Showing papers by "Bryan M. Gatehouse published in 1987"
TL;DR: The crystal structures of tris (η5-cyclopentadienyl) (pyridine) samarium(III), monoclinic, space group P21/c, a 10.906(4), b 8.636(2), c 17.825(3) A, β 96.38(2)o, Z 4, R 0.035 and R, 0.039 for 2677 'observed' reflections have been determined as discussed by the authors.
Abstract: The crystal structures of tris (η5-cyclopentadienyl) (pyridine) samarium(III), monoclinic, space group P21/c, a 10.906(4), b 8.636(2), c 17.825(3) A, β 96.44(2)o, Z 4, R 0.027 and Rw 0.032 for 3619 'observed' reflections, and tris (η5-cyclopentadienyl)(pyridine)neodymium(III), monoclinic, space group P21 / c, a 14-206(4), b 8.619(2), c 15.190(7) A, β 107.38(2)o, Z 4, R 0.035 and R, 0.039 for 2677 'observed' reflections have been determined. Both compounds have pseudotetrahedral geometry with a coordination number of 10 for the lanthanoid metal but there is a difference in the coordination of pyridine and in unit cell packing between the two structures.
29 citations
TL;DR: In this article, the reaction of N-acyl isatide with dimethylmalonyl dichloride yielded the oxazinoindole (6) rather than the expected product.
Abstract: Reaction of sodium isatide with dimethylmalonyl dichloride yielded the oxazinoindole (6) rather than the expected product (4). The glyoxylamide (8), which served as a precursor to the macrocyclic complex (15), was therefore prepared by a sequence involving compounds (9), (10) and (7). Such a route makes use of the reactivity of N-acyl isatins and the protecting capacity of the benzyloxycarbonyl group. The structure of compound (6) was established by X-ray crystallography.
2 citations
TL;DR: The oxazinoindoletrione (3) and trione (4, 5, 6, 7, 8, 9, 10) were all established by X-ray crystallography.
Abstract: The oxazinoindoletrione (3) underwent reaction with aqueous ammonia in methanol or ethanol to yield the polycyclic methyl or ethyl esters (4) and (5) respectively. Reaction of trione (3) with gaseous ammonia in dry ethanol gave the aminobenzodiazepinone (7). This compound lost ammonia on heating in toluene to give compound (11) and in the presence of methanol or ethanol gave the methyl or ethyl esters (9) and (10) respectively. The structures of compounds (4), (7) and (10) were all established by X-ray crystallography.
2 citations
TL;DR: In this article, the structure of 2-dimethylamino-4-oxo-7,8-diphenyl-4,6-dihydropyrrolo[l,2-a]pyrimidin-6-ylidene)acetamide was determined by X-ray analysis.
Abstract: The structure N-(2-dimethylamino-4-oxo-7,8-diphenyl-4,6-dihydropyrrolo [l,2-a]pyrimidi n-6-yl-idene)acetamide (3) is proposed for a compound derived from the action of ketene on 2-(2-imino- 3,4-diphenyl-2H-pyrrol-5-yl)-1,1,3-trimethylguanidine (1; R1 = R2 = R3 = Me) on the basis of the crystal structure of its hydrolysis product, the oxo-compound 2-dimethylamino-7,8-diphenyl-4,6-dihydropyrrolo[l,2-a]pyrimidine-4,6-dione (4), the structure of which was determined by X-ray analysis. A lower homologue of (3), N-(2-methylamino-4-oxo-7,8-diphenyl-4,6-dihydro- pyrrolo[l,2-a]pyrimidin-6-ylidene)acetamide (2), and some related compounds are described.
1 citations