OBSERVATION AND IODINE OXIDATION OF THE PROTONATED ANIONIC PROPARGYLTUNGSTEN SPECIES FORMED IN THE REACTION OF FISCHER-TYPE CARBENE COMPLEXES WITH ALKYNYLLITHIUMS

Variable-temperature NMR studies of the reaction of anionic propargylt ungsten species with methanol were carried out. On protonation, 1,2-mi gration of the metal group occurred to generate a vinylmetal species, which was stable up to 0 degrees C. Furthermore, iodine oxidation. of the reaction intermediates gave one of several types of oxidized produ cts, depending on the procedure used.