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The furan ring in the title compound, C27H20N2O2, adopts a twisted conformation about the sp3sp3 bond. The mol­ecular structure is stabilized by an intra­molecular C—H...O inter­action which generates an S(6) ring motif. The crystal packing is stabilized by N—H...O and C—H...O inter­actions generating centrosymmetric R22(18) and C(6) chain motifs, respectively. A weak C—H...π inter­action is also observed.

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The furan ring in the title compound, C26H18N2O2, is twisted about the C(H)—C(H) bond. The mol­ecular structure is stabilized by an intra­molecular C—H...O inter­action, which generates an S(6) ring motif. The presence of N—H...N hydrogen bonds leads to inversion dimers, which are stabilized in the crystal packing by C—H...O and C—H...π inter­actions, forming layers that stack along the a axis.

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The furan ring in the title compound, C26H17BrN2O2, adopts a twisted envelope conformation. The mol­ecular structure is stabilized by an intra­molecular C—H...O inter­action which generates an S(6) ring motif. The crystal packing is stabilized by N—H...O and C—H...Br inter­actions, generating an R22(16) ring motif and a C(12) linear chain motif, respectively. Weak C—H...π bonding is also observed.

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In the title compound, C29H24N2O2, the hydrofuran ring is twisted with puckering parameters Q = 0.1553 (16) Å and φ = 305.0 (6)°. In the crystal, the graph-set motifs of the inter­action pattern are an R22(16) motif involving dimers through N—H...N hydrogen bonds across centres of inversion and a C(6) motif through C—H...O hydrogen-bond between glide-related mol­ecules. Together, these generate [101] ladder-like chains.
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