4844-17-1Relevant academic research and scientific papers
Neue Synthesen und Reaktionen ungesaettigter Heterotitanacyclen
Duerr, Stefan,Hoehlein, Udo,Schobert, Rainer
, p. 89 - 96 (2007/10/02)
Dicarbonyltitanocene reacts chemoselectively with difunctional carbonyl compounds such as 1,2-diketones and 1,4-diketo-2-enes, with α-ketothioketones, α-ketoimines and azodicarbonic esters and -amides to yield the corresponding, mostly new, heterotitanacycles that are capable of a lot of a useful follow-up reactions.These chelate complexes, containing three to four heteroatoms, allow the substitution of the entire titanocene fragment by carbon (formation of vinylenic carbonates and the thia-derivatives of these) or by further heteroatoms like boron or phosphorus(formation of boroles and phosphonic acid derivatives), thus retaining the cyclofunctionality.Alternatively, some of the new chelate complexes can be readily C-C-chain-lengthened via a deprotonating/alkylating sequence, leaving the metallacycle unaffected.
Photochemistry of Alkynyl-, Alkenyl-, and Cyclopropyl-Substituted Borate Salts: The Di-π- and Cyclopropyl-π-borate Rearrangements
Kropp, Michael A.,Baillargeon, Michelle,Park, Kyung Mi,Bhamidapaty, Kaumudi,Schuster, Gary B.
, p. 2155 - 2163 (2007/10/02)
The photochemistry of potassium triphenyl(phenylethynyl)borate (1), tetramethylammonium triphenyl(trans-β-styryl)borate (2), and cesium phenyl(2-phenylcyclopropyl)dimethylborate (3) was studied. When irradiated with UV light, these compounds undergo rearrangements to generate potassium 1,1,2,3-tetraphenylboratirene (4), tetramethylammonium trans-1,1,2,3-tetraphenylboratirane (5), and (unisolated) cesium 1,1-dimethyl-2,4-diphenylboratetane (6), respectively. The mechanism of these reactions appears to be similar to the di-π-methane and cyclopropyl-π-methane routes for the analogous hydrocarbons. The effect of borate structure on the efficiency of these reactions was analyzed. Additionally, the chemical and physical properties of the small-ring borates were probed.
Conversion of Benzoin into 9,10-Phenanthrenequinone by Photocyclisation
de Vries, Johannes G.,Hubbard, Sally A.
, p. 1172 - 1173 (2007/10/02)
Benzoin is converted into 9,10-phenanthrenequinone by photocyclisation of its adduct with phenylboric acid, followed by hydrolysis of the photoproduct.
