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Structure determination of the adducts of 1,3‐Di‐ tert ‐butyl‐ and 1,2,3,4‐Tetraphenyldiazocyclopentadiene with dimethyl acetylenedicarboxylate by carbon‐13 NMR
Author(s) -
Braun Siegmar,
Sturm Volker,
Runzheimer KarlOtto
Publication year - 1988
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19881210530
Subject(s) - chemistry , dimethyl acetylenedicarboxylate , adduct , carbon 13 nmr , medicinal chemistry , acetylenedicarboxylate , stereochemistry , organic chemistry , cycloaddition , catalysis
It is shown by NMR spectroscopic arguments, including twodimensional 13 C INADEQUATE experiments, that the adducts of the diazocyclopentadienes 1a and 1b with dimethyl acetylenedicarboxylate have the 3 H ‐indazole structure 3 and not, as was reported in the case of 1b , the spirononatetraene structure 2 .