a comparative study between antimicrobial toothpastes of pooneh, nasim and crest complete on microbial plaque con-trol dr. r. mofid* - dr. a.r. fathiye** - dr. k. alavi***- dr. m. zamiri**** * - assistant professor of periodontics dept. - faculty of dentistry – shaheed beheshti university of medical sciences. **- associate professor of periodontics dept. - faculty of dentistry – shaheed behesht...

Conformational isomerism of a ball-shaped cyclophane of cyclen was studied using NMR and computational methods with the most notable conformer containing a highly symmetric cyclic benzene tetramer.

Zirconacyclopropenylboronates can be stabilized to dimerization by complexation with tributylphosphine; the phosphine stabilized zirconacycle boronates react with aliphatic and aromatic ketones and aldehydes at C2 of the triple bond to give the previously unknown 3-hydroxyvinylboronates in 61-80% isolated yields.

Treatment of 1-(2-bromoarylmethyl)-3,4-dihydroisoquinolines with oxalyl chloride and triethylamine gave 1-(2-bromophenyl)-5,6-dihydropyrrolo[2,1-a]isoquinoline-2,3-dione derivatives, for example, 1-(2-bromophenyl)-5,6-dihydro-8,9-dimethoxypyrrolo[2,1-a]isoquinoline-2,3-dione. Radical cyclisation of these derivatives with tributyltin hydride and 1,1-azobis(cyclohexanecarbonitrile) afforded telis...

Thirteen difluoromethyl-containing pseudopeptides were synthesized by Ugi reaction using the novel building block 2,2-difluoro-2-(phenylthio)acetic acid (2) as one component, followed by removal of the phenylsulfanyl protecting group in the presence of tributyltin hydride and azobisisobutyronitrile.

The first total synthesis of clavaminol A and C, (2R,3S)-2-amino-3-alkanols from the Mediterranean ascidian Clavelina phlegraea has been achieved in 29% overall yield. The key step involved a palladium(II)-catalysed directed Overman rearrangement to create the C-N bond and install the erythro configuration while a one-pot, tributyltin hydride-mediated reduction allowed simultaneous formation of...

Tinnitus Research Initiative is dedicated to fi nd a cure for Tinnitus. In this context, we are delighted to present you this fi rst issue of the TRI NEWSLETTER. We hope that this newsletter, will facilitate collaboration and knowledge sharing between supported institutions and interest new stakeholders in order to develop our common network. We would like this newsletter to provide relevant ne...

A covalently triggered fluorescence turn-on detection scheme has been implemented for a tris(N-salicylideneamine)-derived dynamic fluorophore. Selective cleavage of strategically placed Si-O bonds by fluoride ion induces spring-loaded conformational transitions that are tightly coupled to fluorescence enhancement.

We have developed a three level implicit method for solution of the Helmholtz equation. Using the cubic spline in space and finite difference in time directions. The approach has been modied to drive Numerov type nite difference method. The method yield the tri-diagonal linear system of algebraic equations which can be solved by using a tri-diagonal solver. Stability and error estimation of the...