A problem in optical isomerism . ,250. 53trakosch,B. 5,256. 6Erunner and „itt, B. 20,1025. 7Bandrowski,3. 17,1181; Li. 8,472. 11- cause of the generally accepted notion of the free rotation of thebenzene rings, mentions only one. Gain and I .is co-workers preparedthe two compounds and found that Strakoschs melted at 275°; Band-rowskis at £53°. The former was shown to he 5,3 dinitrohenzidineand the latter 3,5 dinitrohenzidine. It was supposed that theconfiguration of the nitro-groups when arranged hy Kauflers form-ula prevents free rotation of the rings through some form of sterichindrance. Fur
A problem in optical isomerism . ,250. 53trakosch,B. 5,256. 6Erunner and „itt, B. 20,1025. 7Bandrowski,3. 17,1181; Li. 8,472. 11- cause of the generally accepted notion of the free rotation of thebenzene rings, mentions only one. Gain and I .is co-workers preparedthe two compounds and found that Strakoschs melted at 275°; Band-rowskis at £53°. The former was shown to he 5,3 dinitrohenzidineand the latter 3,5 dinitrohenzidine. It was supposed that theconfiguration of the nitro-groups when arranged hy Kauflers form-ula prevents free rotation of the rings through some form of sterichindrance. Further evidence in support of Kauflers conceptionis the fact that benzidine responds to the reaction for o-diamines(condensation with glyoxal or benzil) showing that the amino-groupsmust he close together. It is seen that in (a) the nitro groups are on opposite sides ofthe rings and therefore much farther apart than in (h) where theyare on the same side of the rings. Hence there is present here aform of geometrical NO
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1917
