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5-Bromo-2,3-dihydro-1H-cyclo-penta-[a]naphthalen-1-one.

ABSTRACT: The title compound, C(13)H(9)BrO, has been synthesized by the intra-molecular Friedel-Crafts reaction of 1-(1-bromo-4-naphth-yl)-3-chloro-propan-1-one. There are two approximately planar [maximum deviations of 0.8 (2) and 0.4 (2) Å in the two mol-ecules] molecules in the asymmetric unit. The dihedral angle between their mean planes is 19.72 (8)°. Weak inter-molecular C-H⋯O hydrogen bonding is present in the crystal structure.

SUBMITTER: Zhang L

PROVIDER: S-EPMC2970092 | biostudies-literature |

REPOSITORIES: biostudies-literature

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2,3-Dihydro-1H-cyclo-penta-[b]naph-tha-len-1-ol.

Project description:In the title compound, C(13)H(12)O, the cyclo-pentene ring fused with the naphthalene group adopts an envelope conformation. The cyclo-pentene torsion angle, with the fusion bond at the centre, has a magnitude of 1.16?(16)°. In the crystal, neigh-bouring mol-ecules are connected through O-H?O hydrogen bonds into an R(4) (4)(8) ring motif. The crystal packing also features weak ?-? stacking inter-actions [centroid-centroid distance = 3.8981?(8)?Å] and C-H?? inter-actions.

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2,3-Dihydro-1H-pyrrolizin-1-one.

Project description:There are two nearly identical mol-ecules in the asymmetric unit of the title compound, C(7)H(7)NO. The mol-ecules are nearly planar (r.m.s. deviations of 0.025 and 0.017?Å) and oriented at a dihedral angle of 28.98?(3)°. The two mol-ecules are linked by a C-H?O hydrogen bond. In the crystal, weak inter-molecular C-H?O hydrogen bonds link the mol-ecules into zigzag chains along the c axis.

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4,5-Dihydro-cyclo-penta-[b]thio-phen-6-one.

Project description:The title compound, C(7)H(6)OS, crystallizes with two similar mol-ecules, 1 and 2, in the asymmetric unit. Both mol-ecules are essentially planar with r.m.s. deviations of 0.0193 and 0.0107?Å for the planes through the nine non-H atoms of mol-ecules 1 and 2, respectively. The thio-phene and 4,5-dihydro-cyclo-penta-dienone rings are inclined at 2.40?(13)° in 1 and 0.64?(13)° in 2. In the crystal structure ?-? [3.6542?(17)?Å] and C-H?? contacts stack the mol-ecules into columns in an inverse fashion along the b axis. An extensive series of C-H?O hydrogen bonds links the columns, generating an extended network structure.

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One-pot synthesis of novel 2,3-dihydro-1H-indazoles.

Project description:A copper(I)-mediated one-pot synthesis of 2,3-dihydro-1H-indazole heterocycles has been developed. This synthetic route provides the desired indazoles in moderate to good yields (55%-72%) which are substantially better than those achievable with an alternative two-step reaction sequence. The reaction is tolerant of functionality on the aromatic ring.

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8-Bromo-1,3-diphenyl-2,3-dihydro-1H-naphtho-[1,2-e][1,3]oxazine.

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