Bridge-Chlorinated Bicyclo[1.1.1]pentane-1,3-dicarboxylic Acids

被引:18
作者
Kaleta, Jiri [1 ,2 ]
Roncevic, Igor [1 ]
Cisarova, Ivana [3 ]
Dracinsky, Martin [1 ]
Solinova, Veronika [1 ]
Kasicka, Vaclav [1 ]
Michl, Josef [1 ,2 ]
机构
[1] Czech Acad Sci, Inst Organ Chem & Biochem, Flemingovo Nam 2, Prague 16610 6, Czech Republic
[2] Univ Colorado, Dept Chem, Boulder, CO 80309 USA
[3] Charles Univ Prague, Fac Sci, Dept Inorgan Chem, Hlavova 2030, Prague 12840 2, Czech Republic
关键词
MOLECULAR ROTORS; SURFACE INCLUSION; CAGE COMPOUNDS; STRAIN; ENERGY; ARRAYS; PAIRS; MOTION; RODS;
D O I
10.1021/acs.joc.8b02780
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Radical chlorination of bicyclo[1.1.1]pentane-1,3-dicarboxylic acid is highly selective, and up to four chlorine atoms can be introduced relatively easily without damage to the strained bicyclic cage. Combined with hydrodechlorination with TMS3SiH, direct chlorination provides access to five of the 15 possible chlorinated diacids. Their configuration has been established by X-ray diffraction. Their pKa values have been measured by capillary electrophoresis and calculated at the B3LYP-D3BJ/6-311+G(d,p)-level. The results are in good agreement and reflect the expected trend, from 2.78 +/- 0.08 and 4.14 +/- 0.10 in the parent to 1.07 +/- 0.03 and 2.31 +/- 0.03 in the tetrachlorinated diacid. Strain energy relative to the parent diacid was calculated for all 15 chlorinated diacids and shows a dramatic increase with successive chlorination, due to nonbonded Cl-Cl repulsions.
引用
收藏
页码:2448 / 2461
页数:14
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