Structure of thalicmidine
The alkaloid thalicmidine isolated from the roots of Thalictrum minus by S. Yu. Yunusov and N. N. Pmgressov [1] contains three methoxy groups and one hydroxy group (broad band in the IR spectrum at 3200-3500 cm-~). The UV spectrum of thalicmidine has three maxima at 220, 280, and 305 mg (tog e 4.52, 4.12, 4.12), which are characteristic for 2, 3, 5, 6-tetrasubstituted aporphins [2]. Methylation of thalicmidine has given glaucine (Ia) and oxidation has yielded m-hemipinic acid, Consequently, the hydroxy group must occupy position 5 or 6 [3, 4]. Since thalicmidine is not identical with glaueentrine, only position 6 remains possible for the hydroxy group (Ib).
A NEW QUATERNARY APORPHINE FROM FAGARA TINGUASSOIBA HOEHNE
An alkaloid isolated as picrate from Fagaratinguassoiba gives rise on methylation to a derivative of glaucine. It has been shown to be the 6-hydroxy-2,3,5-trimethoxy-N,N-dimethylaporphinium ion.
Enhancement of surface properties on Low Density Polyethylene packaging films using various fluorination routes
Nowadays, packaging market deployment requires an important attention. Influence of treatment with molecular (F2) or atomic (Fradical dot) fluorine on properties of Low Density Polyethylene (LDPE) films was investigated. The films were treated using direct fluorination conditions with F2 or a specific reagent XeF2, which releases atomic fluorine Fradical dot. Changes of LDPE chemical composition were investigated by FTIR and solid state NMR. Surface morphology was studied by several microscopy techniques (SEM and AFM). Finally to further characterize film properties after treatments, surface energy measurements and electron paramagnetic resonance (EPR) analyses were also carried out. An upper fluorinated layer, which contains mainly high amount of single bondCF2single bond, was formed during the direct fluorination conditions (F2). For the process performed with XeF2, specific groups single bondCHFsingle bond were detected not only on the polymer surface but also in the bulk. The final CHF/CF2 ratio depended on the fluorination route. Treatment with Fradical dot (originated from XeF2 decomposition) resulted in single bondCHFsingle bond groups in bulk prevailing formation whereas F2 formed mainly single bondCF2single bond groups. Regardless to the reactive species, radicals (dangling bonds) appeared during the fluorination and reacted with oxygen during the exposition to air after the treatment. Such a process resulted in oxygenated polar groups formation and consequently in the surface energy increase.