SEARCH Articles Figures Tables 2.6- Dimethyl-4/7-pyran 5- -2,2-dimethyl SYNTHESIS Acetylenedicarboxylate Acetylenedicarboxylates Dimethyl acetylenedicarboxylate synthesis Pyran synthesis Pyrans synthesis Pyrans, 3,4-dihydroreaction with dimethyl acetylenedicarboxylate Pyrans, 3,4-dihydroreaction with dimethyl acetylenedicarboxylate dihydrooxacine synthesis Pyrans, 3,4-dihydroreaction with dimethyl acetylenedicarboxylate glycal synthesis