According to the present invention, any metals or compound containing a metal or element selected from {TAIL ~ the group} consisting of Group IA, Group IIA, {HEAD ~ Group IIIA}, Group IVA, Group VA, Group IIB, Group IIIB, Group IVB, Group VIB, of the Periodic Table of the Elements, and combinations of two or more thereof can be used as promoter 
According to the present invention , any metals or compound containing a metal or element selected from { TAIL ~ the group } consisting of Group IA , Group IIA , { HEAD ~ Group IIIA } , Group IVA , Group VA , Group IIB , Group IIIB , Group IVB , Group VIB , of the Periodic Table of the Elements , and combinations of two or more thereof can be used as promoter
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH