Synthesis and antimicrobial activity of 2,10‐dichloro‐6‐substituted‐4,8‐dinitro‐12H‐dibenzo[d,g][1,3,2]dioxaphosphocin 6‐oxides/sulfides

Novel 2,10‐dichloro‐6‐substituted‐4,8‐dinitro‐12H‐dibenzo[d,g][1,3,2]dioxaphosphocin 6‐oxides ( 4a–h ) were synthesized by reacting 5,5′‐dichloro‐3,3′‐dinitro‐2,2′‐dihydroxydiphenylmethane ( 2 ) with different aryl phosphorodichloridates ( 3a–g ) or bis(2‐chloroethyl)phosphoramidic dichloride ( 3h ) in the presence of triethylamine at 55–60°C, and the compounds 4i–l were prepared by reacting the 2,6,10‐trichloro‐4,8‐dinitro‐12H‐dibenzo[d,g][1,3,2]dioxaphosphocin 6‐sulfide ( 5 ) in situ with substituted phenols and thiophenol 5 was prepared by condensing 2 with thiophosphoryl chloride. IR, ¹H, ¹³C, ³¹P NMR, and mass spectra supported all the proposed structures. Several title compounds exhibited significant activity in the assays against the bacteria Bacillus subtilis and Escherichia coli and fungi Curvularia lunata and Aspergillus niger. © 2001 John Wiley & Sons, Inc. Heteroatom Chem 12:10–15, 2001     

1,3‐Dipolar cycloaddition of dipolar reagents to bis(styryl) sulfones

Sulfonyl bis pyrazolines and isoxazolines were prepared by 1,3‐dipolar cycloaddition of nitrile imines and nitrile oxides to E,E‐bis(styryl) sulfones. © 2002 Wiley Periodicals, Inc. Heteroatom Chem 13:677–682, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.10087     

Nonlinear Luminescence in CdI2 under Pulsed Laser Excitation

Cadmium iodide has been studied from the point of view of nonlinear processes by experiments of optical amplification under two photon excitation. The two photon absorption (2PA) coefficient is determined by nonlinear transmittance technique. By means of two and three photon comparative luminescence measurements carried out using a ruby and neodymium laser, the three photon absorption (3PA) coefficient is determined. The experimental values of the absorption coefficients are compared with the predictions of the existing theories.