Novel rearrangement and cyclization processes resulting from bromination of 1,1-dibenzyltetralin derivatives
摘要:
Addition of bromine to hydrocarbon 1 results in an aromatic alkylation to form the bicyclo[3.3.1]nonane derivative 5. Addition of bromine to ketone 3 in acetonitrile solution results in a dienone-phenol rearrangement to form phenol 6, while reaction of ketone 4 with phosphorus pentabromide yields phenols 10 and 11. This reaction results from a novel ''bromo ketone-phenol'' rearrangement, as demonstrated by the fact that bromo ketones 12 and 13 spontaneously isomerize to 10 and 11.
Novel rearrangement and cyclization processes resulting from bromination of 1,1-dibenzyltetralin derivatives
摘要:
Addition of bromine to hydrocarbon 1 results in an aromatic alkylation to form the bicyclo[3.3.1]nonane derivative 5. Addition of bromine to ketone 3 in acetonitrile solution results in a dienone-phenol rearrangement to form phenol 6, while reaction of ketone 4 with phosphorus pentabromide yields phenols 10 and 11. This reaction results from a novel ''bromo ketone-phenol'' rearrangement, as demonstrated by the fact that bromo ketones 12 and 13 spontaneously isomerize to 10 and 11.
C-Alkylation of the acetoacetate anions and of sodium naphthoxide is highly favoured on alumina, while O-alkylation of the acetoacetate anion predominates in tetrahydrofuran in the presence of solidhexamethylphosphorictriamide.
Synthesis, X-ray crystal structure, and solid-state blue fluorescence of dialkylbenzo[b]naphtho[2,1-d]furan-6-one-type fluorophores
作者:Yousuke Ooyama、Haruka Egawa、Toshiki Mamura、Katsuhira Yoshida
DOI:10.1016/j.tet.2008.05.067
日期:2008.7
and in solid state, the fluorescence quantum yields (Φ) are almost the same among 2a–2c (Φsolution=∼0.5 and Φsolid=∼0.4). Interestingly, the fluorophore 2a exhibits strong blue fluorescence emission both in solution and in crystalline state. To elucidate the effects of the dialkyl substituents on solid-state photophysical properties, we performed time-resolved fluorescence spectroscopic measurement
新型固体发射苯并[ b ]萘[2,1 - d ]呋喃-6-型荧光团2a – 2c,具有π平面发色团骨架和位阻二烷基取代基(R =丁基,辛基和苄基) )设计并易于合成。在环己烷和固态下,荧光量子产率(Φ)在2a – 2c之间几乎相同(Φ溶液=〜0.5,Φ固体=〜0.4)。有趣的是,荧光团2a在溶液和结晶状态下均显示出强烈的蓝色荧光发射。为了阐明二烷基取代基对固态光物理性质的影响,我们进行了时间分辨荧光光谱测量,半经验分子轨道计算(AM1和INDO / S)以及X射线晶体学分析。
Highly selective benzylations of β-naphthoxide anion in heterogeneous media
作者:G. Bram、A. Loupy、J. Sansoulet、F. Vaziri-Zand
DOI:10.1016/s0040-4039(01)91111-6
日期:1984.1
Nuclear Alkylation of Salts of Naphthols and Anthranol<sup>1</sup>
作者:DAVID Y. CURTIN、RICHARD C. TUITES、DOUGLAS H. DYBVIG
DOI:10.1021/jo01072a001
日期:1960.2
Influence of phase transfer catalyst structure on selectivity
作者:E. V. Dehmlow
DOI:10.1007/bf00696697
日期:1995.11
A concise review is given of systematic studies concerned with the tuning of regio-, ''frequentio-,'' chemo-, and diastereoselectivity by the structure or type of phase transfer catalyst.