Addition of dimesitylsilylene to olefins. A reinvestigation
作者:S. Zhang、P. E. Wagenseller、R. T. Conlin
DOI:10.1021/ja00011a034
日期:1991.5
We have reinvestigated the report that dimesitylsilylene adds nonstereospecifically to cis- and trans-2-butene. Stereospecific addition of dimesitylsylene to cis- and trans-2-pentenes and -4-octenes produced the corresponding siliranes. A photoisomerization pathway is also reported for these siliranes. A probable explanation for the earlier and spurious interpretation is given
Protodesilylation of Arylsilanes by Visible-Light Photocatalysis
作者:Jan H. Kuhlmann、Mustafa Uygur、Olga García Mancheño
DOI:10.1021/acs.orglett.2c00288
日期:2022.3.4
The first visible-light-mediated photocatalytic, metal- and base-free protodesilylation of arylsilanes is presented. The C(sp2)–Si bond cleavage process is catalyzed by a 5 mol % loading of a commercially available acridinium salt upon blue-light irradiation. Two simple approaches have been identified employing either aerobic or hydrogen atom transfer cocatalytic conditions, which enable the efficient
1-dimesitylsiliranes, stable at room temperature over months, have been synthesized from the addition of dimesitylsilylene to 2,3-dimethylbutadiene, 2-methylbutadiene, trans, trans-2,4-hexadiene, cis, cis-2,4-hexadiene, cis, cis-2,4-hexadiene, and cis,-trans-2,4-hexadiene. Addition of dimesitylsilylene to the π bond of the diene was stereospecific as indicated by 29 Si NMR. Secondary photodecomposition of 2-vinylsiliranes
In a ligand-exchange reaction between aryltrimethylsilanes, (ArSiMe3) and halogenboranes, (BX3 or ArBX2), arylhalogenboranes (ArBX2, ArAr'BX or Ar2BX) and halogentrimethylsilane are formed. This transfer of substituted aromatic groups from a silicon to a boron atom is an efficient synthetic pathway for the preparation of the corresponding arylhalogenboranes and diarylhalogenboranes with different aryl
A Novel Type of Nucleophilic Substitution Reactions on Nonactivated Aromatic Compounds and Benzene Itself with Trimethylsiliconide Anions
作者:Al Postigo、Roberto A. Rossi
DOI:10.1021/ol015666s
日期:2001.4.1
[reaction: see text]. The reaction of fluorobenzene with Me3Si- anion (1) in HMPA at room temperature surprisingly affords o- and p-fluorotrimethylsilylbenzenes (substitution of aromatic H for TMS, 76% yield) 7a and 7b and also 14% of trimethylsilylbenzene (2). Benzene itself reacts at 50 degrees C to furnish 4 in 45% yield. Pyridine affords p-trimethylsilylpyridine quantitatively. Mechanistic studies