TUNGSTEN PENTACARBONYL AS A POTENTIAL PROTECTING GROUP FOR SOFT LEWISBASE CENTERS IN ALKYLATION OF MULTIFUNCTIONAL MOLECULES

Reaction of W(CO)(6) or (PhNH(2))W(CO)(5) with the molecules which pos sess both diphenylphosphanyl- and dialkylamino group or nitrogen - con taining heterocyclic ring proceeds selectively through ''soft'' Lewis base groups and can be used for the protection of the groups from alky lation. As a rule, the diphenylphosphanyl group participates in the co -ordination, but in some cases an sp(2)-hybridized nitrogen was shown to be the preferable coordination site. The new synthesized compounds have been characterized by NMR, IR spectroscopy, and elemental analysi s.