SEARCH Articles Figures Tables Buttenberg FRITSCH - BUTTENBERG - WIECHELL Acetylene synthesis FRITSCH-BUTTENBERG-WIECHEL FRITSCH-BUTTENBERG-WIECHEL Acetylene FRITSCH-BUTTENBERG-WIECHEL Acetylene Synthesis Fritsch Fritsch-Buttenberg-Wiechell rearrangemen Fritsch-Buttenberg-Wiechell rearrangement Fritsche Rearrangement Fritsch-Buttenberg-Wiechel Rearrangement reactions Fritsch-Buttenberg-Wiechell Wiechell