Carbon-13 magnetic resonance of hydroaromatics. II. Conformation of Tetralin and tetrahydroanthracene and their methyl derivatives
作者:Frederick G. Morin、W. James Horton、David M. Grant、Don K. Dalling、Ronald J. Pugmire
DOI:10.1021/ja00350a042
日期:1983.6
Carbon-13 chemical shift data have been acquired for 36 methylated tetralins and tetrahydroanthracenes. A least-squares regression analysis has been undertaken on the ring carbons of compounds of unequivocal conformation to determine methyl substituent parameters for the two distinct aliphatic positions and the results have been used to estimate the position of equilibrium of conformationally mobile
Synthesis and Properties of 1, 1-Dihalogenocycloprop[<i>b</i>]Anthracenes
作者:Paul M¨︁ller、Michel Rey
DOI:10.1002/hlca.19820650405
日期:1982.6.16
The synthesis of 1, 1-difluoro-1H-cycloprop[b]anthracene (3) is described. The key step of the synthesis is the cycloaddition of 1,2-dichloro-3,3-difluorocyclo-propene (6) to 2,3-dimethylidene-1,2,3,4-tetrahydronaphthalene (5). The 13C-NMR. spectrum of 3 is assigned on the grounds of C,F-coupling constants, selective H-decoupling and the resulting residual C,H-coupling. The 1, 1-dichloro derivative
描述了1,1-二氟-1 H-环丙[ b ]蒽(3)的合成。合成的关键步骤是将1,2-二氯-3,3-二氟环丙烯(6)环加成到2,3-二甲基-1,2,3,4-四氢萘(5)上。的13 C-NMR。基于C,F耦合常数,选择性的H型去耦合以及所产生的残留C,H耦合来分配3的光谱。1,1-二氯衍生物4是通过相同的途径合成的,但不能分离得到纯净的。还原为1 H-环丙[ b ]蒽(2)和电离的实验3或4到阳离子16失败。
Enantioselectivity in the reduction of tricyclic hydroaromatic ketones by baker's yeast
Three benzo-2-tetralones were hydrogenated to the corresponding alcohols by non-fermenting baker's yeast. Satisfactory yields but modest enantioselectivities were observed. The prevalent enantioform of the benzo-2-tetralol was found to be in agreement with the predictive abstract model previously proposed for the enzymatic hydrogenation of aromatic ring substituted 2-tetralones.
Direct electrochemical synthesis of quinones from simple aromatics and heteroaromatics
作者:Ling Zhang、Youtian Fu、Lei Yang、Liming Cao、Junjun Yi、Maolin Sun、Ruihua Cheng、Yueyue Ma、Jinxing Ye
DOI:10.1039/d3cc01661g
日期:——
of quinones through direct oxidation of widely accessible arenes and heteroarenes under mild conditions. A variety of quinones and hetero quinones were prepared with moderate to good yields, without the involvement of the pre-functionalized substrates. In addition, this atom economic method also exhibits wide functional group tolerance, including C(sp2)–I bond, ester, aldehyde, and OTf groups. This