The reaction rates of atomic boron with various epoxides have been measured in a flow tube apparatus. The bimolecular rate constants, in units of cm3 molecule−1 s−1, are: 1,2-epoxypropane (8.6 × 10−11 ), 1,2-epoxybutane (8.8 × 10−11), 1,2,3,4-diepoxybutane (5.5 × 10−11), 1-chloro-2,3-epoxypropane (5.7 × 10−11), and 1,2-epoxy-3,3,3-trichloropropane (1.5 × 10−11).
Novel derivatives of pyrimid-2-one having interesting pharmacological properties are described. The compounds of the invention have been found to be of use in the control of, and in particular in the inhibition of the metaphase of malignant tumours and leukaemias. Processes for the preparation of the novel compounds and pharmaceutical compositions containing them are also described.
Reactions of group V organometalloidal compounds. Part VI. Ring opening of β-propiolactone and of epoxides with dialkylamino(dimethyl)-arsines
作者:Jugo Koketsu、Yoshio Ishii
DOI:10.1039/j39710000002
日期:——
Treatment of β-propiolactone with dialkylamino(dimethyl)arsines at 80° in benzene gave dimethylarsenic 3-dialkylaminopropionates, formed by alkyl–oxygen bond fission. The addition reactions of dialkylamino(dimethyl)arsines with 1,1,1-trichloro-2,3-epoxypropane took place with normal fission of the epoxidering to give 2-dialkylamino-1-trichloromethylethoxy(dimethyl)arsines. Although 1-chloro-2,3-epoxypropane
Trihalogenomethyl compounds of potential therapeutic interest. Part VIII. Synthesis of some epoxides, amides, alcohols, and acetylenic amines
作者:R. E. Bowman、K. D. Brunt、C. E. Harrison、W. R. N. Williamson
DOI:10.1039/j39700000094
日期:——
Syntheses of epoxides and amides of the general structure Cl3[graphic omitted] their hydroxy-derivatives, some acetylenic trichloromethanols, and Mannich derivatives of acetylenic trichloromethanols are described.
Absence of the benzylic effect in nucleophilic ring opening of oxiranes
作者:Jack I. Lynas-Gray、Charles J. M. Stirling
DOI:10.1039/c39840000483
日期:——
In reactions of oxiranes with sulphur nucleophiles under conditions in which kobs. is pH independent, aryloxiranes show none of the expected enhancement of reactivity; conformational restriction of orthogonal substitution accounts for the observations.