排序方式: 共有92条查询结果,搜索用时 218 毫秒
21.
22.
(+)-樟脑与6-甲基-2-氨甲基吡啶缩合得到一种新的手性双齿配体-1,7,7-三甲基-双环[2.2.1]-2-(6'-甲基-2'-氨甲基)吡啶亚胺(1), 与二价钯生成配合物2, 晶体属P21空间群, 晶胞参数为a=10.641(2), b=10.706(2), c=11.011(2)埃; β=115.63(1)°;V=1131.15(40)埃^3; Z=2, 二价钴与1生成配合物3, 晶体属PI空间群, 晶胞参数为a=7.429(2), b=7.971(3), c=16.304(5)埃; a=80.19(3), β=77.10(2), γ=83.21(2)°; V=924.25(56)埃^3; Z=2。根据晶体数据讨论了分子的结构特征, 并对配合物的红外、紫外和核磁共振谱的变化作了解释。 相似文献
23.
24.
25.
26.
27.
28.
29.
Chiral diphosphite ligands were prepared by the reaction of (1R,5S,6R)-(trans, trans)-spiro[4.4]nonane-1,6-diol with chlorophosphites. The rhodium(Ⅰ) complexes containing these ligands were tested in the asymmetric hydroformylation of styrene and moderate enantioselectivity (up to 49% ee) was obtained. A pair of diastereomers 5a and 5b gave the opposite configuration of the product, which implies that the sense of enantioface selection is mainly dictated by the configuration of the terminal group on the ligand. 相似文献
30.
Homochiral cis,cis-; cis,trans- and trans,trans-spiro[4.4]nonane-1,6-diols were prepared via diastereoselective reduction of enantiomerically pure spiro[4.4]nonane-1,6-dione (1) with the corresponding reducing agents: lithium n-butyldiisobutylaluminium hydride for cis,cis-diol (2) with 88% yield; BH3·THF for cis, trans-diol (3) with 91% yield; LiAlH4 for trans,trans-diol (4) with 15% yield. 相似文献