanium alkylidene (PNP)Ti[double bond, length as m-dash]CHtBu(OTf) (1) and two equivalents of benzophenone, by extruding the olefin Ph2C[double bond, length as m-dash]CHtBu. Treatment of benzophenone adduct 2 with a bulky aryloxide salt results in formation of (PNP)Ti[double bond, length as m-dash]O(OAr) (3) (OAr-= 2,6-bis(diphenylmethyl)-4-tert-butylphenoxide), concurrent with salt elimination and displacement of the benzophenone. Complexes 2 and 3 were characterized by single-crystal X-ray diffraction and a variety of spectroscopic techniques, including NMR, UV-Vis-NIR spectroscopies, and TD-DFT calculations.
authors.affiliation: Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA. mindiola@sas.upenn.edu.
authors.forename: Douglas P
authors.initials: DP
authors.lastname: Solowey
authors.affiliation: Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA. mindiola@sas.upenn.edu.
authors.forename: Takashi
authors.initials: T
authors.lastname: Kurogi
authors.affiliation: Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA. mindiola@sas.upenn.edu.
authors.forename: Brian C
authors.initials: BC
authors.lastname: Manor
authors.affiliation: Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA. mindiola@sas.upenn.edu.
authors.forename: Patrick J
authors.initials: PJ
authors.lastname: Carroll
authors.affiliation: Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, USA. mindiola@sas.upenn.edu.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Mindiola