Basicity constants for a series of 3,7-diazabicyclo[3.3.1]nonane derivatives in acetonitrile with a variation over 13 orders of magnitude have been determined using a spectrophotometric titration technique. An excellent correlation between basicity and calculated proton affinities obtained at PCM-B3LYP/6-31+G(d)//B3LYP/6-31G(d) level was found. The results are discussed in terms of substituent effects
已使用分光光度滴定技术确定了乙腈中一系列3,7-二氮杂双环[3.3.1]壬烷衍生物的碱性常数,其变化幅度超过13个数量级。发现在PCM-B3LYP / 6-31 + G(d)// B3LYP / 6-31G(d)水平下获得的碱度与计算的质子亲和力之间极好的相关性。根据取代基效应讨论了结果,并将其与15 N NMR化学位移进行了比较。
Stereochemical studies—XVIII
作者:N.S. Zefirov、S.V. Rogozina
DOI:10.1016/s0040-4020(01)97102-9
日期:1974.1
A number of heteroanalogues of bicyclo[3.3.1]nonane containing heteroatoms in 3-, 3,7- and 3,7,9-positions has been synthesized. 1H NMR measurement has shown that the compounds of the types 4,5 and 6 (Y = oxygen) are double-chairs with the “wings” of the molecule flattened. However, a new conformational effect has been found for the sulfur containing compounds of type 5 and 6 (X,Y = sulfur) which show
合成了许多在3-,3,7-和3,7,9-位含有双环[3.3.1]壬烷的杂原子的杂类似物。1个1 H NMR测定表明,类型的化合物4,5和6(Y =氧)是双椅子与“翅膀”的分子平坦化。然而,已经发现对于类型5和6的含硫化合物(X,Y =硫)具有新的构象作用,其显示出明显增加了采用船椅构象的趋势。
ZEFIROV N. S.; ROGOZINA S. V., SB. CTPYKTYPA I SVOJSTVA KRISTALLOV. VYP. 1. VLADIMIR, 1974, 94-99