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James Elver Johnson Richard Hodzi Susan L. Todd Patrice De Meester Shirley S. C. Chu 《Journal of heterocyclic chemistry》1986,23(5):1423-1426
Alkylation of potassium p-nitrobenzohydroxamate with 1,4-dibromobutane gave 2-(p-nitrobenzoyl)tetrahydro-2H-1,2-oxazine (3). The X-ray crystal structure of 3 has been determined. The crystals are monoclinic, space group P21/n with a = 6.749(1), b = 7.644(1), c = 21.557(2)Å, β = 98.89(1), V = 1098.8(2)Å3 and Z = 4. The structure, which was refined to R = 0.039 using 1340 observed reflections, shows the oxazine and carbonyl oxygen atoms trans to each other. Alkylation of potassium benzohydroxamate with 1,3-dibromobutane gave a mixture of 3-methyl-2-benzoyloxazolidine (4) and 5-methyl-2-benzoyloxazolidine (5). The 1H and 13C nmr spectra of the mixture of 4 and 5 indicates that these cyclic hydroxamates exist predominantly in the s-trans conformation. 相似文献
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James Elver Johnson Mohammad Arfan Richard Hodzi Lyman R. Caswell Susan Rasmussen 《Photochemistry and photobiology》1990,51(2):139-144
Abstract— Photolysis at 254 nm of alkyl benzohydroxamates [C, H, CONHOR: R = CH3 H2 CH3 CH(CH3 )2 , CH2 C6 H5 CH(CH3 )C2 H5 CH(CH3 )- n -C6 H13 ] in acetonitrile or hydrocarbon solvents gives benzamide. These reactions can be sensitized by benzophenone (at ca. 350 nm) and are quenched by cis-piperylene. Racemization occurred when 2-octyl (+)-benzohydroxamate was irradiated in cyclohexane. These results are consistent with a mechanism involving a triplet biradical. Photolysis of phenyl benzohydroxamate [C6 H5 CONHOC6 H5 ] and benzyl N -methylbenzohydroxamate [C6 H5 CON-(CH3 )OCH2 Q6 H5 ] cannot be quenched with ris-piperylene and appear to be singlet reactions. 相似文献
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