[reaction: see text] A general procedure for the synthesis of both 12,6- and 12,8-eudesmanolides has been developed. The key step is the titanocene-catalyzed radical cyclization of accessible epoxygermacrolides. The novel reagent 2,4,6-trimethyl-1-trimethylsilylpyridinium chloride, both compatible with oxiranes and capable of regenerating Cp(2)TiCl(2) from Cp(2)Ti(Cl)H and Cp(2)Ti(Cl)OAc, playe...

© The Executive Management Committee/Blackwell Publishing Ltd. 2004. Published by Blackwell Publishing, 9600 Garsington Road, Oxford, OX4 2DQ UK and 350 Main Street, Malden, MA 02148, USA. Blackwell Publishing Ltd Oxford, UK JTSB ournal for the T eory of Social Behaviour 0021-8308 © The Exec tive Management Committee/Blackwell Publishing Ltd. 2004 2 04 34 1 rigi l A ticl Evolution of Kantian al...

[reaction: see text] A highly diastereoselective anti aldol addition utilizing a variety of N-glycolyloxazolidinethiones has been developed. Enolization of an N-glycolyloxazolidinethione with titanium (IV) chloride and (-)-sparteine followed by addition of an aldehyde activated with additional TiCl(4) resulted in highly anti-selective aldol additions, typically with no observable syn isomers. A...

A new class of cyclopentadiene-bis(oxazoline) compounds and their piano-stool-type organometallic complexes have been prepared as catalysts for hydroamination of aminoalkenes. The two compounds MeC(Ox)2C5H5 (BoCpH; Ox = 4,4-dimethyl-2-oxazoline) and MeC(Ox)2C5Me4H (Bo CpH) are synthesized from C5R4HI (R = H, Me) and MeC(Ox)2Li. These cyclopentadienebis(oxazolines) are converted into ligands tha...

Articles you may be interested in OH radicals distribution in an Ar-H2O atmospheric plasma jet Influence of ambient air on the flowing afterglow of an atmospheric pressure Ar/O2 radiofrequency plasma Investigating the role of hydrogen in silicon deposition using an energy-resolved mass spectrometer and a Langmuir probe in an Ar/H2 radio frequency magnetron discharge Hydrogenated-amorphous carbo...

The reaction of 23-oxotigogenin acetate with TMSOTf in THF afforded the corresponding bisnorcholanic lactone in 60% yield. The analogous reactions carried out in dichloromethane or benzene gave the rearranged products--the isomeric spirostanic ketone (10-15%) and bisfuran (40-42%). Similar products were also obtained upon treatment of 23,24-epoxysapogenins with BF(3). The epoxides treated with ...

© The Executive Management Committee/Blackwell Publishing Ltd. 2005. Published by Blackwell Publishing, 9600 Garsington Road, Oxford, OX4 2DQ UK and 350 Main Street, Malden, MA 02148, USA. Blackwell Publishing, Ltd. Oxford, UK JTSB ournal for the T eory of Social Behaviour 0021-8308 © The Exec tive Management Committee/Blackwell Publishing Ltd. 2005 35 4 rigi l A ticl Acc unts’ Eff ctiv ness Sh...

OBJECTIVE To compare preoperative and postoperative visual outcomes, determine patient's satisfaction, and evaluate visual symptoms after implantable collamer lens (ICL) implantation. METHODS One hundred and twelve patients with myopia between -2.75 and -19.50 diopter had ICL or Toric ICL (TICL) implantation. The implantations were carried out at the Cornea and Refractive Unit, Magrabi Eye Ho...

Transmetallation of 4,4'-bis{(2,6-bis[(dimethylamino)methyl]phenylgold)diphenyl-phosphino}biphenyl (3) with MCl(4) (M = Ti, NbCl, V) in benzene gave the corresponding transition metal pincer complexes (4) and insoluble 4,4'-bis[P-(chloro gold(I))diphenylphosphino]biphenyl (2), which can be quantitatively recovered and recycled. Interestingly, 3 did not react with TiCl(3). However, reaction of 2...

Nano-sized tetragonal BaTiO₃ (BT) particles that are well dispersed in solution are essential for the dielectric layer in multilayer ceramic capacitor technology. A hydrothermal process using TiCl₄ and BaCl₂, as source of Ti and Ba, respectively, or the precursor TiO₂ as seed for the formation of BT, and poly(vinylpyrrolidone) (PVP) as a surfactant, was employed in this study to enhance both th...