Colin T. Bedford

Cytenamide-1,4-dioxane (2/1).

In the crystal structure of the title compound [systematic name: 5H-dibenzo[a,d]cycloheptatriene-5-carboxamide–1,4-dioxane (2/1)], 2C16H13NO·C4H8O2, the cytenamide molecules form a hydrogen-bonded R 2 2(8) dimer. The solvent molecule is located between two adjacent cytenamide dimers and forms N—H⋯O hydrogen bonds with one cytenamide molecule from each dimer.

Cytenamide trifluoro-acetic acid solvate.

Cytenamide forms a 1:1 solvate with trifluoroacetic acid (systematic name: 5H-dibenzo[a,d]cycloheptatriene-5-carboxamide trifluoroacetic acid solvate), C16H13NO·C2HF3O2. The compound crystallizes with one molecule of cytenamide and one of trifluoroacetic acid in the asymmetric unit; these are linked by O—H⋯O and N—H⋯O hydrogen bonds to form an R 2 2(8) motif. The trifluoromethyl group of the solvent molecule displays rotational disorder over two sites, with site-occupancy factors of 0.964 (4) and 0.036 (4).

Bolineol, a novel co-metabolite of strobilurins A, F and G from Bolinea lutea

A mycelial co-metabolite of strobilurin A, F and G from Bolinea lutea, which we have named bolineol, has been characterised for the first time. Bolineol (methyl 2-hydroxymethyl-3-methyl-6-phenyl-3Z,5E-hexadienoate) has a similar carbon skeleton to strobilurin A but differs in oxidation level. Its structure has been deduced from its spectral characteristics and those of its acetate. The known compound strobilurin F-1 (methyl 2-methoxymethylene-3-methyl-6-(3′-hydroxyphenyl)-3Z,5E-hexadienoate) has been detected in this organism for the first time and converted into its acetate, a new compound, the structure of which was assigned from its spectral data.

Cytenamide-formic acid (1/1)

In the crystal structure of the title compound [systematic name: 5H-dibenzo[a,d]cycloheptatriene-5-carboxamide–methanoic acid (1/1)], C16H13NO·CH2O2, the cytenamide and solvent molecules form a hydrogen-bonded R 2 2(8) dimer motif, which is further connected to form a centrosymmetric double-motif arrangement. The asymmetric unit contains two formula units.

Cytenamide–butyric acid (1/1)

Cytenamide forms a 1:1 solvate with butyric acid [systematic name: 5H-dibenzo[a,d]cycloheptatriene-5-carboxamide–butanoic acid (1/1)], C16H13NO·C4H8O2. The title compound crystallizes with one molecule of cytenamide and one of butyric acid in the asymmetric unit; these molecules are linked by N—H⋯O and O—H⋯O hydrogen bonds to form an R 2 2(8) heterodimer motif. Pairs of adjacent motifs are further connected via N—H⋯O interactions to form a discrete centrosymmetric assembly.

Cytenamide acetic acid solvate.

IN THE CRYSTAL STRUCTURE OF THE TITLE COMPOUND (SYSTEMATIC NAME: 5H-dibenzo[a,d]cyclo-hepta-triene-5-carboxamide ethanoic acid solvate), C(16)H(13)NO·C(2)H(4)O(2), the cytenamide and solvent mol-ecules form a hydrogen-bonded R(2) (2)(8) dimer motif, which is further connected to form a centrosymmetric double ring motif arrangement. The cycloheptene ring adopts a boat conformation and the dihedral angle between the least-squares planes through the two aromatic rings is 54.7 (2)°.

Natural acetylenes. Part XLIX. Polyacetylenes from Dahlia scapigera(A. Dietr.) Link and Otto var. scapigera f. scapigera and some Dahlia hybrids

Examination of the above Dahlia species revealed the presence of 8 polyacetylenic compounds of which the C16 ene-diyn-ene alcohol (XXXII) and its acetate were new. In representatives of the main garden varieties 36 poly-MeCH[graphic omitted]CH·[CC]2·CH[graphic omitted]CH·CH(OH)·CH(OH)·CHCH2(XVIII), MeCH[graphic omitted]CH·[CC]2·[CH[graphic omitted]CH]2·CH(OH)·CH2·CH2OH (XXVIII), MeCH[graphic omitted]CH·[CC]2·[CH[graphic omitted]CH]2·[CH2]4·CH2·OH (XXXII), Me[CC]3·[CHCH]2·CH(OH)·[CH2]3·CHCH2(XXXVI), acetylenes were detected, including the new (XVIII), (XXVIII), and (XXXVI) and their acetates. Seasonal variations of the content were noted. The C17 alcohol (XXXVI) and the C16 alcohol (XXXII) were synthesised; the latter and the corresponding C14 compound by novel routes.