… Reaction of alkynylalkoxycarbene metal (Cr, W) complexes with alcohols gives the
corresponding (2-alkoxyalkenyl)alkoxycarbene metal complexes in moderate to good yields.
A high degree of stereoselectivity is found with linear aliphatic … Recently we reported the
reaction of alkynylalkoxycarbene metal (Cr, W) complexes with ethyl diethoxyacrylate and
tetraalkoxyethylene to give, after metal removal, 6-ethoxy-2-pyrones [1] and 3,4-dioxocyclobutenecarboxylate
derivatives [2], respectively. In continuation of this research, we describe here the …