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1.  Di-tert-butyl 3,5-dimethyl-1H-pyrrole-2,4-dicarboxyl­ate 
In the title mol­ecule, C16H25NO4, the non-H atoms, except for the two tert-butyl groups, are roughly planar (r.m.s. deviation of the non-H atoms = 0.086 Å). In the crystal, mol­ecules are linked into inversion dimers by pairs of N—H⋯O hydrogen bonds, forming R 2 2(10) ring motifs.
doi:10.1107/S1600536812026700
PMCID: PMC3393944  PMID: 22798809
2.  2-tert-Butyl 4-methyl 3,5-dimethyl-1H-pyrrole-2,4-dicarboxyl­ate 
In the title mol­ecule, C13H19NO4, except for two C atoms of the tert-butyl group, the non-H atoms are almost coplanar (r.m.s. deviation = 0.2542 Å). In the crystal, mol­ecules are linked into centrosymmetric dimers by two inter­molecular N—H⋯O hydrogen bonds, forming an R 2 2(10) ring motif.
doi:10.1107/S1600536812020120
PMCID: PMC3379292  PMID: 22719490

Results 1-2 (2)