Stereochemically non-rigid silanes, germanes, and stannanes. Part 3. Intramolecular rearrangements in silyl-, germyl-, and trimethylstannyl-cyclononatetraenes
作者:Alan Bonny、Stephen R. Stobart
DOI:10.1039/dt9790000786
日期:——
temperatures between –90 and 5 °C compound (3) is fluxional; comparisons with n.m.r. data for SnMe3(C5H5) and SnPh3(C7H7) indicate that successive 1,9 (‘least-motion’) sigmatropic shifts rather than the alternative symmetry-allowed thermal migration (1,5; ‘molecular broad-jump’) are responsible for metallotropic character. In contrast, compounds (1) and (2) are stereochemically rigid on the n.m.r. time scale at
SnBrH 3,GeBrH 3或SnMe 3 Cl与–78至–45°C的环壬酸酯基阴离子反应,可得到9-金属-全-顺式-cyclonona-1,3,5,7-四烯C 9 H 9 Y [Y = SiH 3(1),GeH 3(2)或SnMe 3(3)]的特征在于1 H和13 C nmr光谱。升温至环境温度后,化合物(1)-(3)进行环电闭合,形成同分异构的1-metallo-8,9-dihydroindenes(5)-(7),其ir,质量,1 H和13C nmr光谱参数已被记录。Nmr数据表明,化合物(5)-(7)是外向异构体和内向异构体的混合物,每种情况下前者占主导地位。还获得了顺式-环壬酸酯(4)和8,9-二氢茚(8)的1 H和13 C nmr光谱。在–90至5°C的温度范围内,化合物(3)具有通量;SnMe 3(C 5 H 5)和SnPh 3(C 7 H 7)与nmr数据的比较)表明连续的1
Reactions of cyclononatetraenyl dianion with electrophiles: geometry and conformation of 1,3,6-cyclononatrienes
作者:Thomas S. Cantrell、Andrew C. Allen
DOI:10.1016/s0040-4039(00)98205-4
日期:1985.1
the parent cyclononatetraene dianion gives a mixture of (a) the minor products, 1,3,6-cyclononatriene-5,9- and 5,8-dicarboxylic acids, and (b) the major product, bis(5-carboxy-1,3,6-cyclononatrien-9-yl). In contrast, the 9,9-dimethyl dianion affords almost entirely a mixture of the two monocyclic diacids. Similar results are obtained on trimethylsilylation. Conformations of the products are discussed
Reaction of unsaturated compounds with diazoalkanes. Communication 3. Cyclopropanation of cyclooctatetraene with diazomethane
作者:Yu. V. Tomilov、T. L. Mitenina、A. I. Lutsenko、I. E. Dolgii、S. P. Kolesnikov、O. M. Nefedov
DOI:10.1007/bf00952847
日期:1986.1
Efficient method for the preparation of substituted benzaldehydes by the oxidation of cyclooctatetraene, cycloheptatriene and their derivatives by molecular oxygen in the presence of palladium complexes
作者:G. A. Dzhemileva、V. N. Odinokov、U. M. Dzhemilev
DOI:10.1007/bf00953429
日期:1988.10
Reactions of the Cyclooctatetraenyl Dianion with <i>gem</i>-Dihalides. The Preparation of Derivatives of Bicyclo [6.1.0]nonatriene. Synthesis of the Cyclononatetraenyl Anion