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Deuman, Scott E. Henderson, Craig Conger 2011-05-07T12:32:46Z 2011-05-07T12:32:46Z 10000-01-01 1991 The synthesis of a novel ortho-bridged triarylmethanol, 6-(1,1-dimethylethyl)-12c-hydroxy-4,8-dioxa-4H,8H-dibenzo- (cd,mn) pyren-12(12cH)-one, is described in Part I. The key step involves an intramolecular Friedel-Crafts reaction of a triarylmethyl cation. Some reactions of this methanol derivative are presented as part of an attempted synthesis of a hypervalent (10-C-5) trigonal bipyramidal carbon species. Other approaches to a hypervalent trigonal bipyramidal carbon species from spiro (anthracene-9,1$\sp\prime$-phthalan) derivatives are presented in Part II. The electronic and geometric factors of the ligands in the target hypervalent carbon species are discussed in terms of known ligand-induced stabilization of hypervalent species of higher row main group elements. Stabilization of the hypervalent bond by delocalization of the excess electron density in the three-center, four-electron (3c-4e) bond onto a bidentate $\pi$-acceptor ligand in the equatorial plane of the trigonal bipyramidal 10-C-5 species is emphasized. The synthesis and reactions of the spiro (anthracene-9,1$\sp\prime$-phthalan) precursors is given along with a summary of the attempts to convert these precursors to hypervalent 10-C-5 species. The synthetic value of a mercuration/halogenation reaction for the regiospecific addition of an iodine to an arene is illustrated in the synthesis of one of the precursors, a novel ortho-bridged triarylmethyl trifluoromethylsulfonate. Another example of the mercuration/halogenation reaction of an arene is given in Part III which describes the large scale synthesis of 4-(1,1-dimethylethyl)-2-iodobenzoic acid, the precursor to 1,1,1-tris(acetoxy)-6-(1,1-dimethylethyl)-1,1-dihydro-1,$ 2$-benziodoxol-3(1H)-one. The use of this 12-I-5 triacetoxyperiodinane, which is a derivative of the so-called Dess-Martin Periodinane, as a reagent for the oxidation of primary and secondary alcohols to aldehydes and ketones is also described. The advantages of the tert-butylated triacetoxyperiodinane compared to the unsubstituted Dess-Martin triacetoxyperiodinane are discussed in terms of ease of preparation, increased solubility, and decreased rate of decomposition of the 10-I-4 iodinane oxide precursor at its melting point. Several examples of oxidations of alcohols with 12-I-5 triacetoxyperiodinanes and 10-I-4 iodinane oxides are given, and a possible mechanism for these reactions is discussed. Made available in DSpace on 2011-05-07T12:32:46Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9210835.pdf: 6816710 bytes, checksum: ba2b14be237d18f7baaf4d81aefe97ec (MD5) Previous issue date: 1991 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:42:27Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:18:27-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9210835 (UMI)AAI9210835 http://hdl.handle.net/2142/20222 eng Copyright 1991 Henderson, Craig Conger Chemistry, Organic Synthetic approaches to a hypervalent trigonal bipyramidal carbon species and a versatile reagent for the oxidation of primary and secondary alcohols to aldehydes and ketones text Chemistry Chemistry University of Illinois at Urbana-Champaign Dissertation Ph.D.